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2011-05-03 14:09

madman68
Account closed

Registered: Apr 2011
Posts: 20

Rasterroutine found in the good old days :)

Hello all,

I have just picked up coding again after 20 jears and i must say that i forgot a lot about it...:)

What i have done is took an old demo i wrote back then and i ripped this piece out of it.

This routine allows to split up the screen in as many parts as you like and jump in each part to a subroutine which does what u like.

It monitors the irq flag at D019 and changes the raster pos bij a row of variables .

Is this a useful routine to make some demos or is it already
to be modified?

Thanx for your respond,

an old beginner

Here it is (i almost forgot hihi):

; 10 SYS (49152)
*=$0800

BYTE $00, $0F, $08, $0A, $00, $9E, $20, $28, $34, $39, $31, $35, $32, $29, $00, $00, $00

*=$c000

lda#$07
sta$10
sei
lda#$01
sta$d01a
lda#$1b
sta$d011
lda#<irq
sta$0314
lda#>irq
sta$0315
lda#$7e
sta$dc0d

cli
loopie jmploopie

irq lda$d019
sta$d019
and#$01
bnehop
jmp$ea81

hop dec$10
lda$10
bplsplitter
lda#$07
sta$10

splitter tax
ldaraster,x
sta$d012
ldacolor,x
sta$d020
ldasubrouthi,x
stajmpsub+2
ldasubroutlo,x
stajmpsub+1

jmpsub jsr$c200

einde jmp$ea81

raster byte $f0,$d0,$a0,$90,$70,$50,$30,$10

color byte $03,$02,$01,$00,$06,$08,$07,$05

subrouthi byte $c2,$c3,$c4,$c5,$c6,$c7,$c8,$c9

subroutlo byte $00,$00,$00,$00,$00,$00,$00,$00,$00

*=$c200
lda#$00
sta$d021
rts

*=$c300
lda#$04
sta$d021
rts

*=$c400
lda#$05
sta$d021
rts

*=$c500
lda#$07
sta$d021

*=$c600
lda#$09
sta$d021
rts

*=$c700
lda#$0c
sta$d021
rts

*=$c800
lda#$0f
sta$d021
rts

*=$c900
lda#$00
sta$d021
rts

2011-05-03 14:29

Oswald

Registered: Apr 2002
Posts: 5094

and#$01
bnehop

this check is never done in demos, because you know no other irq source is present :)

I have learned to code things like this when I was 14-15, so I dont think its very useful for guys other than beginners.

2011-05-03 14:32

madman68
Account closed

Registered: Apr 2011
Posts: 20

you mean that $d019 could be triggerd by other sources too and this would mess up the lot?

If so, what is a better method?
the double irq routine?

2011-05-03 16:23

Oswald

Registered: Apr 2002
Posts: 5094

please do your homework, and understand why and what happend with the d019 handling. :)

http://codebase64.org/doku.php?id=base:introduction_to_raster_i..
http://unusedino.de/ec64/technical/aay/c64/vic25.htm

2011-05-03 16:37

madman68
Account closed

Registered: Apr 2011
Posts: 20

Im already working on that, thank for comment AND links.

can u give me the home of the second link where all adresses are explained like that?

that would be awesome!

2011-05-03 16:40

Celtic
Administrator

Registered: Jan 2002
Posts: 807

and why not contact Terric, the guys in this thread: http://noname.c64.org/csdb/forums/?roomid=7&topicid=84209&first..

he is offering help to coders, you need it, so a match made in heaven :)

2011-05-03 16:44

madman68
Account closed

Registered: Apr 2011
Posts: 20

You will be in Heaven too for this Celtic :))

Asswhipe that i am, forget about the home of the second link i already got it , Thankx!

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