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Posted By

Litwr
on 2014-03-17
13:24:03

Re: C+4 sprites

Thank you very much. VIC-2 is the real great chip for 1982. I can imagine 8 sprites combined to one moving image - it is with 8 free colors added to the background bitmap - shocking! 16K pixel video memory is slower to update. It may be easy noted at CPC, which processor is slightly faster than +4 but overall performance of CPC is slightly slower due to the slower video system. However CPC6128 at 160x200 mode may emulate any C64 sprite effects. It is odd that Commodore so easy gave the cheap text processors market to Amstrad. IMHO it had to be Script+ instead of 3+1 ...

Posted By

MMS
on 2014-03-16
16:24:46

Re: C+4 sprites

Not in full color.
On Plussy the two fix colors over the whole screen (Background color (0) and 3rd color) limits the remaining free color possibilities. They are very good for sprite emulation, if it is eg. a mouse cursor with two colors, if those colors are the background and the 3rd color

As the Plussy color map allows only 2 free colors per 8x8, not to mention, that C64 spites may use other extra colors to the 3 free colors per 8x8, it is almost impossible to 100% simulate the C64 sprites if the C64 capabilities fully utilized. But it is multi mode, in HIRES mode the C64 and Plussy are 100% equal, except the more colors of Plussy.

If Plussy would have been a double color and brightness map (may use the useless (hidden) lower 2K memory in basic in 64K mode), that would have allow 4 free color per 8x8 cell, then it would be a different story, but then C16 and C116 could not exist at all, as 16K memory would be enough for nothing.

In that case no FLI tricks would be needed at all, the color possibilities of Plus/4 could be fully utilized, and/or FLI mode could be much-much more colorful too.

Maybe once GAIA should create such a new GFX mode in his next Emulator (double color map, 4 free colors per 8x8 cell), just to check how it may work

Well the guys made for the "C64 in Joystick" gizmo a 256 color chunky mode too

Posted By

Litwr
on 2014-03-16
15:17:47

C+4 sprites

I have an old question to ask. Is it possible to emulate C64 sprites via some kind of *heavy* magic? IMHO C64 gives 3rd free color to 8x8 hires matrix, so it is impossible for C+4. Am I right?