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