Denial

i like how that thread (once again) derailed =)

i am not really interested in solutions that involve modding the hardware though... obviously then its possible (or i could just pop a custom rom into it...)

it would be so nice if you could map the e000-ffff block to ram as you can on c64.... but you cant

the ROM _does_ use decimal mode at least...

"Commodore C64 PLA 906114-01 redesign with M27C512-90B6 EPROM No more available"

btw, the upcoming micromys v5 adapter will do 1531-alike mouse for vic20

yeah right at startup (it doesnt quite start that is )

Are you sure? I've got my emulator working now. At the start of the game, it appears to set the following: oh! interesting :) i must have somehow missed that in the process... i had to add some of my own init stuff to make it not show crap at least :) your emu crashes on me though :( $ java -jar at...

I don't think the control registers themselves have intended default values on startup of the chip.

at least some of them must have defined default values - else this game would show random garbage

the game does very few actual accesses to the VIC, so its almost useless to tell the differences by looking at the game code... one thing that is obvious though is that the defaults differ :) meanwhile, i have it kinda working without a patched kernal.... the monkey patched screen copying stuff make...

making a custom emulator will be fairly straightforward if you already have a a vic20 emulator... the differences are small, besides the memory mapping (already discussed here) you'll have to mask the whole memory access by $3fff (so the hardware vectors are at $3ffx, not $fffx) and perhaps tweak th...

I'm not sure what you mean by this. Can you elaborate? yes: brainfart :) the game must be using 1c00-23ff for characters. with the actual letters and symbols in the 2000-23ff area, 1c00-1fff is used for the invader "sprites" etc i got slightly further with running it without a patched ker...

i hate you. i ran out of popcorn

yep, and 1c00-1fff is used for dynamic characters, 2000-23ff contains static characters. the hardware also seems to be wired up in a way that upper and lower half of the character set are swapped (compared to what we know from vic20)

so far what i have done is hooking into a routine that gets called once per frame, and then i just copy the screen (and color ram) to some location that is suitable for vic20 :) changing the addresses in the program is certainly possible too... but as said, a lot of work, since its not really obviou...

rotating everything would basically mean rewriting the game, i am certainly not attempting this :) actually, even making it work on actual vic20 without the terrible hacks i have been using (eg i modified kernal) seems difficult without putting a lot of effort into it but yes, controls work, it can ...