2022-05-14 03:37:13 +00:00
|
|
|
; random scroll bot 128
|
|
|
|
|
|
|
|
|
|
; 141 bytes -- bot version
|
|
|
|
|
; 138 bytes -- no need for back jump
|
|
|
|
|
; 140 bytes -- load at 0x70
|
|
|
|
|
; 134 bytes -- enforce ZP addresses
|
|
|
|
|
; 133 bytes -- convert JMP to BPL
|
|
|
|
|
; 131 bytes -- make OUTL live in program
|
|
|
|
|
; 130 bytes -- use EOR instead of ADD
|
|
|
|
|
; 127 bytes -- don't wrap pattern lookup at 8
|
|
|
|
|
; 126 bytes -- use X for loop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
; by Vince `deater` Weaver
|
|
|
|
|
|
2022-05-18 13:07:38 +00:00
|
|
|
SPEAKER = $C030
|
2022-05-14 03:37:13 +00:00
|
|
|
SET_GR = $C050
|
|
|
|
|
SET_TEXT = $C051
|
|
|
|
|
FULLGR = $C052
|
|
|
|
|
PAGE1 = $C054
|
|
|
|
|
PAGE2 = $C055
|
|
|
|
|
LORES = $C056 ; Enable LORES graphics
|
|
|
|
|
|
|
|
|
|
HGR2 = $F3D8
|
|
|
|
|
PLOT = $F800 ; PLOT AT Y,A (A colors output, Y preserved)
|
|
|
|
|
GBASCALC = $F847 ; Y in A, put addr in GBASL/GBASH
|
|
|
|
|
SETGR = $FB40
|
|
|
|
|
WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
|
|
|
|
|
|
|
|
|
|
GBASL = $26
|
|
|
|
|
GBASH = $27
|
|
|
|
|
|
|
|
|
|
OUTL = $74
|
|
|
|
|
OUTH = $75
|
|
|
|
|
|
2022-05-20 03:20:44 +00:00
|
|
|
FRAME = $6D
|
2022-05-14 03:37:13 +00:00
|
|
|
PAGE = $6E
|
|
|
|
|
LINE = $6F
|
|
|
|
|
|
2022-05-20 03:20:44 +00:00
|
|
|
pattern1 = $d000 ; location in memory
|
2022-05-14 03:37:13 +00:00
|
|
|
|
|
|
|
|
.zeropage
|
|
|
|
|
.globalzp pattern_smc
|
|
|
|
|
.globalzp bitmap
|
|
|
|
|
.globalzp bitmap2
|
|
|
|
|
.globalzp inner_loop_smc
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
random:
|
|
|
|
|
|
|
|
|
|
jsr SETGR ; set LORES ; 70 71 72
|
|
|
|
|
|
|
|
|
|
lda #0 ; also OUTL=0/OUTH ; 73 74
|
|
|
|
|
|
|
|
|
|
bit FULLGR ; set FULL 48x40 ; 75 76 77
|
|
|
|
|
|
|
|
|
|
main_loop:
|
|
|
|
|
sta PAGE ; start at page 1
|
|
|
|
|
|
|
|
|
|
asl ; make OUTH $4 or $8 depending on value in PAGE
|
|
|
|
|
; which we have in A above or at end of loop
|
|
|
|
|
asl ; C is 0
|
|
|
|
|
adc #4
|
|
|
|
|
|
|
|
|
|
sta OUTH
|
|
|
|
|
|
2022-05-23 13:00:01 +00:00
|
|
|
; bit SPEAKER
|
2022-05-18 13:07:38 +00:00
|
|
|
|
2022-05-20 03:20:44 +00:00
|
|
|
lda #100
|
|
|
|
|
jsr WAIT
|
2022-05-14 03:37:13 +00:00
|
|
|
|
2022-05-20 03:20:44 +00:00
|
|
|
inc FRAME
|
|
|
|
|
|
|
|
|
|
lda FRAME
|
|
|
|
|
and #$3f
|
|
|
|
|
bne no_inc_bg
|
|
|
|
|
|
|
|
|
|
inc pattern_smc+2
|
|
|
|
|
|
|
|
|
|
no_inc_bg:
|
2022-05-14 03:37:13 +00:00
|
|
|
|
|
|
|
|
;============================
|
|
|
|
|
; draw an interleaved line
|
|
|
|
|
full_loop:
|
|
|
|
|
ldx #3
|
|
|
|
|
|
|
|
|
|
line_loop:
|
|
|
|
|
ldy #119
|
|
|
|
|
|
|
|
|
|
screen_loop:
|
|
|
|
|
|
|
|
|
|
tya ; extrapolate X from Y
|
|
|
|
|
; and #$7 ; could be bigger?
|
|
|
|
|
; tax
|
|
|
|
|
|
|
|
|
|
pattern_smc:
|
|
|
|
|
lda pattern1,Y
|
|
|
|
|
|
|
|
|
|
inner_loop_smc:
|
|
|
|
|
|
|
|
|
|
sta (OUTL),Y
|
|
|
|
|
|
|
|
|
|
dey
|
|
|
|
|
bpl screen_loop
|
|
|
|
|
|
|
|
|
|
;=================================
|
|
|
|
|
; move to next pattern
|
|
|
|
|
|
|
|
|
|
scroll_pattern:
|
|
|
|
|
clc
|
|
|
|
|
lda pattern_smc+1
|
|
|
|
|
adc #8
|
|
|
|
|
and #$1f
|
|
|
|
|
sta pattern_smc+1
|
|
|
|
|
|
|
|
|
|
; move to next line by adding $80
|
|
|
|
|
; we save a byte by using EOR instead
|
|
|
|
|
|
|
|
|
|
lda OUTL
|
|
|
|
|
eor #$80 ; add $80
|
|
|
|
|
sta OUTL
|
|
|
|
|
|
|
|
|
|
bne line_loop
|
|
|
|
|
|
|
|
|
|
; we overflowed, so increment OUTH
|
|
|
|
|
|
|
|
|
|
inc OUTH
|
|
|
|
|
|
|
|
|
|
; lda OUTH ; check if at end
|
|
|
|
|
; and #$3
|
|
|
|
|
; bne line_loop
|
|
|
|
|
|
|
|
|
|
dex
|
|
|
|
|
bpl line_loop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
done_bg:
|
|
|
|
|
|
|
|
|
|
;=======================================
|
|
|
|
|
; done drawing frame
|
|
|
|
|
;=======================================
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;======================
|
|
|
|
|
; draw bitmap
|
|
|
|
|
|
|
|
|
|
ldx #7
|
|
|
|
|
boxloop:
|
|
|
|
|
txa
|
|
|
|
|
jsr GBASCALC ; calc address of X
|
|
|
|
|
; note we center to middle of screen
|
|
|
|
|
; by noting the middle 8 lines
|
|
|
|
|
; are offset by $28 from first 8 lines
|
|
|
|
|
|
|
|
|
|
; GBASL is in A at this point
|
|
|
|
|
|
|
|
|
|
clc
|
|
|
|
|
adc #12+$28
|
|
|
|
|
sta GBASL ; center x-coord and y-coord at same time
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
lda PAGE ; want to add 0 or 4 (not 0 or 1)
|
|
|
|
|
asl
|
|
|
|
|
asl ; this sets C to 0
|
|
|
|
|
adc GBASH
|
|
|
|
|
sta GBASH
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
ldy #15
|
|
|
|
|
draw_line_loop:
|
|
|
|
|
|
|
|
|
|
lda bitmap2,X ; get low bit of bitmap2 into carry
|
|
|
|
|
lsr
|
|
|
|
|
|
|
|
|
|
lda #$00 ; black is default color
|
|
|
|
|
|
|
|
|
|
ror bitmap,X ; 16-bit rotate (in memory)
|
|
|
|
|
ror bitmap2,X
|
|
|
|
|
|
|
|
|
|
bcc its_black
|
|
|
|
|
|
|
|
|
|
lda #$ff
|
|
|
|
|
its_black:
|
|
|
|
|
sta (GBASL),Y ; partway down screen
|
|
|
|
|
|
|
|
|
|
dey
|
|
|
|
|
bpl draw_line_loop
|
|
|
|
|
|
|
|
|
|
dex
|
|
|
|
|
bpl boxloop
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;=========================
|
|
|
|
|
; scroll one line
|
|
|
|
|
|
|
|
|
|
; to scroll up need to add 8?
|
|
|
|
|
inc pattern_smc+1
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
; switch page
|
|
|
|
|
lda PAGE
|
|
|
|
|
|
|
|
|
|
tax
|
|
|
|
|
ldy PAGE1,X ; flip page
|
|
|
|
|
|
|
|
|
|
eor #$1
|
|
|
|
|
|
|
|
|
|
bpl main_loop ; bra
|
|
|
|
|
|
|
|
|
|
|
2022-05-20 04:17:22 +00:00
|
|
|
; updated desire logo thanks to
|
|
|
|
|
|
2022-05-14 03:37:13 +00:00
|
|
|
;012|456|012|456|
|
|
|
|
|
;@@@@@@@@@@@@@@@@'
|
2022-05-20 04:17:22 +00:00
|
|
|
;@ @@ @ @@'
|
|
|
|
|
;@@@ @@@@@@@@ @'
|
|
|
|
|
;@ @ @ @ @@'
|
|
|
|
|
;@ @ @@@ @@@ @'
|
|
|
|
|
;@ @ @ @ @'
|
2022-05-14 03:37:13 +00:00
|
|
|
;@@@@@@@@@@@@@@@@'
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
bitmap:
|
|
|
|
|
.byte $FF ;,$FF
|
2022-05-20 04:17:22 +00:00
|
|
|
.byte $8C ;,$23
|
|
|
|
|
.byte $E7 ;,$F9
|
|
|
|
|
.byte $A4 ;,$23
|
|
|
|
|
.byte $A7 ;,$39
|
|
|
|
|
.byte $84 ;,$29
|
2022-05-14 03:37:13 +00:00
|
|
|
.byte $FF ;,$FF
|
|
|
|
|
.byte $00 ;,$00
|
|
|
|
|
|
|
|
|
|
bitmap2:
|
|
|
|
|
.byte $FF
|
2022-05-20 04:17:22 +00:00
|
|
|
.byte $23
|
|
|
|
|
.byte $F9
|
|
|
|
|
|
|
|
|
|
.byte $23
|
|
|
|
|
.byte $39
|
|
|
|
|
.byte $29
|
2022-05-14 03:37:13 +00:00
|
|
|
.byte $FF
|
|
|
|
|
.byte $00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2022-05-20 04:17:22 +00:00
|
|
|
;012|456|012|456|
|
|
|
|
|
;@@@@@@@@@@@@@@@@'
|
|
|
|
|
;@@@@ @ @@@@@@'
|
|
|
|
|
;@@@@ @ @@@@@@@@@'
|
|
|
|
|
;@ @ @ @'
|
|
|
|
|
;@ @@ @@@@ @ @@@@'
|
|
|
|
|
;@ @ @ @@@@'
|
|
|
|
|
;@@@@@@@@@@@@@@@@'
|
|
|
|
|
;
|
|
|
|
|
|
|
|
|
|
;bitmap:
|
|
|
|
|
; .byte $FF ;,$FF
|
|
|
|
|
; .byte $F4 ;,$3F
|
|
|
|
|
; .byte $F5 ;,$FF
|
|
|
|
|
; .byte $84 ;,$21
|
|
|
|
|
; .byte $B7 ;,$AF
|
|
|
|
|
; .byte $84 ;,$2F
|
|
|
|
|
; .byte $FF ;,$FF
|
|
|
|
|
; .byte $00 ;,$00
|
|
|
|
|
|
|
|
|
|
;bitmap2:
|
|
|
|
|
; .byte $FF
|
|
|
|
|
; .byte $3F
|
|
|
|
|
; .byte $FF
|
|
|
|
|
; .byte $21
|
|
|
|
|
; .byte $AF
|
|
|
|
|
; .byte $2F
|
|
|
|
|
; .byte $FF
|
|
|
|
|
; .byte $00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2022-05-14 03:37:13 +00:00
|
|
|
;01234567|01234567
|
|
|
|
|
;
|
|
|
|
|
; @@@@ @@@@
|
|
|
|
|
; @@ @@
|
|
|
|
|
; @@ @@
|
|
|
|
|
; @@ @@
|
|
|
|
|
; @@@@ @@@@
|
|
|
|
|
;
|
|
|
|
|
;@@@@@@@@@@@@@@@@
|
|
|
|
|
.if 0
|
|
|
|
|
bitmap:
|
|
|
|
|
.byte $FF ;,$FF
|
|
|
|
|
.byte $E1 ;,$87
|
|
|
|
|
.byte $F9 ;,$9F
|
|
|
|
|
.byte $F9 ;,$9F
|
|
|
|
|
.byte $F9 ;,$9F
|
|
|
|
|
.byte $E1 ;,$87
|
|
|
|
|
.byte $FF ;,$FF
|
|
|
|
|
.byte $00 ;,$00
|
|
|
|
|
|
|
|
|
|
bitmap2:
|
|
|
|
|
.byte $FF
|
|
|
|
|
.byte $87
|
|
|
|
|
.byte $9F
|
|
|
|
|
.byte $9F
|
|
|
|
|
.byte $9F
|
|
|
|
|
.byte $87
|
|
|
|
|
.byte $FF
|
|
|
|
|
.byte $00
|
|
|
|
|
.endif
|
