182 lines
4.0 KiB
NASM
182 lines
4.0 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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;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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cleq r0, r0, n2hex
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;Print
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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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;Convert and print the low nibble
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;Convert
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cleq r0, r0, n2hex
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;Print
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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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;***
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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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;***
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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, nbl0
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breq r0, r1, dgt0
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load r1, nbl1
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breq r0, r1, dgt1
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load r1, nbl2
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breq r0, r1, dgt2
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load r1, nbl3
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breq r0, r1, dgt3
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load r1, nbl4
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breq r0, r1, dgt4
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load r1, nbl5
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breq r0, r1, dgt5
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load r1, nbl6
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breq r0, r1, dgt6
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load r1, nbl7
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breq r0, r1, dgt7
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load r1, nbl8
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breq r0, r1, dgt8
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load r1, nbl9
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breq r0, r1, dgt9
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load r1, nbla
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breq r0, r1, dgta
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load r1, nblb
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breq r0, r1, dgtb
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load r1, nblc
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breq r0, r1, dgtc
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load r1, nbld
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breq r0, r1, dgtd
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load r1, nble
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breq r0, r1, dgte
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load r1, nblf
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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, hex0
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breq r0, r0, n2hend
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dgt1: load r0, hex1
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breq r0, r0, n2hend
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dgt2: load r0, hex2
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breq r0, r0, n2hend
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dgt3: load r0, hex3
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breq r0, r0, n2hend
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dgt4: load r0, hex4
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breq r0, r0, n2hend
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dgt5: load r0, hex5
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breq r0, r0, n2hend
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dgt6: load r0, hex6
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breq r0, r0, n2hend
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dgt7: load r0, hex7
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breq r0, r0, n2hend
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dgt8: load r0, hex8
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breq r0, r0, n2hend
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dgt9: load r0, hex9
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breq r0, r0, n2hend
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dgta: load r0, hexa
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breq r0, r0, n2hend
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dgtb: load r0, hexb
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breq r0, r0, n2hend
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dgtc: load r0, hexc
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breq r0, r0, n2hend
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dgtd: load r0, hexd
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breq r0, r0, n2hend
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dgte: load r0, hexe
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breq r0, r0, n2hend
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dgtf: load r0, hexf
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breq r0, r0, n2hend
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;Return
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n2hend: ret
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;***
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;Data
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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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;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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hex0: data 30
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hex1: data 31
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hex2: data 32
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hex3: data 33
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hex4: data 34
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hex5: data 35
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hex6: data 36
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hex7: data 37
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hex8: data 38
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hex9: data 39
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hexa: data 41
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hexb: data 42
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hexc: data 43
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hexd: data 44
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hexe: data 45
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hexf: data 46
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