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42 lines
972 B
ArmAsm
42 lines
972 B
ArmAsm
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.include "pce.inc"
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; FIXME: implement selection of different video modes at runtime
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HIRES = 1
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.export vdc_init
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vdc_init:
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lda a:VDC_CTRL
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VREG $00, $0000 ; MAWR
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VREG $01, $0000 ; MARR
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VREG $05, $0000 ; CR
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VREG $06, $0000 ; RCR
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VREG $07, $0000 ; BXR
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VREG $08, $0000 ; BYR
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VREG $09, $0070 ; MAWR
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VREG $0C, $1702 ; CRTC - VSR
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VREG $0D, $00DF ; CRTC - VDS
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VREG $0E, $000C ; CRTC - VDE
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VREG $0F, $0000 ; DCR
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.if HIRES
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VREG $0A, $0C02 ; CRTC - HSR
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VREG $0B, $043C ; CRTC - HDS
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lda #$06
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sta VCE_CTRL
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.else
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VREG $0A, $0202 ; CRTC - HSR
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VREG $0B, $041F ; CRTC - HDS
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lda #$04
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sta VCE_CTRL
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.endif
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lda a:VDC_CTRL
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rts
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