51 lines
638 B
ArmAsm
51 lines
638 B
ArmAsm
.define getchar, putchar
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! These getchar and putchar routines can be used for NASCOM computer.
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! Read character from NASCOM-monitor
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! Character is returned in a-reg
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getchar:
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call 0x69
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jnc getchar
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cpi 0x1F
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jz CR
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cpi 0x1D
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jz BS
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ret
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CR: mvi a,0x0A
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ret
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BS: mvi a,0x08
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ret
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! Write charcacter on NASCOM-monitor
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! Assumes character in a-reg
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putchar:
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push h
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push b
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lxi h,tab
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mvi b,5
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1: cmp m
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jz fetch
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inx h
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inx h
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dcr b
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jnz 1b
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2: call 0x013B
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pop b
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pop h
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ret
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fetch: inx h
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mov a,m
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jmp 2b
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! conversion table for NASCOM characters
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tab: .byte 0x0D,0x00
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.byte 0x1B,0x1E
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.byte 0x08,0x1D
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.byte 0x0A,0x1F
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.byte 0x7F,0x00
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