mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-11 05:29:38 +00:00
176 lines
3.4 KiB
ArmAsm
176 lines
3.4 KiB
ArmAsm
; Blargh
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; by Vince `deater` Weaver
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.include "zp.inc"
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.include "hardware.inc"
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double:
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lda #0
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sta FRAME
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lda #$ff
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sta FRAMEH
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;================================
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; Clear screen and setup graphics
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;================================
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jsr SETGR ; set lo-res 40x40 mode
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bit LORES
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sta FULLGR
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;====================================================
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; setup text page2 screen of "Apple II Forever" text
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;====================================================
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; there are much better ways to accomplish this
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sta SETMOUSETEXT
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ldy #0
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ldx #0
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sty XX
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a24e_newy:
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lda gr_offsets_l,Y
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sta stringing_smc+1
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lda gr_offsets_h,Y
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clc
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adc #4
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sta stringing_smc+2
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a24e_loop:
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lda a2_string,X
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bne keep_stringing
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ldx #0
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lda a2_string,X
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keep_stringing:
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inx
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eor #$80
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stringing_smc:
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sta $d000
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inc stringing_smc+1
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inc XX
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lda XX
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cmp #40
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bne a24e_loop
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lda #0
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sta XX
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iny
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cpy #24
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bne a24e_newy
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stringing_done:
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bit PAGE2
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blog:
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ldx #255
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blog_loop:
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jsr delay_12 ; 12
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bit SET_GR ; 4
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; 16
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jsr delay_12 ; 12
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; 28
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bit SET_TEXT ; 4
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; 32
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jsr delay_12 ; 12
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; 44
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bit SET_GR ; 4
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; 48
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jsr delay_12 ; 12
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; 60
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dex ; 2
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; bne blog_loop ; 2/3
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jmp blog_loop ; 3
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delay_12:
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rts
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.if 0
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; -1
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;==================================
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; vblank = 4550 cycles
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; Try X=226 Y=4 cycles=4545
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skip_vblank:
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lda $00 ; nop3
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ldy #4 ; 2
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loop3: ldx #226 ; 2
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loop4: dex ; 2
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bne loop4 ; 2nt/3
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dey ; 2
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bne loop3 ; 2nt/3
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jmp midline_loop ; 3
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.align $100
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;===================================
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; wait y-reg times 10
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;===================================
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loop10:
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bne skip
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waitx10:
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dey ; wait y-reg times 10 ; 2
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skip:
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dey ; 2
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nop ; 2
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bne loop10 ; 2/3
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rts ; 6
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;===================================
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; wait x-reg times 1000
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;===================================
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loop1k:
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pha ; 3
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pla ; 4
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nop ; 2
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nop ; 2
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waitx1k:
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ldy #98 ; wait x-reg times 1000 ; 2
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jsr waitx10 ; 980
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nop ; 2
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dex ; 2
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bne loop1k ; 2/3
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rts1:
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rts ; 6
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.include "vblank.s"
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.endif
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.include "gr_offsets.s"
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a2_string:
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; 012345678901234567 8 9
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.byte "Apple II Forever!! ",'@'+$80," "
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.byte "Apple II Forever! ",'@'+$80," ",0
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