68K ISA project
eric at brouhaha.com
Mon Jul 12 19:41:53 CDT 2010
Chris M wrote:
> please share. It's not nice when you don't share.
The schematic has been online for ten years:
If anyone were to actually build one, I could probably dig up the PAL
>> so I occasionally get tempted to build S/N 2.
> not often enough apparently
Plenty often enough, but my TODO list is *extremely* long, and nearly
everything else is more urgent.
>> Originally I wanted to design an upgraded version that could
>> DMA into the Apple memory, for higher performance graphics.
> DMA oftentimes is simply a chip. So witch chip you wuz gonna use?
There isn't any off-the-shelf chip that can adapt a 68K to act as a bus
master on an Apple II in any sensible manner. I would have had to
design my own logic for that.
> Now this thing was some sort of coprocessor thing I guess, right?
> Could you be more specific. Details details.
There aren't really any more details to be had. Sorry. It was just a
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