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lovebyte: extended deadline?
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12
demos/lovebyte2024/hhhh_16/apple2_e7_zp.inc
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demos/lovebyte2024/hhhh_16/apple2_e7_zp.inc
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MEMORY {
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ZP: start = $E7, size = $90, type = rw;
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RAM: start = $E7, size = $8E00, file = %O;
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}
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SEGMENTS {
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CODE: load = RAM, type = ro;
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#RODATA: load = RAM, type = ro;
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#DATA: load = RAM, type = rw;
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#BSS: load = RAM, type = bss, define = yes;
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ZEROPAGE: load = ZP, type = ro;
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}
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9
demos/lovebyte2024/hhhh_16/file_id.diz
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demos/lovebyte2024/hhhh_16/file_id.diz
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-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-==-
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hhhh_16
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--------------------------------------
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Hi-res Xdraw Pattern
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by Deater / dSr
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16-byte Intro for Apple II
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Lovebyte 2024
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--------------------------------------
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56
demos/lovebyte2024/hhhh_16/hhhh_16.s
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demos/lovebyte2024/hhhh_16/hhhh_16.s
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; 16B interesting XDRAW pattern
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; it starts out sorta looking like hhhh? Or is it just me?
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; by Vince `deater` Weaver / dSr
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; for Lovebyte 2024
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; zero page locations
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GBASL = $26
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GBASH = $27
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HGR_SCALE = $E7
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HGR_COLLISIONS = $EA
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; ROM locations
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HGR2 = $F3D8
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HPOSN = $F411
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XDRAW0 = $F65D
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XDRAW1 = $F661
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HPLOT0 = $F457
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field15:
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; we load at zero page $E7 which is HGR_SCALE
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; this means the scale is $20 (JSR)
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; $20 $D8 $F3
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jsr HGR2 ; Hi-res, full screen ; 3
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; Y=0, A=0 after this call
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; A and Y are 0 here.
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; X is left behind by the boot process?
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; set GBASL/GBASH
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; we really have to call this, otherwise it won't run
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; on some real hardware depending on setup of zero page at boot
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jsr HPLOT0 ; set screen position to X= (y,x) Y=(a)
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; saves X,Y,A to zero page
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; after Y= orig X/7
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; A and X are ??
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tiny_loop:
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lda #$E3 ; ROT=$E3
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tay ;
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dey ; Y=$E2
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tax ; X=$E3
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jsr XDRAW0 ; XDRAW, A =ROTATE, X/Y = point to shape
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; Both A and X are 0 at exit
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; Z flag set on exit
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; Y varies
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beq tiny_loop ; bra
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3
demos/lovebyte2024/hhhh_16/monitor.txt
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3
demos/lovebyte2024/hhhh_16/monitor.txt
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CALL -151
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E7: 20 D8 F3 20 57 F4 A9 E3 A8 88 AA 20 5D F6 F0 F6
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E7G
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