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Forums > C64 Coding > help with delay table making tech tech
2012-08-13 14:53
Dr.j

Registered: Feb 2003
Posts: 277
help with delay table making tech tech

Hey there again. i want to do a little tech tech effect.
i think i manage Ok with the charsets (took me some time to
arrange right the chars) and i have $d018 and $d016 tables
the main problem is now.. Delay tables . i use this routine
what is the best technique to do "Fine tune" the delays?
i will gladly hear your ideas to do fast delay tables.
i first tried to replace $d016+$d018 with $d021 but it didnt help me much. please don't send me to "missing cycles" article..hehe . btw i don't have any problems to make "rasters" delays but here its different.
ldx #$00
loop:
lda d018tab,x
sta $d018
lda d016,x
sta $d016
ldy delaytab,x
dey
bne *-1
inx
cpx #$2f
bne loop

 
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2012-08-15 06:06
tlr

Registered: Sep 2003
Posts: 1790
If you combine the screen method with the charset method you could do a much wider tech-tech without requiring too many charsets.
2012-08-15 07:00
Conjuror

Registered: Aug 2004
Posts: 168
tlr: The consequence of that is the FLI bug as you need to trigger a bad-line to change the charset every line as I did here Better
2012-08-15 07:54
Radiant

Registered: Sep 2004
Posts: 639
Conjuror: Nah, if your slope isn't too steep you'd only need to update screen RAM location every 8 lines.
2012-08-15 11:21
tlr

Registered: Sep 2003
Posts: 1790
Yes, what radiantx said. I'm sure it's been done already.
2012-08-15 17:31
algorithm

Registered: May 2002
Posts: 705
I may be wrong but i believe one of the crest demos from maduplec had a part with full 320x200 tech tech utilizing the method of non drastic sine in d016 and changing d018 after 8 raster lines or so allowing the changing of msb nybble (screen ram) which allows more x positions this method

edit: Just seen that part, did not analyse the code, but that demo seems to not use full 320x200
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