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52 lines
1.0 KiB
ArmAsm
52 lines
1.0 KiB
ArmAsm
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; 2016-02-28, Groepaz
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; 2017-06-26, Greg King
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;
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; unsigned char cpeekrevers (void);
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;
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.export _cpeekrevers
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.include "zeropage.inc"
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.include "c128.inc"
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_cpeekrevers:
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lda MODE
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bmi @c80
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ldy CURS_X
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lda (SCREEN_PTR),y ; get char
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@return:
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and #$80 ; get reverse flag
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asl a
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tax ; ldx #>$0000
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rol a ; return boolean value
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rts
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@c80:
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lda SCREEN_PTR
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ldy SCREEN_PTR+1
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clc
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adc CURS_X
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bcc @s
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iny
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; get byte from VDC mem
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@s: ldx #VDC_DATA_LO
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stx VDC_INDEX
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@L0: bit VDC_INDEX
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bpl @L0
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sta VDC_DATA
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dex
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stx VDC_INDEX
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sty VDC_DATA
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ldx #VDC_RAM_RW
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stx VDC_INDEX
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@L1: bit VDC_INDEX
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bpl @L1 ; wait for blanking
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lda VDC_DATA
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jmp @return
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