168 lines
3.8 KiB
NASM
168 lines
3.8 KiB
NASM
;ASCII code printer
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;Print a prompt
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load r0, prompt
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store ffff, r0
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load r0, space
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store ffff, r0
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;Read a character to r0 and load it to r2
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load r0, ffff
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xor r2, r2
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xor r2, r0
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;Print a newline and align
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cleq r0, r0, newln
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load r1, space
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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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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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;Print the digit
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store ffff, r0
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;Re-load the character to r0
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xor r0, r0
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xor r0, r2
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;Get the hexadecimal digit of the low nibble
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cleq r0, r0, n2hex
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;Print the digit
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store ffff, r0
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;Print a newline
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cleq r0, r0, newln
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;Halt
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halt
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;Print a newline
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newln: load r1, cr
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store ffff, r1
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load r1, lf
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store ffff, r1
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ret
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;Get the hexadecimal digit of a nibble
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;Extract the low nibble
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n2hex: load r1, mask
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and r0, r1
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;Locate the nibble in the table
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load r1, tbl00
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breq r0, r1, dgt0
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load r1, tbl02
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breq r0, r1, dgt1
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load r1, tbl04
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breq r0, r1, dgt2
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load r1, tbl06
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breq r0, r1, dgt3
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load r1, tbl08
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breq r0, r1, dgt4
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load r1, tbl0a
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breq r0, r1, dgt5
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load r1, tbl0c
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breq r0, r1, dgt6
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load r1, tbl0e
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breq r0, r1, dgt7
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load r1, tbl10
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breq r0, r1, dgt8
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load r1, tbl12
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breq r0, r1, dgt9
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load r1, tbl14
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breq r0, r1, dgta
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load r1, tbl16
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breq r0, r1, dgtb
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load r1, tbl18
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breq r0, r1, dgtc
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load r1, tbl1a
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breq r0, r1, dgtd
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load r1, tbl1c
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breq r0, r1, dgte
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load r1, tbl1e
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breq r0, r1, dgtf
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;Load the hexadecimal digit of the nibble
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dgt0: load r0, tbl01
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breq r0, r0, n2hend
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dgt1: load r0, tbl03
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breq r0, r0, n2hend
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dgt2: load r0, tbl05
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breq r0, r0, n2hend
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dgt3: load r0, tbl07
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breq r0, r0, n2hend
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dgt4: load r0, tbl09
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breq r0, r0, n2hend
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dgt5: load r0, tbl0b
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breq r0, r0, n2hend
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dgt6: load r0, tbl0d
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breq r0, r0, n2hend
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dgt7: load r0, tbl0f
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breq r0, r0, n2hend
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dgt8: load r0, tbl11
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breq r0, r0, n2hend
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dgt9: load r0, tbl13
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breq r0, r0, n2hend
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dgta: load r0, tbl15
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breq r0, r0, n2hend
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dgtb: load r0, tbl17
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breq r0, r0, n2hend
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dgtc: load r0, tbl19
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breq r0, r0, n2hend
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dgtd: load r0, tbl1b
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breq r0, r0, n2hend
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dgte: load r0, tbl1d
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breq r0, r0, n2hend
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dgtf: load r0, tbl1f
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breq r0, r0, n2hend
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;Return
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n2hend: ret
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;Characters
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cr: data d
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lf: data a
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space: data 20
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prompt: data 3e
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;Mask
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mask: data f
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;Hexadecimal table
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tbl00: data 0
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tbl01: data 30
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tbl02: data 1
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tbl03: data 31
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tbl04: data 2
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tbl05: data 32
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tbl06: data 3
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tbl07: data 33
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tbl08: data 4
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tbl09: data 34
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tbl0a: data 5
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tbl0b: data 35
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tbl0c: data 6
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tbl0d: data 36
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tbl0e: data 7
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tbl0f: data 37
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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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