mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-04 05:05:13 +00:00
438 lines
8.8 KiB
ArmAsm
438 lines
8.8 KiB
ArmAsm
; C64 Opener
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; all good demos start with the C64 boot screen, right?
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; Apple II has a lot of trouble making clear text with bluish background
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; it looks a lot cleaner in black+white
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; Zero page addresses
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c64_opener:
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;===================
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; init vars
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;===================
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lda #0
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sta FRAME
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sta FRAMEH
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;===================
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; setup graphics
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;===================
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; We assume that the c64 image was put in $2000 by the loader
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;===================
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; setup text
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;===================
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lda #8
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sta DRAW_PAGE
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lda #$A0 ; regular spaces
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jsr clear_gr
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lda #<apple2_text
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sta OUTL
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lda #>apple2_text
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sta OUTH
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jsr move_and_print
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jsr move_and_print
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jsr move_and_print
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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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bit PAGE0 ; first graphics page ; 4
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bit FULLGR ; full screen graphics ; 4
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bit HIRES ; hires mode !!! ; 4
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bit SET_GR ; graphics mode ; 4
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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 + 4550 lines to go (9620)
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; - 16 = 9604, -3 for jmp = 9601
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; 5070+4550 = 9620
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; -16
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; -3
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; +1 to get things aligned?
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; -9298
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; =======
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; 304
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jsr gr_copy_to_current ; 6+ 9292
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; Try X=29 Y=2 cycles=303
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; Try X=59 Y=1 cycles=302 R2
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nop
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ldy #1 ; 2
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loopcoA:ldx #59 ; 2
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loopcoB:dex ; 2
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bne loopcoB ; 2nt/3
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dey ; 2
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bne loopcoA ; 2nt/3
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beq c64_split
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;.align $100
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;================================================
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; c64_split
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;================================================
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; We want to:
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; Wait 3s, just flashing cursor@1Hz
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; Then slowly open to text page0
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c64_split:
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c64_mixed:
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jmp c64_kill_time ; 3
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; Put smc here to jmp to kill_time until we hit state2?
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; EA nop ; kill 6 cycles (room for rts) ; 2
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; A2 08 ldx #8 ; width of opening in table ; 2
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ldy #24 ; height? ; 2
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c64_mixed_loop:
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c64_smc2:
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lda c64_multiples+17,x ; lookup split size ; 4 \
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sta c64_smc+1 ; modify code ; 4 |
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c64_smc: ; |-- 65
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jsr tsplit_4 ; 6+46 |
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dey ; 2 |
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bne c64_mixed_loop ; 3 /
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; -1
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nop ; 2
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ldy #24 ; 2
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dex ; 2
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bne c64_smc ; 3
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; -1
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; need to kill
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; -6 from offset
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; +1 fall through
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; -9 from check
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; +1 from other fallthrough
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;================
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; -13
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c64_done_screen:
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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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; do_nothing should be 4550
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; -13 from screen drawing
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; -10 keyboard handling
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; -27 frameh adjustment
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; -44 state2 handling
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; -24 done_blinding
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; -7 check if past time
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; -46 cursor blink
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; -1038 play music
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;==================================
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; = 3341
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; run the 2Hz counter, overflow at 30 60Hz frames
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clc ; 2
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lda FRAME ; 3
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adc #1 ; 2
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sta FRAME ; 3
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cmp #30 ; 2
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bne not_thirty ; 3
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;===========
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; 15
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thirty:
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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 done_thirty ; 3
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;===========
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; 12
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not_thirty:
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lda $0 ; nop ; 3
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lda $0 ; nop ; 3
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lda $0 ; nop ; 3
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lda $0 ; nop ; 3
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;===========
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; 12
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done_thirty:
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c64_window_adjust:
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;===========================
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; If > 3.5s then patch SMC and move window
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;===========================
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; < 7 = 8+36 = 44
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; > 7, not tick = 8+36=44
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lda FRAMEH ; 3
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cmp #7 ; 2
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bcc c64_not_state2 ; 3
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;============
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; 8
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; Update the code to not kill_time but do the split ; -1
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lda #$EA ; 2
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sta c64_mixed ; 4
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lda #$A2 ; 2
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sta c64_mixed+1 ; 4
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lda #$08 ; 2
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sta c64_mixed+2 ; 4
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lda FRAME ; 3
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and #$03 ; 2
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bne blj ; 3
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;===========
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; 25
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; -1
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c64_smc3:
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dec c64_smc2+1 ; 6
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jmp blj_done ; 3
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;============
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; 8
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blj:
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nop
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lda $0
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lda $0
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blj_done:
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jmp c64_done_states ; 3
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;===================
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; 36
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c64_not_state2:
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inc $0 ; 5
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dec $0 ; 5
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inc $0 ; 5
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dec $0 ; 5
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inc $0 ; 5
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dec $0 ; 5
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lda $0 ; 3
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lda $0 ; 3
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c64_done_states:
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;=======================
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; see if done blinding
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;=======================
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;
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lda FRAMEH ; 3
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cmp #9 ; 2
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bne c64_wait_blinding ; 3
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;===========
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; 8
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; -1
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lda #$ea ; 2
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sta c64_smc3 ; 4
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sta c64_smc3+1 ; 4
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sta c64_smc3+2 ; 4
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jmp c64_done_blinding ; 3
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;===========
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; 16
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c64_wait_blinding:
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lda $0
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lda $0
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lda $0
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lda $0
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nop
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nop
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c64_done_blinding:
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;=======================
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; see if done
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;=======================
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lda FRAMEH ; 3
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cmp #22 ; 2
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beq done_c64 ; 3
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; -1
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;============
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; 7
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c64_blink_cursor:
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; handle the cursor
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; FIXME: not aligned well. Do we care?
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lda FRAMEH ; 3
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and #$1 ; 2
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beq cursor_off ; 3
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;============
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; 8
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cursor_on:
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; -1
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; it's lSB first
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; blue is 6
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; 1 1111110
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lda #$fE ; blue ; 2
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sta $3300 ; 52 ; 4
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sta $3B00 ; 54 ; 4
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sta $2380 ; 56 ; 4
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sta $2B80 ; 58 ; 4
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; purple is 2
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; 0 1111110
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lda #$7E ; purple ; 2
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sta $3700 ; 53 ; 4
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sta $3F00 ; 55 ; 4
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sta $2780 ; 57 ; 4
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sta $2F80 ; 59 ; 4
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jmp cursor_done ; 3
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;============
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; 38
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cursor_off:
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; blue is 6
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; 1 1010101
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lda #$d5 ; blue ; 2
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sta $3300 ; 52 ; 4
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sta $3B00 ; 54 ; 4
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sta $2380 ; 56 ; 4
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sta $2B80 ; 58 ; 4
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; purple is 2
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; 0 1010101
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lda #$55 ; purple ; 2
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sta $3700 ; 53 ; 4
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sta $3F00 ; 55 ; 4
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sta $2780 ; 57 ; 4
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sta $2F80 ; 59 ; 4
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nop ; 2
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;============
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; 38
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cursor_done:
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jsr play_music ; 6+1032
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; Try X=110 Y=6 cycles=3337 R4
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nop
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nop
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ldy #6 ; 2
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loopcoE:ldx #110 ; 2
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loopcoF:dex ; 2
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bne loopcoF ; 2nt/3
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dey ; 2
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bne loopcoE ; 2nt/3
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lda KEYPRESS ; 4
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bpl no_c64_keypress ; 3
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jmp done_c64
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no_c64_keypress:
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jmp c64_split ; 3
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done_c64:
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bit KEYRESET
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;jsr mockingboard_mute
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cli
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rts ; 6
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;===================
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; c64 graphic, load at $2000-$4000 to start with
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;===================
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;c64:
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;.incbin "c64.img"
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;c64_end:
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;=========================================================
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNn Nothing
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnNnNnTtttGgggNnNnNnNnNnNnNnNn 16= 4W
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; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnNnNnNnTtttNnGgggNnNnNnNnNnNnLll 15= 6W
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnNnTtttNnNnGgggNnNnNnNnNnNnNn 14= 8W
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; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnNnNnTtttNnNnNnGgggNnNnNnNnNnLll 13=10W
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnTtttNnNnNnNnGgggNnNnNnNnNnNn 12=12W
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; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnNnTtttNnNnNnNnNnGgggNnNnNnNnLll 11=14W
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnTtttNnNnNnNnNnNnGgggNnNnNnNnNn 10=16W
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; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnTtttNnNnNnNnNnNnNnGgggNnNnNnLll 9=18W
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnTtttNnNnNnNnNnNnNnNnGgggNnNnNnNn 8=20W
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; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnTtttNnNnNnNnNnNnNnNnNnGgggNnNnLll 7=22W
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnTtttNnNnNnNnNnNnNnNnNnNnGgggNnNnNn 6=24W
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; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnTtttNnNnNnNnNnNnNnNnNnNnNnGgggNnLll 5=26W
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnTtttNnNnNnNnNnNnNnNnNnNnNnNnGgggNnNn 4=28W
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; DdBbbNnNnNnNnNnNnNnNnNnLl lNnTtttNnNnNnNnNnNnNnNnNnNnNnNnNnGgggLll 3=30W
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; DdBbbNnNnNnNnNnNnNnNnNnNn NnTtttNnNnNnNnNnNnNnNnNnNnNnNnNnNnGgggNn 2=32W
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; nLllDdBbbNnNnNnNnNnNnLllN nTtttNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnGgggN NOPE
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; DdBbbNnNnNnNnNnNnNnNnNnNn TtttNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnGggg 0=36W
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;===========================================
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; c64_kill_time
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;===========================================
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; do nothing but blink cursor
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; 192 * 65 = 12480 cycles
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; - 3 jsr in
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; -3 jmp back
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; +13 to match split
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; ========
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; 12487
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c64_kill_time:
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; Try X=165 Y=15 cycles=12466 R8
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; Try X=33 Y=73 cycles=12484 R3
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lda $0
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ldy #73 ; 2
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loopc6a:ldx #33 ; 2
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loopc6b:dex ; 2
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bne loopc6b ; 2nt/3
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dey ; 2
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bne loopc6a ; 2nt/3
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jmp c64_done_screen ; 3
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;.align $100
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apple2_text:
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.byte 16,0
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.asciiz "APPLE ]["
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.byte 4,20
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.asciiz "NONE OF THIS SHOULD BE POSSIBLE,"
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.byte 5,21
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.asciiz "RACING THE BEAM TO THE EXTREME"
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; NOTE: Needs to start at least 15 bytes into the page
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c64_multiples:
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.byte 184,184
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.byte 184,184,184,184,184,184,184,184
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.byte 161,138,115, 92, 69 ,46,23, 0
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.byte 0,0,0,0,0,0,0,0
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; end is c64_multiples+24
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