Started by ComSoft6128, 17:48, 05 November 22
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Quote from: Prodatron on 19:56, 07 November 22It never was good to have a spectrum port on the CPC but maybe this time it would be cool
Quote from: sigh on 20:21, 22 November 22Quote from: Prodatron on 19:56, 07 November 22It never was good to have a spectrum port on the CPC but maybe this time it would be cool You wouldn't want a port of that. That CPU is getting CRUUUUNCHED!!! It would end up running super slow on the CPC, so you would need it done from scratch to get good speeds.
Quote from: Axelay on 14:39, 23 November 22Quote from: sigh on 20:21, 22 November 22Quote from: Prodatron on 19:56, 07 November 22It never was good to have a spectrum port on the CPC but maybe this time it would be cool You wouldn't want a port of that. That CPU is getting CRUUUUNCHED!!! It would end up running super slow on the CPC, so you would need it done from scratch to get good speeds.Why do you say that? The CPC wasn't 'automatically' half the speed of the spectrum when running spectrum code. It depends on what is being done, and how.With an arcade game from the commercial era, particularly one with software scrolling, the vast majority of the cpu time would usually be spent simply writing video memory with a minority on game logic. In cases like that, yes, the CPC having twice as much video memory to write using the same code was often very much slower.Without knowing any detail it's only possible to speculate, but in something where the bulk of the cpu time is perhaps spent on calculations or other logic, these are not the sort of things the CPC would have to do twice as much of compared to the spectrum, so any speed difference is unlikely to be nearly so pronounced. It just depends on how it goes about it.
Quote from: MaV on 22:02, 23 November 22No, you're right, Axelay. It won't be "super slow", nor would it run at half the speed, but still noticeably slower than the Spectrum version. Unless there's some Spectrum specific code (which I highly doubt), the 3D engine can be used as is on the CPC, and only the rendering part (drawing lines and deleting the 3D window) and the keyboard routines would need a redo.The one thing that might make up for a loss of speed would be the four possible MODE 1 colours plus added shading of these colours. You can imagine the black/white patterns in the Speccy Quake demo having more varied surfaces.Basically, what Driller, Darkside, etc. did on the CPC vis a vis the Spectrum monochrome versions, only a tad faster even than the Freescape engine, from what the Speccy demo shows.
Quote from: MaV on 01:34, 24 November 22If the CPC used bitplanes for colours (so two bit planes for four colours, similar to the EGA card, the Amiga and the Atari ST), using only one plane might have given us the same properties of a Spectrum monochrome screen. We would have had the speed of the Spectrum screen while also having the flexibility of additional two colours by plotting on the second bit plane, trading speed for colours on occasion.
Quote from: Axelay on 12:01, 24 November 22I can't but help but think had that been the case, there'd have been a lot more monochrome spectrum ports in the commercial era!
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