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149 lines
2.4 KiB
ArmAsm
149 lines
2.4 KiB
ArmAsm
;
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; 2017-12-28, Groepaz
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;
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; char cpeekc (void);
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;
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.export soft80_cpeekc, soft80_cpeekchar
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.include "c64.inc"
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.include "soft80.inc"
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.macpack longbranch
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.segment "CODE"
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soft80_cpeekc:
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jsr soft80_cpeekchar
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; 0-1F -> A0-BF
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; 20-7F -> 20-7F
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cmp #$20
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bcs @sk
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;clc
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adc #$a0
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@sk:
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ldx #0
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rts
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soft80_cpeekchar:
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sei
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lda #$34
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sta $01
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lda CURS_X
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and #$01
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jne @l1a
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; test non-inverted character (left side)
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ldx #0
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@l2aa:
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ldy #0
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$f0
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cmp soft80_hi_charset+(line*$80),x
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bne @l2b
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.if (line < 7)
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iny
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.endif
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.endrepeat
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@backok:
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lda #$36
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sta $01
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cli
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txa ; return char in A
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ldx #$00 ; revers flag
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rts
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@l2b:
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inx
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cpx #$80
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jne @l2aa
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; test inverted character (left side)
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ldx #0
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@l2aa2:
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ldy #0
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$f0
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eor #$f0
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cmp soft80_hi_charset+(line*$80),x
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bne @l2b2
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.if (line < 7)
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iny
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.endif
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.endrepeat
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@backokrevers:
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lda #$36
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sta $01
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cli
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txa ; return char in A
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ldx #$01 ; revers flag
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rts
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@l2b2:
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inx
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cpx #$80
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jne @l2aa2
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@backerr:
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lda #$36
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sta $01
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cli
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ldx #0
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txa
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rts
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; test non-inverted character (right side)
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@l1a:
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ldx #0
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@l1aa:
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ldy #0
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$0f
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eor soft80_lo_charset+(line*$80),x
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bne @l2bb
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.if line < 7
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iny
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.endif
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.endrepeat
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jmp @backok
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@l2bb:
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inx
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cpx #$80
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bne @l1aa
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; test inverted character (right side)
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ldx #0
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@l1aa2:
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ldy #0
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.repeat 8,line
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lda (SCREEN_PTR),y
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and #$0f
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eor #$0f
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eor soft80_lo_charset+(line*$80),x
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bne @l2bb2
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.if line < 7
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iny
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.endif
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.endrepeat
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jmp @backokrevers
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@l2bb2:
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inx
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cpx #$80
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bne @l1aa2
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jmp @backerr
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