Apple-2-SW/dos33fsprogs
1
0
Fork 0
mirror of https://github.com/deater/dos33fsprogs.git synced 2024-12-30 22:32:48 +00:00
Code Issues Projects Releases Wiki Activity

megademo: takeoff, erase to background

Browse Source
This commit is contained in:
Vince Weaver 2018-10-19 01:02:22 -04:00
parent 61c4369797
commit 2e4fb57ae1
1 changed files with 32 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
megademo/takeoff.s
View File

@ -237,10 +237,13 @@ to_jump_table:
;============================
; state0: Draw+move Bird+Rider
;============================
; 13 + 2208 + 1365 + 3 = 3589
; 13 + 2208 + 762 + 578 + 25 + 3 = 3589
to_state0:
lda #20 ; 2
jsr gr_copy_row22 ; 6+572
lda #22 ; 2
sta YPOS ; 3
lda FRAMEH ; 3
@ -282,13 +285,36 @@ to_bwalk:
; 33 + 2175 = 2208
to_done_bwalk:
inc XPOS ; 5
lda XPOS ; 3
cmp #21 ; 2
bne to_keep_state ; 3
; -1
inc STATE ; 5
inc STATE ; 5
jmp to_done_keep_state ; 3
;========
; 12
to_keep_state:
lda $0
lda $0
lda $0
lda $0
to_done_keep_state:
; delay
; Try X=14 Y=47 cycles=3573
; Try X=67 Y=4 cycles=1365
ldy #4 ; 2
toloopV:ldx #67 ; 2
; Try X=151 Y=1 cycles=762
ldy #1 ; 2
toloopV:ldx #151 ; 2
toloopW:dex ; 2
bne toloopW ; 2nt/3
dey ; 2