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2006-11-27 22:55

General Zoff
Account closed

Registered: Dec 2004
Posts: 7

Stupid Routines ....

Found this one on one of my old work disks ...
Let's collect the most stupid routines you have written on your old C64 ... ;-)

.C:6000 78 SEI
.C:6001 A2 00 LDX #$00
.C:6003 BD 11 60 LDA $6011,X
.C:6006 9D 00 00 STA $0000,X
.C:6009 E8 INX
.C:600a E0 40 CPX #$40
.C:600c D0 F5 BNE $6003
.C:600e 4C 00 00 JMP $0000
.C:6011 2F 34 A9 RLA $A934
.C:6014 A9 EA LDA #$EA
.C:6016 8D 34 A9 STA $A934
.C:6019 F0 24 BEQ $603F
.C:601b A2 00 LDX #$00
.C:601d A9 EA LDA #$EA
.C:601f 9D 40 00 STA $0040,X
.C:6022 E8 INX
.C:6023 D0 F8 BNE $601D
.C:6025 EE 10 00 INC $0010
.C:6028 AD 10 00 LDA $0010
.C:602b C9 00 CMP #$00
.C:602d F0 0B BEQ $603A
.C:602f C9 FF CMP #$FF
.C:6031 D0 E8 BNE $601B
.C:6033 A9 00 LDA #$00
.C:6035 8D 0F 00 STA $000F
.C:6038 F0 E1 BEQ $601B
.C:603a A9 D0 LDA #$D0
.C:603c 8D 08 00 STA $0008
.C:603f A9 37 LDA #$37
.C:6041 85 01 STA $01
.C:6043 EE 20 D0 INC $D020
.C:6046 A9 34 LDA #$34
.C:6048 85 01 STA $01
.C:604a EA NOP
.C:604b EA NOP
.C:604c EA NOP
.C:604d EA NOP
.C:604e EA NOP
.C:604f EA NOP
.C:6050 EA NOP

... 42 posts hidden. Click here to view all posts....

2007-04-01 20:17

iAN CooG

Registered: May 2002
Posts: 3187

actually is
dec $d020
bne *-3

2007-04-15 21:20

Richard

Registered: Dec 2001
Posts: 621

One really stupid routine would be

LOOP INC $D030
JMP LOOP

especially on a C128 :)

2007-04-16 11:24

Style

Registered: Jun 2004
Posts: 498

Quote: Here's something probably useless, but was useful for me. Creating short term delays :)

* = $1000
SEI
DELAY LDX #$00
LOOP2 LDY #$00
LOOP1 INY
BNE LOOP1
INX
BNE LOOP2
RTS

To make things interestingly wild, or silly. Before LDX #$00 add the following:

JSR DELAY
INC $D020

JSR DELAY
INC $D020

JSR DELAY
INC $D020

JSR DELAY
INC $D020

JSR DELAY
INC $D020

JSR DELAY
INC $D020
RTS

Ive never found any use for delays of such magnitude!

What do you use them for?

Im sure you must be better off RTIing and triggering a new IRQ further down the screen?

2007-04-16 11:32

Mace

Registered: May 2002
Posts: 1799

Style, they're just stupid, hence the name of this thread ;)

2007-04-16 11:37

Style

Registered: Jun 2004
Posts: 498

he said it was useful to him! :)

2007-04-16 13:58

Mace

Registered: May 2002
Posts: 1799

Style, it's Richard.... nuff said? ;-)
Hence the name of this thread.

2007-04-16 15:45

Conrad

Registered: Nov 2006
Posts: 847

Here's a very badly coded raster-splitter routine I found in an old demo:

*=$0801
!byte $0c,$08,$00,$00,$9e,$34,$30,$39,$36

*=$1000
sei
lda #$1b
sta $d011
lda #$3b
cmp $d012
bne *-3
jsr rastersplitter
jmp *-10

rastersplitter
ldy #$00
badline ldx #$08
newline lda tbl_raster1,y
sta $d020
sta $d020
iny
dex
beq badline
lda tbl_raster2,y
sta $d021
lda tbl_raster3,y
sta $d021
lda tbl_raster4,y
sta $d021
lda $0000,y
sta $dddd
lda $0000,y
sta $dddd
cpy #$80
bcc newline
rts

*=$1100
tbl_raster1
!byte $06,$00,$06,$06,$0e,$06,$0e,$0e,$03,$0e,$03,$03,$01,$03,$01,$01
!byte $03,$01,$03,$03,$0e,$03,$0e,$0e,$06,$0e,$06,$06,$00,$06,$00,$00
!byte $06,$00,$06,$06,$0e,$06,$0e,$0e,$03,$0e,$03,$03,$01,$03,$01,$01
!byte $03,$01,$03,$03,$0e,$03,$0e,$0e,$06,$0e,$06,$06,$00,$06,$00,$00
!byte $06,$00,$06,$06,$0e,$06,$0e,$0e,$03,$0e,$03,$03,$01,$03,$01,$01
!byte $03,$01,$03,$03,$0e,$03,$0e,$0e,$06,$0e,$06,$06,$00,$06,$00,$00
!byte $06,$00,$06,$06,$0e,$06,$0e,$0e,$03,$0e,$03,$03,$01,$03,$01,$01
!byte $03,$01,$03,$03,$0e,$03,$0e,$0e,$06,$0e,$06,$06,$00,$06,$00,$00

*=$1200
tbl_raster2
!byte $00
!byte $09,$00,$09,$09,$02,$09,$02,$02,$0a,$02,$0a,$0a,$0f,$0a,$0f,$0f
!byte $07,$0f,$07,$07,$01,$07,$01,$01,$0d,$01,$0d,$0d,$03,$0e,$06,$00
!byte $09,$00,$09,$09,$02,$09,$02,$02,$0a,$02,$0a,$0a,$0f,$0a,$0f,$0f
!byte $07,$0f,$07,$07,$01,$07,$01,$01,$0d,$01,$0d,$0d,$03,$0e,$06,$00
!byte $09,$00,$09,$09,$02,$09,$02,$02,$0a,$02,$0a,$0a,$0f,$0a,$0f,$0f
!byte $07,$0f,$07,$07,$01,$07,$01,$01,$0d,$01,$0d,$0d,$03,$0e,$06,$00
!byte $09,$00,$09,$09,$02,$09,$02,$02,$0a,$02,$0a,$0a,$0f,$0a,$0f,$0f
!byte $07,$0f,$07,$07,$01,$07,$01,$01,$0d,$01,$0d,$0d,$03,$0e,$06,$00

*=$1300
tbl_raster3
!byte $00
!byte $05,$00,$05,$05,$0d,$05,$0d,$0d,$01,$0d,$01,$01,$07,$0f,$0a,$08
!byte $02,$09,$02,$08,$0a,$0f,$07,$01,$01,$01,$0d,$05,$0b,$00,$0b,$00
!byte $05,$00,$05,$05,$0d,$05,$0d,$0d,$01,$0d,$01,$01,$07,$0f,$0a,$08
!byte $02,$09,$02,$08,$0a,$0f,$07,$01,$01,$01,$0d,$05,$0b,$00,$0b,$00
!byte $05,$00,$05,$05,$0d,$05,$0d,$0d,$01,$0d,$01,$01,$07,$0f,$0a,$08
!byte $02,$09,$02,$08,$0a,$0f,$07,$01,$01,$01,$0d,$05,$0b,$00,$0b,$00
!byte $05,$00,$05,$05,$0d,$05,$0d,$0d,$01,$0d,$01,$01,$07,$0f,$0a,$08
!byte $02,$09,$02,$08,$0a,$0f,$07,$01,$01,$01,$0d,$05,$0b,$00,$0b,$00

*=$1400
tbl_raster4
!byte $00
!byte $0b,$00,$0b,$0b,$0c,$0b,$0c,$0c,$0f,$0c,$0f,$0f,$07,$0f,$07,$07
!byte $0f,$07,$0f,$0f,$0c,$0f,$0c,$0c,$0b,$0c,$0b,$0b,$00,$0b,$00,$00
!byte $0b,$00,$0b,$0b,$0c,$0b,$0c,$0c,$0f,$0c,$0f,$0f,$07,$0f,$07,$07
!byte $0f,$07,$0f,$0f,$0c,$0f,$0c,$0c,$0b,$0c,$0b,$0b,$00,$0b,$00,$00
!byte $0b,$00,$0b,$0b,$0c,$0b,$0c,$0c,$0f,$0c,$0f,$0f,$07,$0f,$07,$07
!byte $0f,$07,$0f,$0f,$0c,$0f,$0c,$0c,$0b,$0c,$0b,$0b,$00,$0b,$00,$00
!byte $0b,$00,$0b,$0b,$0c,$0b,$0c,$0c,$0f,$0c,$0f,$0f,$07,$0f,$07,$07
!byte $0f,$07,$0f,$0f,$0c,$0f,$0c,$0c,$0b,$0c,$0b,$0b,$00,$0b,$00,$00

Because of the bad lines, every 8th line is corrupted, and the splits are out of line at the top most of the screen.

BTW, the LDA$0000,y STA$dddd can be used for extra splits. But who cares? It's a crap routine :-)

2007-04-19 22:05

fenek
Account closed

Registered: Apr 2002
Posts: 3

As far as I remember this one:
- make a standard char matrix 16x16 in hires on screen
- cover it with sprites in hires (irq-multiplexer)
- draw a vector-cube as fast as you can
- inside IRQ, check a VIC-collision sprite/background register
after each 8 rasterlines lines in char<>sprites area
- one sprite which is 24x21 pixel big cover 3x3 chars
so the bits of collision register gives you info which fonts/cahrs are used by your vector and these chars should be clear :)))

It's stupid beacuse it slooow ....

.ohhh sprites should be filled by byte $ff

2007-04-20 05:17

Radiant

Registered: Sep 2004
Posts: 639

Quote:

so the bits of collision register gives you info which fonts/cahrs are used by your vector and these chars should be clear :)))

Haha. :-) Cool idea at least!

2007-04-20 08:37

Cruzer

Registered: Dec 2001
Posts: 1048

Nice idea, but performance wise I'm sure it will be more effecient to precalculate and pack the info on which areas of the object to clear/fill/skip.

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