33 lines
457 B
ArmAsm
33 lines
457 B
ArmAsm
.define putchr
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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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! output routine in monitor
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CRT = 0x013B
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! output a charcter
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! entry: ascii character in a
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putchr:
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push hl
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push bc
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ld hl,tab
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ld b,5
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1: cp (hl)
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jr z,fetch
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inc hl
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inc hl
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djnz 1b
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2: call CRT
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pop bc
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pop hl
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ret
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fetch: inc hl
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ld a,(hl)
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jr 2b
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! conversion table for nascom characters
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tab: .data1 0x0D,0x00
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.data1 0x1B,0x1E
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.data1 0x08,0x1D
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.data1 0x0A,0x1F
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.data1 0x7F,0x00
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