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419eb700b5
The way we want to use the INITBSS segment - and especially the fact that it won't have the type bss on all ROM based targets - means that the name INITBSS is misleading. After all INIT is the best name from my perspective as it serves several purposes and therefore needs a rather generic name. Unfortunately this means that the current INIT segment needs to be renamed too. Looking for a short (ideally 4 letter) name I came up with ONCE as it contains all code (and data) accessed only once during initialization.
118 lines
2.3 KiB
ArmAsm
118 lines
2.3 KiB
ArmAsm
.include "pce.inc"
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.include "extzp.inc"
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.import vce_init
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.import psg_init
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.import colors
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.importzp ptr1, tmp1
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.constructor initconio
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.macpack longbranch
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.segment "ONCE"
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initconio:
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jsr vce_init
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jsr psg_init
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jsr conio_init
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jsr set_palette
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st0 #VDC_CR
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st1 #<$0088
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st2 #>$0088
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rts
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set_palette:
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stz VCE_ADDR_LO
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stz VCE_ADDR_HI
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ldx #0
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@lp:
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ldy #16
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@lp1:
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lda colors,x
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sta VCE_DATA_LO
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lda colors+1,x
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sta VCE_DATA_HI
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dey
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bne @lp1
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inx
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inx
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cpx #16*2
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jne @lp
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stz VCE_ADDR_LO
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stz VCE_ADDR_HI
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stz VCE_DATA_LO
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stz VCE_DATA_HI
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rts
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conio_init:
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; Load font
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st0 #VDC_MAWR
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st1 #<$2000
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st2 #>$2000
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; ptr to font data
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lda #<font
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sta ptr1
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lda #>font
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sta ptr1+1
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st0 #VDC_VWR ; VWR
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lda #0
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sta tmp1
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jsr copy
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lda #<font
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sta ptr1
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lda #>font
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sta ptr1+1
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lda #$ff
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sta tmp1
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jsr copy
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ldx #0
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stx BGCOLOR
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inx
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stx CHARCOLOR
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rts
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copy:
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ldy #$80 ; 128 chars
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charloop:
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ldx #$08 ; 8 bytes/char
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lineloop:
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lda (ptr1)
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eor tmp1
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sta a:VDC_DATA_LO ; bitplane 0
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stz a:VDC_DATA_HI ; bitplane 1
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clc ; increment font pointer
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lda ptr1
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adc #$01
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sta ptr1
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lda ptr1+1
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adc #$00
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sta ptr1+1
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dex
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bne lineloop ; next bitplane 0 byte
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ldx #$08 ; fill bitplane 2/3 with 0
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fillloop:
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st1 #$00
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st2 #$00
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dex
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bne fillloop ; next byte
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dey
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bne charloop ; next character
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rts
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font:
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.include "vga.inc"
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