12 Jul
2010
12 Jul
'10
5:41 p.m.
Chris M wrote:
Plenty often enough, but my TODO list is *extremely* long, and nearly
everything else is more urgent.
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.
please share. It's not nice when you don't
share.
The schematic has been online for ten years:
http://www.brouhaha.com/~eric/retrocomputing/apple/apple2/68020/
If anyone were to actually build one, I could probably dig up the PAL
equations.
so I
occasionally get tempted to build S/N 2.
not often enough apparently 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? Now this thing was some sort of coprocessor thing I
guess, right?
Yes.
Could you be more specific. Details details.
There aren't really any more details to be had. Sorry. It was just a
one-off hack.
Eric