Fix some printing-related bugs, and make the code of the example programs more legible and fix some minor bugs in them
This commit is contained in:
CrazyEttin
parent
17cd71f9ed
commit
c89db6c351
21
emulator.pas
21
emulator.pas
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@ -12,7 +12,7 @@ var
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Addr, IP, RP: word; //Address argument and instruction and return pointers
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Addr, IP, RP: word; //Address argument and instruction and return pointers
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R: array [0 .. 3] of byte; //General-purpose registers
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R: array [0 .. 3] of byte; //General-purpose registers
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Mem: array [0 .. $ffef] of byte; //Memory
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Mem: array [0 .. $ffef] of byte; //Memory
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Prog: file of byte; //Program file
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Prog{$ifdef printer}, Ptr{$endif}: file of byte; //Program file and printer
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Ch: ansichar; //Character for input and output
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Ch: ansichar; //Character for input and output
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begin
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begin
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@ -22,14 +22,6 @@ begin
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IP := 0;
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IP := 0;
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RP := $fff0;
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RP := $fff0;
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//Initialise the printer
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{$ifdef printer}
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AssignLst (Lst, '| lpr');
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rewrite (Lst);
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Ch := ansichar ($d);
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write (Lst, Ch);
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{$endif}
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//Read a program file and check for errors
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//Read a program file and check for errors
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if ParamCount <> 1 then begin
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if ParamCount <> 1 then begin
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writeln ('Usage: emulator program');
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writeln ('Usage: emulator program');
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@ -146,8 +138,10 @@ begin
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//Printer
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//Printer
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{$ifdef printer}
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{$ifdef printer}
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else if Addr = $fffe then begin
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else if Addr = $fffe then begin
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Ch := ansichar (R [X]);
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assign (Ptr, '/dev/usb/lp0');
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write (Lst, Ch);
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rewrite (Ptr);
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write (Ptr, R [X]);
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close (Ptr);
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end
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end
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{$endif}
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{$endif}
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//Regular store
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//Regular store
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@ -214,9 +208,4 @@ begin
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end;
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end;
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//Close the printer
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{$ifdef printer}
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close (Lst);
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{$endif}
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end.
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end.
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@ -17,24 +17,24 @@
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store ffff, r1
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store ffff, r1
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store ffff, r1
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store ffff, r1
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;Get the hexadecimal digit of the high nibble
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;Convert and print the high nibble
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;Convert
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ror r0
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ror r0
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ror r0
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ror r0
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ror r0
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ror r0
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ror r0
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ror r0
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cleq r0, r0, n2hex
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cleq r0, r0, n2hex
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;Print
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;Print the digit
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store ffff, r0
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store ffff, r0
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;Re-load the character to r0
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;Re-load the character to r0
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xor r0, r0
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xor r0, r0
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xor r0, r2
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xor r0, r2
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;Get the hexadecimal digit of the low nibble
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;Convert and print the low nibble
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;Convert
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cleq r0, r0, n2hex
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cleq r0, r0, n2hex
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;Print
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;Print the digit
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store ffff, r0
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store ffff, r0
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;Print a newline
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;Print a newline
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@ -43,6 +43,8 @@
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;Halt
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;Halt
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halt
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halt
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;***
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;Print a newline
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;Print a newline
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newln: load r1, cr
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newln: load r1, cr
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store ffff, r1
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store ffff, r1
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@ -50,79 +52,89 @@ newln: load r1, cr
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store ffff, r1
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store ffff, r1
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ret
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ret
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;***
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;Get the hexadecimal digit of a nibble
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;Get the hexadecimal digit of a nibble
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;Extract the low nibble
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;Extract the low nibble
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n2hex: load r1, mask
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n2hex: load r1, mask
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and r0, r1
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and r0, r1
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;Locate the nibble in the table
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;Locate the nibble in the table
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load r1, tbl00
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load r1, nbl0
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breq r0, r1, dgt0
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breq r0, r1, dgt0
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load r1, tbl02
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load r1, nbl1
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breq r0, r1, dgt1
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breq r0, r1, dgt1
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load r1, tbl04
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load r1, nbl2
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breq r0, r1, dgt2
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breq r0, r1, dgt2
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load r1, tbl06
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load r1, nbl3
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breq r0, r1, dgt3
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breq r0, r1, dgt3
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load r1, tbl08
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load r1, nbl4
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breq r0, r1, dgt4
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breq r0, r1, dgt4
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load r1, tbl0a
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load r1, nbl5
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breq r0, r1, dgt5
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breq r0, r1, dgt5
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load r1, tbl0c
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load r1, nbl6
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breq r0, r1, dgt6
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breq r0, r1, dgt6
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load r1, tbl0e
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load r1, nbl7
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breq r0, r1, dgt7
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breq r0, r1, dgt7
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load r1, tbl10
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load r1, nbl8
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breq r0, r1, dgt8
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breq r0, r1, dgt8
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load r1, tbl12
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load r1, nbl9
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breq r0, r1, dgt9
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breq r0, r1, dgt9
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load r1, tbl14
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load r1, nbla
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breq r0, r1, dgta
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breq r0, r1, dgta
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load r1, tbl16
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load r1, nblb
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breq r0, r1, dgtb
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breq r0, r1, dgtb
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load r1, tbl18
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load r1, nblc
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breq r0, r1, dgtc
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breq r0, r1, dgtc
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load r1, tbl1a
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load r1, nbld
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breq r0, r1, dgtd
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breq r0, r1, dgtd
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load r1, tbl1c
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load r1, nble
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breq r0, r1, dgte
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breq r0, r1, dgte
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load r1, tbl1e
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load r1, nblf
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breq r0, r1, dgtf
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breq r0, r1, dgtf
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;Load the hexadecimal digit of the nibble
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;Load the hexadecimal digit of the nibble
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dgt0: load r0, tbl01
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dgt0: load r0, hex0
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt1: load r0, tbl03
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dgt1: load r0, hex1
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt2: load r0, tbl05
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dgt2: load r0, hex2
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt3: load r0, tbl07
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dgt3: load r0, hex3
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt4: load r0, tbl09
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dgt4: load r0, hex4
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt5: load r0, tbl0b
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dgt5: load r0, hex5
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt6: load r0, tbl0d
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dgt6: load r0, hex6
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt7: load r0, tbl0f
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dgt7: load r0, hex7
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt8: load r0, tbl11
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dgt8: load r0, hex8
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgt9: load r0, tbl13
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dgt9: load r0, hex9
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgta: load r0, tbl15
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dgta: load r0, hexa
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgtb: load r0, tbl17
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dgtb: load r0, hexb
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgtc: load r0, tbl19
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dgtc: load r0, hexc
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgtd: load r0, tbl1b
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dgtd: load r0, hexd
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgte: load r0, tbl1d
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dgte: load r0, hexe
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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dgtf: load r0, tbl1f
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dgtf: load r0, hexf
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breq r0, r0, n2hend
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breq r0, r0, n2hend
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;Return
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;Return
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n2hend: ret
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n2hend: ret
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;***
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;Data
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;Characters
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;Characters
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cr: data d
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cr: data d
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lf: data a
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lf: data a
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@ -132,36 +144,38 @@ prompt: data 3e
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;Mask
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;Mask
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mask: data f
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mask: data f
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;Nibble table
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nbl0: data 0
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nbl1: data 1
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nbl2: data 2
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nbl3: data 3
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nbl4: data 4
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nbl5: data 5
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nbl6: data 6
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nbl7: data 7
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nbl8: data 8
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nbl9: data 9
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nbla: data a
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nblb: data b
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nblc: data c
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nbld: data d
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nble: data e
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nblf: data f
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;Hexadecimal table
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;Hexadecimal table
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tbl00: data 0
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hex0: data 30
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tbl01: data 30
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hex1: data 31
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tbl02: data 1
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hex2: data 32
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tbl03: data 31
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hex3: data 33
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tbl04: data 2
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hex4: data 34
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tbl05: data 32
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hex5: data 35
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tbl06: data 3
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hex6: data 36
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tbl07: data 33
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hex7: data 37
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tbl08: data 4
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hex8: data 38
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tbl09: data 34
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hex9: data 39
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tbl0a: data 5
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hexa: data 41
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tbl0b: data 35
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hexb: data 42
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tbl0c: data 6
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hexc: data 43
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tbl0d: data 36
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hexd: data 44
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tbl0e: data 7
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hexe: data 45
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tbl0f: data 37
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hexf: data 46
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tbl10: data 8
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tbl11: data 38
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tbl12: data 9
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tbl13: data 39
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tbl14: data a
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tbl15: data 41
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tbl16: data b
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tbl17: data 42
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tbl18: data c
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tbl19: data 43
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tbl1a: data d
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tbl1b: data 44
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tbl1c: data e
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tbl1d: data 45
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tbl1e: data f
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tbl1f: data 46
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@ -1,15 +1,19 @@
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;String echo
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;String echo
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;Store the buffer start address in buffst
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;***
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;Input
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;Restore the buffer start address
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;High byte
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;High byte
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load r0, chstor + 1
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input: load r0, bfstrt
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store buffst, r0
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store chstor + 1, r0
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;Low byte
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;Low byte
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load r0, chstor + 2
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load r0, bfstrt + 1
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store buffst + 1, r0
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store chstor + 2, r0
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;Print a prompt
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;Print a prompt
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start: load r0, prompt
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load r0, prompt
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store ffff, r0
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store ffff, r0
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load r0, space
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load r0, space
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store ffff, r0
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store ffff, r0
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@ -20,19 +24,18 @@ start: load r0, prompt
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;Read a character
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;Read a character
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inloop: load r1, ffff
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inloop: load r1, ffff
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;Check for an escape
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;Check for control characters and the buffer end
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;Escape
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load r2, esc
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load r2, esc
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breq r1, r2, escbr
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breq r1, r2, escbr
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;Carriage return
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;Check for a return
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load r2, cr
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load r2, cr
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breq r1, r2, inend
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breq r1, r2, crbr
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;Buffer end
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;Check for end of the buffer
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load r2, bfsize
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load r2, buffsz
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brneq r0, r2, chstor
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brneq r0, r2, chstor
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;Backtrack if end of the buffer
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;Backtrack if at the buffer end
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load r2, bs
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load r2, bs
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store ffff, r2
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store ffff, r2
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breq r0, r0, inloop
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breq r0, r0, inloop
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@ -40,18 +43,15 @@ inloop: load r1, ffff
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;Store the character in the buffer
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;Store the character in the buffer
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chstor: store buffer, r1
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chstor: store buffer, r1
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;Increment the character counter and load it in r3
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;Increment the character counter and store it in r3
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;Increment
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load r2, one
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load r2, one
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cleq r0, r0, sum
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cleq r0, r0, sum
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;Store
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xor r3, r3
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xor r3, r3
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xor r3, r0
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xor r3, r0
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;Increment the buffer address
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;Increment the buffer address
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;High byte
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load r0, chstor + 1
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load r2, one
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cleq r0, r0, sum
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store chstor + 1, r0
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;Low byte
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;Low byte
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load r0, chstor + 2
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load r0, chstor + 2
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load r2, one
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load r2, one
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@ -72,74 +72,71 @@ chstor: store buffer, r1
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breq r0, r0, inloop
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breq r0, r0, inloop
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;Print a backslash and a newline
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;Print a backslash and a newline
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;Backslash
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escbr: load r0, space
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escbr: load r0, space
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store ffff, r0
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store ffff, r0
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load r0, bslash
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load r0, bslash
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store ffff, r0
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store ffff, r0
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;Newline
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load r0, cr
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load r0, cr
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store ffff, r0
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store ffff, r0
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load r0, lf
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load r0, lf
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store ffff, r0
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store ffff, r0
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;Restore the buffer address to its start
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;High byte
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load r0, buffst
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store chstor + 1, r0
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;Low byte
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load r0, buffst + 1
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store chstor + 2, r0
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;Start a new input line
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;Start a new input line
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breq r0, r0, start
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breq r0, r0, input
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;Store a string-terminating zero in the buffer
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;Store a string-terminating zero in the buffer
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inend: xor r0, r0
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;Get the buffer address
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load r1, chstor + 1
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crbr: load r1, chstor + 1
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store endsto + 1, r1
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store endsto + 1, r1
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load r1, chstor + 2
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load r1, chstor + 2
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store endsto + 2, r1
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store endsto + 2, r1
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;Store
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xor r0, r0
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endsto: store 0000, r0
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endsto: store 0000, r0
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;***
|
||||||
|
|
||||||
|
;Print
|
||||||
|
|
||||||
;Print a line feed and align with the input
|
;Print a line feed and align with the input
|
||||||
|
;Line feed
|
||||||
load r0, lf
|
load r0, lf
|
||||||
store ffff, r0
|
store ffff, r0
|
||||||
|
;Align
|
||||||
load r0, space
|
load r0, space
|
||||||
store ffff, r0
|
store ffff, r0
|
||||||
store ffff, r0
|
store ffff, r0
|
||||||
|
|
||||||
;Load a character from the buffer
|
;Load a character from the buffer
|
||||||
outlop: load r1, buffer
|
chprnt: load r1, buffer
|
||||||
|
|
||||||
;Check for string end
|
;Check for string end
|
||||||
xor r2, r2
|
xor r2, r2
|
||||||
breq r1, r2, outend
|
breq r1, r2, end
|
||||||
|
|
||||||
;Print the character
|
;Print the character
|
||||||
store ffff, r1
|
store ffff, r1
|
||||||
|
|
||||||
;Increment the buffer address
|
;Increment the buffer address
|
||||||
;High byte
|
|
||||||
load r0, outlop + 1
|
|
||||||
load r2, one
|
|
||||||
cleq r0, r0, sum
|
|
||||||
store outlop + 1, r0
|
|
||||||
;Low byte
|
;Low byte
|
||||||
load r0, outlop + 2
|
load r0, chprnt + 2
|
||||||
load r2, one
|
load r2, one
|
||||||
cleq r0, r0, sum
|
cleq r0, r0, sum
|
||||||
store outlop + 2, r0
|
store chprnt + 2, r0
|
||||||
;Add the overflow to the high byte
|
;Add the overflow to the high byte
|
||||||
load r0, outlop + 1
|
load r0, chprnt + 1
|
||||||
xor r2, r2
|
xor r2, r2
|
||||||
xor r2, r1
|
xor r2, r1
|
||||||
cleq r0, r0, sum
|
cleq r0, r0, sum
|
||||||
store outlop + 1, r0
|
store chprnt + 1, r0
|
||||||
|
|
||||||
;Print the next character
|
;Print the next character
|
||||||
breq r0, r0, outlop
|
breq r0, r0, chprnt
|
||||||
|
|
||||||
;Print a newline
|
;Print a newline
|
||||||
outend: load r0, cr
|
end: load r0, cr
|
||||||
store ffff, r0
|
store ffff, r0
|
||||||
load r0, lf
|
load r0, lf
|
||||||
store ffff, r0
|
store ffff, r0
|
||||||
|
|
@ -147,34 +144,52 @@ outend: load r0, cr
|
||||||
;Halt
|
;Halt
|
||||||
halt
|
halt
|
||||||
|
|
||||||
|
;***
|
||||||
|
|
||||||
;Add r2 to r0 with the overflow stored in r1
|
;Add r2 to r0 with the overflow stored in r1
|
||||||
|
|
||||||
;Reset overflow
|
;Reset overflow
|
||||||
sum: xor r1, r1
|
sum: xor r1, r1
|
||||||
store ovrflw, r1
|
store ovrflw, r1
|
||||||
|
|
||||||
;Copy the first argument to r1
|
;Copy the first argument to r1
|
||||||
sumlop: xor r1, r1
|
sumlop: xor r1, r1
|
||||||
xor r1, r0
|
xor r1, r0
|
||||||
|
|
||||||
;Calculate the sum and carry and copy the pre-shift carry to r1
|
;Calculate the sum and carry and copy the pre-shift carry to r1
|
||||||
|
;Sum
|
||||||
xor r0, r2
|
xor r0, r2
|
||||||
|
;Carry
|
||||||
and r2, r1
|
and r2, r1
|
||||||
|
;Copy the pre-shift carry
|
||||||
xor r1, r1
|
xor r1, r1
|
||||||
xor r1, r2
|
xor r1, r2
|
||||||
|
;Shift the carry
|
||||||
shl r2
|
shl r2
|
||||||
;Check for overflow
|
|
||||||
|
;Check for and store overflow if any
|
||||||
|
;Check
|
||||||
rol r1
|
rol r1
|
||||||
breq r1, r2, nvrflw
|
breq r1, r2, nvrflw
|
||||||
;Store overflow
|
;Store
|
||||||
load r1, one
|
load r1, one
|
||||||
store ovrflw, r1
|
store ovrflw, r1
|
||||||
|
|
||||||
;Check for no carry
|
;Check for no carry
|
||||||
nvrflw: xor r1, r1
|
nvrflw: xor r1, r1
|
||||||
breq r1, r2, sumend
|
breq r1, r2, sumend
|
||||||
|
|
||||||
;Loop
|
;Loop
|
||||||
breq r0, r0, sumlop
|
breq r0, r0, sumlop
|
||||||
|
|
||||||
;Load overflow and return
|
;Load overflow and return
|
||||||
sumend: load r1, ovrflw
|
sumend: load r1, ovrflw
|
||||||
ret
|
ret
|
||||||
|
|
||||||
|
;***
|
||||||
|
|
||||||
|
;Data
|
||||||
|
|
||||||
;Constants
|
;Constants
|
||||||
one: data 1
|
one: data 1
|
||||||
|
|
||||||
|
|
@ -191,7 +206,7 @@ bslash: data 5c
|
||||||
ovrflw: data 0
|
ovrflw: data 0
|
||||||
|
|
||||||
;Buffer
|
;Buffer
|
||||||
buffst: data 0
|
bfstrt: addr buffer
|
||||||
data 0
|
bfsize: data ff
|
||||||
buffsz: data f
|
|
||||||
buffer:
|
buffer:
|
||||||
|
|
|
||||||
|
|
@ -91,8 +91,8 @@ address FFFF. The emulator emulates a dumb terminal for this.
|
||||||
Arbitrary devices can be mapped to the other reserved addresses.
|
Arbitrary devices can be mapped to the other reserved addresses.
|
||||||
|
|
||||||
The emulator can be compiled in Linux with support for a dot matrix
|
The emulator can be compiled in Linux with support for a dot matrix
|
||||||
printer with the argument -dprinter. The printer must be set as the
|
printer at /dev/usb/lp0 with the argument -dprinter. The printer is
|
||||||
default in CUPS and will be mapped to address FFFE in the emulator.
|
mapped to address FFFE in the emulator.
|
||||||
|
|
||||||
Initial Program Loader
|
Initial Program Loader
|
||||||
----------------------
|
----------------------
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue