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93 lines
2.3 KiB
ArmAsm
93 lines
2.3 KiB
ArmAsm
; setup alternative CONIO screen (20x12, Antic mode 7, BASIC mode 2)
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;
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; 02-Apr-2019, Christian Groessler <chris@groessler.org>
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.include "atari5200.inc"
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SCREEN_BUF_SIZE = 20 * 12
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SCREEN_BUF = $4000 - SCREEN_BUF_SIZE
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.export screen_setup
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.export screen_width, screen_height
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.export conio_color
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screen_width = 20
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screen_height = 12
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.segment "ONCE"
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; initialize color registers, display list, and screen memory
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screen_setup:
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; initialize SAVMSC
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lda #<SCREEN_BUF
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sta SAVMSC
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lda #>SCREEN_BUF
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sta SAVMSC+1
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; initialize cursor position
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lda #0
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sta COLCRS_5200
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sta ROWCRS_5200
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; clear screen buffer
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ldy #<(SCREEN_BUF_SIZE-1)
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ldx #>(SCREEN_BUF_SIZE-1)
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clrscr: sta (SAVMSC),y
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dey
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cpy #$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 #GTIA_COLOR_WHITE
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sta COLOR0
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lda #GTIA_COLOR_LIGHTRED
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sta COLOR1
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lda #GTIA_COLOR_LIGHTGREEN
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sta COLOR2
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lda #GTIA_COLOR_BLACK
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sta COLOR3
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sta COLOR4 ; background
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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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.bss
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conio_color: .res 1
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.segment "DLIST"
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; display list for 20x12 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_CHR20x16x2 | DL_LMS
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.word SCREEN_BUF
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.repeat 11
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.byte DL_CHR20x16x2
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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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