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66 lines
906 B
ArmAsm
66 lines
906 B
ArmAsm
;
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; Christian Groessler, November-2002
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;
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; get a char from the keyboard
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; char cgetc(void)
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;
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.include "atari.inc"
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.export _cgetc,setcursor
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.import cursor,mul40
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_cgetc:
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jsr setcursor
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jsr @1
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ldx #0
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rts
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@1: lda KEYBDV+5
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pha
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lda KEYBDV+4
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pha
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lda #12
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sta ICAX1Z ; fix problems with direct call to KEYBDV
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rts
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.proc setcursor
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ldy #0
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lda OLDCHR
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sta (OLDADR),y
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lda ROWCRS
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jsr mul40
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clc
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adc SAVMSC ; add start of screen memory
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sta OLDADR
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txa
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adc SAVMSC+1
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sta OLDADR+1
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lda COLCRS
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adc OLDADR
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sta OLDADR
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bcc nc
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inc OLDADR+1
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nc: lda (OLDADR),y
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sta OLDCHR
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ldx cursor ; current cursor setting as requested by the user
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beq off
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ldx #0
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beq cont
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off: inx
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cont: stx CRSINH ; update system variable
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beq turnon
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and #$7f ; clear high bit / inverse flag
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finish: sta (OLDADR),y ; update on-screen display
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rts
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turnon: ora #$80 ; set high bit / inverse flag
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bne finish
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.endproc
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