229 lines
3.7 KiB
ArmAsm
229 lines
3.7 KiB
ArmAsm
; Display Falling Apple II and message
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falling_half:
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;===================
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; init screen
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jsr TEXT
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jsr HOME
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bit KEYRESET
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;===================
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; init vars
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lda #0
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sta DRAW_PAGE
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sta FRAME
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sta FRAMEH
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;=============================
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; Load graphic page0
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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lda #<apple_low
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sta GBASL
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lda #>apple_low
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sta GBASH
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jsr load_rle_gr
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lda #4
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sta DRAW_PAGE
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jsr gr_copy_to_current ; copy to page1
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; GR part
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bit PAGE1
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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;=============================
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; Load graphic page1
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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lda #<apple_high
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sta GBASL
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lda #>apple_high
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sta GBASH
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jsr load_rle_gr
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lda #0
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sta DRAW_PAGE
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jsr gr_copy_to_current
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; GR part
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bit PAGE0
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;==============================
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; setup graphics for vapor lock
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;==============================
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jsr vapor_lock ; 6
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; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go
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jsr gr_copy_to_current ; 6+ 9292
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; now we have 322 left
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; GR part
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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; 322 - 12 = 310
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; - 3 for jmp
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; 307
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; Try X=9 Y=6 cycles=307
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ldy #6 ; 2
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faloopA:ldx #9 ; 2
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faloopB:dex ; 2
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bne faloopB ; 2nt/3
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dey ; 2
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bne faloopA ; 2nt/3
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jmp fa_display_loop ; 3
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.align $100
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;================================================
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; Display Loop
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;================================================
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; each scan line 65 cycles
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; 1 cycle each byte (40cycles) + 25 for horizontal
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; Total of 12480 cycles to draw screen
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; Vertical blank = 4550 cycles (70 scan lines)
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; Total of 17030 cycles to get back to where was
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; in the end, scrolling in was deemed to complex
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; what we do is load both to PAGE1/PAGE2 and then
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; slowly shift from all PAGE1 to PAGE1/PAGE every two scanlines
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fa_display_loop:
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ldy #48 ; 2
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outer_loop:
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bit PAGE0 ; 4
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ldx #25 ; 130 cycles with PAGE0 ; 2
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page0_loop: ; delay 126+bit
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dex ; 2
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bne page0_loop ; 2/3
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bit PAGE1 ; 4
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ldx #23 ; 130 cycles with PAGE1 ; 2
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page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
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dex ; 2
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bne page1_loop ; 2/3
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nop ; 2
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lda DRAW_PAGE ; 3
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dey ; 2
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bne outer_loop ; 2/3
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;======================================================
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; We have 4550 cycles in the vblank, use them wisely
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;======================================================
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; 4550 cycles
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; -1 (+1-2) from above
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; -25 inc framecount
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; -7 see if timeout
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;-1023 play_music
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; -10 keypress
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;================
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; 3484
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jsr play_music ; 6+1017
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; Try X=231 Y=3 cycles=3484
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ldy #3 ; 2
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faloop1:ldx #231 ; 2
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faloop2:dex ; 2
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bne faloop2 ; 2nt/3
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dey ; 2
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bne faloop1 ; 2nt/3
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;========================
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; Increment Frame at 20Hz
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;========================
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; noinc: 13+12=25
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; inc: 13+12=25
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inc FRAME ; 5
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lda FRAME ; 3
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cmp #4 ; 2
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bne fa_noinc ; 3
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; -1
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lda #0 ; 2
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sta FRAME ; 3
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inc FRAMEH ; 5
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jmp fa_doneinc ; 3
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fa_noinc:
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lda $0 ; 3
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lda $0 ; 3
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lda $0 ; 3
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lda $0 ; 3
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fa_doneinc:
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;====================
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; exit after 5s or so
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;====================
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; 7 cycles
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lda FRAMEH ; 3
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cmp #100 ; 2
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nop
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;beq fa_done ; 3
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; -1
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;=====================
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; check for keypress
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; 10 cycles
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lda KEYPRESS ; 4
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bpl fa_no_keypress ; 3
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jmp fa_done
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fa_no_keypress:
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jmp fa_display_loop ; 3
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fa_done:
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bit KEYRESET ; clear keypress ; 4
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rts ; 6
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;.include "../asm_routines/gr_unrle.s"
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;.include "gr_copy.s"
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;.include "apple_40_96.inc"
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