Posted By
Degauss
on 2008-02-08
06:12:11
|  Re: plus4emu 1.2.5.1
Hi Istvan!
At the moment, i won't get fed up by your test-images. There's some interesting progress in there 
In a post earlier you stated that it might be possible to modify x-scroll and bg/fg-colors for both lines. I didn't look at your code, but my display-kernel didn't allow this because i was running out of cycles. I could only set two registers in the second line where i would have needed three changes. I simply decided what register-change results in less errors.
My display kernel looks like this:
------------------------
LDA ??
STA FF14
LDA ??
STA FF06 ; DFLI-stuff completed
LDA ??
STA FF07 ; first x-scroll
LDA ??
STA FF16 ; fg-color
LDA ??
STA FF15 ; bg-color
NOP ; argh. this could be useful if it was LDX/LDY, but i didn't find a way
; would be HARD to manage anyway
LDA ??
STA FF16/FF07 ; either this...
LDA ??
STA FF15/FF07 ; ... or that STA *can* be rewired to FF07
------------------------
Due to the fact that the overscan-images forced me to scatter the display-code around in memory, i needed special lines that could JMP instead of the last STA (or: modify FF1D). These are situations where i couldn't even have a second register-change in the second line.
Did you find a way to modify all three registers in all three lines? (Seems nobody likes it, but the FF07-trick helps a lot with error-reduction)
Best Regards
Degauss/TEK
p.s.: You asked what features would probably be interesting. I have to second Luca that straight (Multi)-Boticelli and Charset conversions are very very valuable. A more "feature" is quite common from C64-FLI-Paint-Programs: Interlaced Pictures are allowed to use the same Videomatrices for the odd and even planes. Quite obvious: It saves a lot of memory!
p.p.s.: Don't take it personally, but i think you're the first poster in a forum who never uses salutations at the beginning of a post. Try "Hello!"
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