lovebyte: extended deadline?

This commit is contained in:
Vince Weaver 2024-02-08 18:44:33 -05:00
parent afcfb55443
commit 804fb29846
4 changed files with 80 additions and 0 deletions

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MEMORY {
ZP: start = $E7, size = $90, type = rw;
RAM: start = $E7, size = $8E00, file = %O;
}
SEGMENTS {
CODE: load = RAM, type = ro;
#RODATA: load = RAM, type = ro;
#DATA: load = RAM, type = rw;
#BSS: load = RAM, type = bss, define = yes;
ZEROPAGE: load = ZP, type = ro;
}

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-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-
hhhh_16
--------------------------------------
Hi-res Xdraw Pattern
by Deater / dSr
16-byte Intro for Apple II
Lovebyte 2024
--------------------------------------

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; 16B interesting XDRAW pattern
; it starts out sorta looking like hhhh? Or is it just me?
; by Vince `deater` Weaver / dSr
; for Lovebyte 2024
; zero page locations
GBASL = $26
GBASH = $27
HGR_SCALE = $E7
HGR_COLLISIONS = $EA
; ROM locations
HGR2 = $F3D8
HPOSN = $F411
XDRAW0 = $F65D
XDRAW1 = $F661
HPLOT0 = $F457
field15:
; we load at zero page $E7 which is HGR_SCALE
; this means the scale is $20 (JSR)
; $20 $D8 $F3
jsr HGR2 ; Hi-res, full screen ; 3
; Y=0, A=0 after this call
; A and Y are 0 here.
; X is left behind by the boot process?
; set GBASL/GBASH
; we really have to call this, otherwise it won't run
; on some real hardware depending on setup of zero page at boot
jsr HPLOT0 ; set screen position to X= (y,x) Y=(a)
; saves X,Y,A to zero page
; after Y= orig X/7
; A and X are ??
tiny_loop:
lda #$E3 ; ROT=$E3
tay ;
dey ; Y=$E2
tax ; X=$E3
jsr XDRAW0 ; XDRAW, A =ROTATE, X/Y = point to shape
; Both A and X are 0 at exit
; Z flag set on exit
; Y varies
beq tiny_loop ; bra

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CALL -151
E7: 20 D8 F3 20 57 F4 A9 E3 A8 88 AA 20 5D F6 F0 F6
E7G