mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 23:20:43 +00:00
229 lines
3.7 KiB
ArmAsm
229 lines
3.7 KiB
ArmAsm
; Display Falling Apple II and message
|
|
|
|
|
|
falling_half:
|
|
|
|
;===================
|
|
; init screen
|
|
jsr TEXT
|
|
jsr HOME
|
|
bit KEYRESET
|
|
|
|
;===================
|
|
; init vars
|
|
|
|
lda #0
|
|
sta DRAW_PAGE
|
|
sta FRAME
|
|
sta FRAMEH
|
|
|
|
;=============================
|
|
; Load graphic page0
|
|
|
|
lda #$0c
|
|
sta BASH
|
|
lda #$00
|
|
sta BASL ; load image to $c00
|
|
|
|
|
|
lda #<apple_low
|
|
sta GBASL
|
|
lda #>apple_low
|
|
sta GBASH
|
|
jsr load_rle_gr
|
|
|
|
lda #4
|
|
sta DRAW_PAGE
|
|
|
|
jsr gr_copy_to_current ; copy to page1
|
|
|
|
; GR part
|
|
bit PAGE1
|
|
bit LORES ; 4
|
|
bit SET_GR ; 4
|
|
bit FULLGR ; 4
|
|
|
|
;=============================
|
|
; Load graphic page1
|
|
|
|
lda #$0c
|
|
sta BASH
|
|
lda #$00
|
|
sta BASL ; load image to $c00
|
|
|
|
lda #<apple_high
|
|
sta GBASL
|
|
lda #>apple_high
|
|
sta GBASH
|
|
jsr load_rle_gr
|
|
|
|
lda #0
|
|
sta DRAW_PAGE
|
|
|
|
jsr gr_copy_to_current
|
|
|
|
; GR part
|
|
bit PAGE0
|
|
|
|
|
|
;==============================
|
|
; setup graphics for vapor lock
|
|
;==============================
|
|
|
|
jsr vapor_lock ; 6
|
|
|
|
; vapor lock returns with us at beginning of hsync in line
|
|
; 114 (7410 cycles), so with 5070 lines to go
|
|
|
|
jsr gr_copy_to_current ; 6+ 9292
|
|
|
|
; now we have 322 left
|
|
|
|
; GR part
|
|
bit LORES ; 4
|
|
bit SET_GR ; 4
|
|
bit FULLGR ; 4
|
|
|
|
; 322 - 12 = 310
|
|
; - 3 for jmp
|
|
; 307
|
|
|
|
; Try X=9 Y=6 cycles=307
|
|
|
|
ldy #6 ; 2
|
|
faloopA:ldx #9 ; 2
|
|
faloopB:dex ; 2
|
|
bne faloopB ; 2nt/3
|
|
dey ; 2
|
|
bne faloopA ; 2nt/3
|
|
|
|
jmp fa_display_loop ; 3
|
|
.align $100
|
|
|
|
|
|
;================================================
|
|
; Display Loop
|
|
;================================================
|
|
; each scan line 65 cycles
|
|
; 1 cycle each byte (40cycles) + 25 for horizontal
|
|
; Total of 12480 cycles to draw screen
|
|
; Vertical blank = 4550 cycles (70 scan lines)
|
|
; Total of 17030 cycles to get back to where was
|
|
|
|
|
|
; in the end, scrolling in was deemed to complex
|
|
; what we do is load both to PAGE1/PAGE2 and then
|
|
; slowly shift from all PAGE1 to PAGE1/PAGE every two scanlines
|
|
|
|
|
|
fa_display_loop:
|
|
|
|
ldy #48 ; 2
|
|
|
|
outer_loop:
|
|
|
|
bit PAGE0 ; 4
|
|
ldx #25 ; 130 cycles with PAGE0 ; 2
|
|
page0_loop: ; delay 126+bit
|
|
dex ; 2
|
|
bne page0_loop ; 2/3
|
|
|
|
|
|
bit PAGE1 ; 4
|
|
ldx #23 ; 130 cycles with PAGE1 ; 2
|
|
page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
|
|
dex ; 2
|
|
bne page1_loop ; 2/3
|
|
|
|
nop ; 2
|
|
lda DRAW_PAGE ; 3
|
|
|
|
dey ; 2
|
|
bne outer_loop ; 2/3
|
|
|
|
|
|
|
|
;======================================================
|
|
; We have 4550 cycles in the vblank, use them wisely
|
|
;======================================================
|
|
; 4550 cycles
|
|
; -1 (+1-2) from above
|
|
; -25 inc framecount
|
|
; -7 see if timeout
|
|
;-1023 play_music
|
|
; -10 keypress
|
|
;================
|
|
; 3484
|
|
|
|
jsr play_music ; 6+1017
|
|
|
|
|
|
|
|
; Try X=231 Y=3 cycles=3484
|
|
|
|
ldy #3 ; 2
|
|
faloop1:ldx #231 ; 2
|
|
faloop2:dex ; 2
|
|
bne faloop2 ; 2nt/3
|
|
dey ; 2
|
|
bne faloop1 ; 2nt/3
|
|
|
|
|
|
;========================
|
|
; Increment Frame at 20Hz
|
|
;========================
|
|
; noinc: 13+12=25
|
|
; inc: 13+12=25
|
|
inc FRAME ; 5
|
|
lda FRAME ; 3
|
|
cmp #4 ; 2
|
|
bne fa_noinc ; 3
|
|
|
|
; -1
|
|
lda #0 ; 2
|
|
sta FRAME ; 3
|
|
inc FRAMEH ; 5
|
|
jmp fa_doneinc ; 3
|
|
fa_noinc:
|
|
lda $0 ; 3
|
|
lda $0 ; 3
|
|
lda $0 ; 3
|
|
lda $0 ; 3
|
|
fa_doneinc:
|
|
|
|
|
|
;====================
|
|
; exit after 5s or so
|
|
;====================
|
|
; 7 cycles
|
|
lda FRAMEH ; 3
|
|
cmp #100 ; 2
|
|
nop
|
|
;beq fa_done ; 3
|
|
; -1
|
|
|
|
;=====================
|
|
; check for keypress
|
|
; 10 cycles
|
|
|
|
lda KEYPRESS ; 4
|
|
bpl fa_no_keypress ; 3
|
|
jmp fa_done
|
|
fa_no_keypress:
|
|
|
|
jmp fa_display_loop ; 3
|
|
|
|
fa_done:
|
|
bit KEYRESET ; clear keypress ; 4
|
|
rts ; 6
|
|
|
|
|
|
|
|
|
|
;.include "../asm_routines/gr_unrle.s"
|
|
;.include "gr_copy.s"
|
|
|
|
;.include "apple_40_96.inc"
|
|
|
|
|