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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.
84 lines
2.0 KiB
ArmAsm
84 lines
2.0 KiB
ArmAsm
; setup default CONIO screen (20x24, Antic mode 6, BASIC mode 1)
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;
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; 28-May-2014, Christian Groessler <chris@groessler.org>
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.include "atari5200.inc"
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SCREEN_BUF_SIZE = 20 * 24
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SCREEN_BUF = $4000 - SCREEN_BUF_SIZE
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.export screen_setup_20x24
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.segment "ONCE"
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screen_setup_20x24:
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; initialize SAVMSC
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lda #<SCREEN_BUF
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sta SAVMSC
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lda #>SCREEN_BUF
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sta SAVMSC+1
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; initialize cursor position
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lda #0
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sta COLCRS_5200
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sta ROWCRS_5200
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; clear screen buffer
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ldy #<(SCREEN_BUF_SIZE-1)
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ldx #>(SCREEN_BUF_SIZE-1)
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clrscr: sta (SAVMSC),y
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dey
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cpy #$FF
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bne clrscr
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dex
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cpx #$FF
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bne clrscr
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; set default colors
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lda #40
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sta COLOR0
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lda #202
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sta COLOR1
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lda #148
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sta COLOR2
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lda #70
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sta COLOR3
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lda #0
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sta COLOR4
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; set display list
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lda #<dlist
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sta SDLSTL
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lda #>dlist
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sta SDLSTH
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rts
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.segment "RODATA"
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; display list for 20x24 text mode
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dlist: .repeat 3
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.byte DL_BLK8
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.endrepeat
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.byte DL_CHR20x8x2 | DL_LMS
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.word SCREEN_BUF
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.repeat 23
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.byte DL_CHR20x8x2
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.endrepeat
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.byte DL_JVB
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.word dlist
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; end of display list
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.assert ((* >> 10) = (dlist >> 10)), error, "Display list crosses 1K boundary"
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.end
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