mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-27 17:29:49 +00:00
245 lines
4.1 KiB
ArmAsm
245 lines
4.1 KiB
ArmAsm
; Display Starring Message
|
|
|
|
; 1st screen = triple page flip
|
|
; 2nd/3rd = split low/hires
|
|
|
|
|
|
starring:
|
|
|
|
;===================
|
|
; init screen
|
|
jsr TEXT
|
|
jsr HOME
|
|
bit KEYRESET
|
|
|
|
;===================
|
|
; init vars
|
|
|
|
lda #0
|
|
sta FRAME
|
|
sta DRAW_PAGE
|
|
|
|
;=============================
|
|
; Load graphic hgr
|
|
|
|
lda #<starring3
|
|
sta LZ4_SRC
|
|
lda #>starring3
|
|
sta LZ4_SRC+1
|
|
|
|
lda #<(starring3_end-8) ; skip checksum at end
|
|
sta LZ4_END
|
|
lda #>(starring3_end-8) ; skip checksum at end
|
|
sta LZ4_END+1
|
|
|
|
lda #<$2000
|
|
sta LZ4_DST
|
|
lda #>$2000
|
|
sta LZ4_DST+1
|
|
|
|
jsr lz4_decode
|
|
|
|
|
|
;=============================
|
|
; Load graphic page0
|
|
|
|
lda #$0c
|
|
sta BASH
|
|
lda #$00
|
|
sta BASL ; load image to $c00
|
|
|
|
|
|
lda #<starring1
|
|
sta GBASL
|
|
lda #>starring1
|
|
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 #<starring2
|
|
sta GBASL
|
|
lda #>starring2
|
|
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
|
|
stloopA:ldx #9 ; 2
|
|
stloopB:dex ; 2
|
|
bne stloopB ; 2nt/3
|
|
dey ; 2
|
|
bne stloopA ; 2nt/3
|
|
|
|
jmp st_display_loop
|
|
.align $100
|
|
|
|
;================================================
|
|
; Starring Loop
|
|
;================================================
|
|
; just kill time, 65*192 = 12480
|
|
|
|
st_display_loop:
|
|
|
|
; Try X=15 Y=154 cycles=12475 R5
|
|
|
|
nop ; 2
|
|
lda $0 ; 3
|
|
|
|
ldy #154 ; 2
|
|
suloop1:ldx #15 ; 2
|
|
suloop2:dex ; 2
|
|
bne suloop2 ; 2nt/3
|
|
dey ; 2
|
|
bne suloop1 ; 2nt/3
|
|
|
|
;======================================================
|
|
; We have 4550 cycles in the vblank, use them wisely
|
|
;======================================================
|
|
|
|
|
|
; we want to flip between GR Page0, GR Page1, HGR Page0
|
|
; we want to flip at roughly 3Hz, so every 20 times through
|
|
; what if 16, for power-of-two easiness? 3.75Hz?
|
|
|
|
; FRAME== 0 GR/PAGE0
|
|
; FRAME==20 GR/PAGE1
|
|
; FRAME==40 HGR/PAGE0
|
|
; FRAME==60 reset
|
|
|
|
; default = 13+5+5+7 = 30
|
|
; sixty = 13+17 = 30
|
|
; forty = 13+5+12 = 30
|
|
; twenty = 13+5+5+7 = 30
|
|
|
|
|
|
inc FRAME ; 5
|
|
lda FRAME ; 3
|
|
cmp #60 ; 2
|
|
bne st_not_sixty ; 3
|
|
;===========
|
|
; 13
|
|
|
|
st_sixty: ; -1
|
|
lda #0 ; wrap frame counter ; 2
|
|
sta FRAME ; 3
|
|
|
|
bit LORES ; 4
|
|
bit PAGE0 ; 4
|
|
nop ; 2
|
|
jmp done_st_vblank ; 3
|
|
;===========
|
|
; 17
|
|
|
|
st_not_sixty:
|
|
cmp #20 ; 2
|
|
bne st_not_twenty ; 3
|
|
;============
|
|
; 5
|
|
|
|
st_twenty: ; -1
|
|
bit LORES ; 4
|
|
nop ; 2
|
|
st_seven_cycles:
|
|
bit PAGE1 ; 2C 55 C0, 55C0 = EOR $20,X (4 cyc) ; 4
|
|
jmp done_st_vblank ; 3
|
|
;============
|
|
; 12
|
|
|
|
st_not_twenty:
|
|
cmp #40 ; 2
|
|
bne st_seven_cycles+1 ; 3
|
|
;============
|
|
; 5
|
|
|
|
st_forty: ; -1
|
|
bit HIRES ; 4
|
|
bit PAGE0 ; 4
|
|
|
|
;============
|
|
; 7
|
|
done_st_vblank:
|
|
|
|
; do_nothing should be 4550
|
|
; -10 keypress
|
|
; -30 page flipping
|
|
; ===========
|
|
; 4407
|
|
|
|
; Try X=99 Y=9 cycles=4510
|
|
|
|
ldy #9 ; 2
|
|
stloop1:ldx #99 ; 2
|
|
stloop2:dex ; 2
|
|
bne stloop2 ; 2nt/3
|
|
dey ; 2
|
|
bne stloop1 ; 2nt/3
|
|
|
|
lda KEYPRESS ; 4
|
|
bpl st_no_keypress ; 3
|
|
|
|
jmp st_start_over
|
|
st_no_keypress:
|
|
|
|
jmp st_display_loop ; 3
|
|
|
|
st_start_over:
|
|
bit KEYRESET ; clear keypress ; 4
|
|
rts ; 6
|
|
|
|
.include "starring1.inc"
|
|
.include "starring2.inc"
|
|
|
|
starring3:
|
|
.incbin "starring3.img.lz4",11
|
|
starring3_end:
|