36 lines
487 B
ArmAsm
36 lines
487 B
ArmAsm
.define getchar, putchar
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! These getchar and putchar routines can be used for HERMAC computer
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! Read a character from HERMAC-monitor
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! Character is returned in a-reg
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getchar:
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in a,0xF1
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and 1
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jp z,getchar
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in a,0xF0
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cp 0x0D
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jp nz,1f
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ld a,0x0A
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1: ret
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! Write character on HERMAC monitor
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! Assumes character in a-reg
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putchar:
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cp 0x0A
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jp nz,1f
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ld a,0x1F
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1: push af
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2: in a,0xF1
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and 4
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jp z,2b
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pop af
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out 0xF0,a
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ret
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