basic: update par_bot
This commit is contained in:
Vince Weaver
parent
6aa3e56252
commit
4a1a6e6126
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@ -1,2 +1,2 @@
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1FORI=0TO126:POKE889+I,4*PEEK(2125+I)-204+(PEEK(2252+I/3)-35)/4^(I-INT(I/3)*3):NEXT
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2&"/@q<GcY2ThjmRkEIkEPm\h[r;CE\aH_LE/SrP6U8DqY<9GqT0X<Y2TrAYhmTkTDh;3k3]ETr=Xl`QqQ8M&Aq=4o+[<TrAPjmIoU0K3=p=5o4V8Tq\rU<U/`e7^?REQ3S+4LLP49K'37Q/08V4#4>J3'3Z5X$G$GPG@#@',C#5&
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1FORI=0TO124:POKE891+I,4*PEEK(2125+I)-204+(PEEK(2250+I/3)-35)/4^(I-INT(I/3)*3):NEXT
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2&"/@q<GcY2ThjmRkEIkEPm\jCEA\aHcMA3TdX8I8DdY<4KrQ<[;]3TrAXlnIoU=p=3o4YETrAYelToU9H2Dp=4k3];Tr=Xl`QqQ8M&Aq=5o'Z9Pq\iU<U7be7^?WFN3S+4LLP4D5#4\UW70*$'P@%4#@.8*3)3Y5Y$W4G#%#2
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@ -16,7 +16,7 @@ paralax.dsk: HELLO BOXES BOXES_BOT LARGE LARGE_BOT PAR PAR_BOT
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$(DOS33) -y paralax.dsk BSAVE -a 0xc00 LARGE
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$(DOS33) -y paralax.dsk BSAVE -a 0x386 LARGE_BOT
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$(DOS33) -y paralax.dsk BSAVE -a 0xc00 PAR
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$(DOS33) -y paralax.dsk BSAVE -a 0x379 PAR_BOT
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$(DOS33) -y paralax.dsk BSAVE -a 0x37B PAR_BOT
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###
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@ -64,7 +64,7 @@ large_bot.o: large_bot.s
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###
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PAR_BOT: par_bot.o
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ld65 -o PAR_BOT par_bot.o -C $(LINKER_DIR)/apple2_379.inc
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ld65 -o PAR_BOT par_bot.o -C $(LINKER_DIR)/apple2_37b.inc
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par_bot.o: par_bot.s
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ca65 -o par_bot.o par_bot.s -l par_bot.lst
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@ -6,8 +6,6 @@
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; Zero Page
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GBASL = $26
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GBASH = $27
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H2 = $2C
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COLOR = $30
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FRAME = $EA
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FRAME2 = $EB
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@ -19,8 +17,6 @@ COLORS = $FC
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PAGE = $FD
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; Soft Switches
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KEYPRESS= $C000
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KEYRESET= $C010
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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PAGE1 = $C054 ; Page1
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@ -29,94 +25,74 @@ LORES = $C056 ; Enable LORES graphics
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; ROM routines
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PLOT = $F800 ; plot, horiz=y, vert=A (A trashed, XY Saved)
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SETCOL = $F864
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GBASCALC= $F847 ;; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
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GBASCALC= $F847 ; take Y-coord/2 in A, put address in GBASL/H ( a trashed, C clear)
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SETGR = $FB40
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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HLINE = $F819
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parallax:
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;===================
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; init screen
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jsr SETGR ; 3
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bit FULLGR ; 3
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jsr SETGR ; lores graphics
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bit FULLGR ; full screen
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lda #$0
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lda #$0 ; start on page1
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sta PAGE
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parallax_forever:
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inc FRAME ; 2
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lda FRAME
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inc FRAME ; increment frame
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lda FRAME ; also have frame/2 and frame/4
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lsr
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sta FRAME2
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lsr
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sta FRAME4
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;========================
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; update color
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lda FRAME
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; lsr
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; lsr
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; lsr
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; lsr
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; lsr
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; and #$3
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; tax
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; lda colors,X
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; sta COLORS
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;==========================
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; flip page
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lda PAGE
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pha
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lda PAGE ; get current page
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pha ; save for later
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lsr
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lsr ; switch visible page
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lsr
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tay
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lda PAGE1,Y
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pla
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pla ; save old draw page
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eor #$4
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eor #$4 ; toggle to other draw page
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sta PAGE
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;========================
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; setup for 23 lines
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ldx #23 ; 2
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ldx #23 ; 23 lines (double high)
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yloop:
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;==============
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; point GBASL/GBSAH to current line
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txa
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txa ; get line addr in GBASL/H
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jsr GBASCALC
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lda GBASH
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clc
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adc PAGE
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adc PAGE ; adjust for page
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sta GBASH
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;==============
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; current column (work backwards)
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ldy #39 ; 2
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ldy #39
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xloop:
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lda #0
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lda #0 ; default color black
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sta COLORS
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; calculate colors
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@ -126,7 +102,7 @@ xloop:
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;===========================
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; SMALL
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sec ; subtract frame from Y
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sec ; subtract frame from Y
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tya
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sbc FRAME4
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@ -196,30 +172,20 @@ skip_color_large:
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; actually draw color
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lda COLORS
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lda COLORS ; store out pixel
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sta (GBASL),Y
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dey ; 1
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bpl xloop ; 2
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dex ; 1
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bpl yloop ; 2
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bmi parallax_forever ; 2
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; 00 = right
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; 01 = up
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; 10 = left
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; 11 = down
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; adc = $65
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; sbc = $E5
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dey ; loop for X-coord
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bpl xloop ;
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dex ; loop for Y-coord
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bpl yloop ;
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bmi parallax_forever ; bra
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; for bot
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; $3F5 - 127 + 3 = $379
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; $3F5 - 125 + 3 = $37B
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jmp parallax
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@ -0,0 +1,12 @@
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MEMORY {
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ZP: start = $00, size = $1A, type = rw;
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RAM: start = $37B, 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 = zp;
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}
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