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incGRAPHICCommand.asm
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;*******************************************************************************
;* Graphics Routine *
;* This sets up the VIC Chip into HiRes Graphic Mode *
;* *****************************************************************************
;* Syntax : graphic or g shifted R *
;*******************************************************************************
; graphic : graphic
COM_GRAPHIC
; lda #0
; sta RIBUF
; lda #$A0
; sta RIBUF + 1
;GRAP
; ldy #0
;GRAP_Loop
; lda #0
; sta (RIBUF),y
; iny
; bne GRAP_Loop
; inc RIBUF + 1
; lda RIBUF + 1
; cmp #$C0
; bne GRAP
lda CIA2_DDRA
ora #%00000011
sta CIA2_DDRA
lda CIA2_PRA
and #255 - CIA2_PRA_VICBank_Mask
ora #CIA2_PRA_VICBank_2 ; Change VIC Chip to Bank 2
;ora #CIA2_PRA_VICBank_3 ; Change VIC Chip to Bank 3
sta CIA2_PRA
lda VICII_VMCSB
ora #%00001000 ; Change VIC Chip Video Address
;and #%00000001
;ora #%00001010 ; Change VIC Chip Video Address
sta VICII_VMCSB
lda VICII_SCROLY
ora #VICII_SCROLY_ExtendedColourMode
sta VICII_SCROLY
GRAP_ClearScreen
ldy #0
lda COMM_GRAPHIC_COLOUR
GRAP_BlankScreen
sta $8400,y
sta $8500,y
sta $8600,y
sta $8700,y
iny
bne GRAP_BlankScreen
rts