With latest demoscene production there is sense using Amiga/Atari turbocards inside our Sega MD/Genny...
Here is Terrible Fire TF530 turbocard.It works on Amiga also on Atari ST too.It is opensource...
Even overclocking the 68000 is enough to break a lot of things.
Also you won't gain that much with speeding up the CPU aside from software rendering, because the VDP can't keep up with a much faster CPU (I think the limit is a 68000 at 10MHz, anything that can use the bus faster than it will break the VDP). We can easily replace RAM but we can't replace the VDP.
Probably the best you'll be able to get is a 68000 with different microcode like this one, which has faster multiplication and such but uses exactly the same bus cycles (it also means it's still horribly slow at memory access which tends to be the biggest blocker in software rendering): https://dcd.pl/ipcores/61/
You dont need compatibility for demoscene...Or 3d homebrew games...So special VDP in FPGA with more MHz?Maybe with hires modes and truecolor and simple 3d gpu...
Matej wrote: Wed Nov 01, 2017 6:49 pm
You dont need compatibility for demoscene...Or 3d homebrew games...So special VDP in FPGA with more MHz?Maybe with hires modes and truecolor and simple 3d gpu...
Put wait states on VDP accesses, and anything else that doesn't like to go fast. Have 1 or 2 MB of local ram at full speed for best performance.
I recall Jorge once bringing up that the VDP can happily take the 68000 running at MClk/2, but the surrounding components need to be changed to cope with it (and also faster RAM).
Would be interesting to see what a ～26MHz 68000 could do.
ColdFire lacks a lot of instructions though, and the ones that remain aren't even encoded the same way from what I gather =/ May as well throw in a 2GHz ARM CPU instead.
Sik wrote: Fri Jan 12, 2018 11:51 am
ColdFire lacks a lot of instructions though, and the ones that remain aren't even encoded the same way from what I gather =/ May as well throw in a 2GHz ARM CPU instead.
The CF68KLib allows most ColdFire processors to run 68k code; it supports 68000, 68020, 68030, 68EC040, 68EC060, CPU32, and CPU32+ instructions, though no FPU or MMU instructions. This would slow 68k code compared to native, but it would still blow a 680x0 of any variety out of the water. There have been ColdFire accelerators made for the Atari ST and Amiga that take advantage of this.
