In message <200602171208.k1HC8XZL027665 at mwave.heeltoe.com>
Brad Parker <brad at heeltoe.com> wrote:
Sorry, I was thinking coin-op game, not home computer.
Very different.
I don't have much experience with home computers.
I've always wanted to get an arcade game or two, but I doubt I could find
room for it. Asteroids is still my favourite (a bit before my time, but still
pretty addictive).
Most atari coin-op games have fairly obvious graphics
hardware, either
raster or vector, which is separate from the cpu... and an occasional
pokey or two for sound :-)
Ah, the Atari DVG. Good fun to reverse-engineer, even more fun to implement
on a CPLD. One of these days I'll see about building up a DVG-on-a-PCB and
maybe wire it up to my homebrew 6502 computer.
I ended up reverse-engineering the DVG from the state tables and schematics,
then wrote a little PDF that explained some of the more unusual parts of the
DVG.
I've got a Verilog model that works *in theory* but needs hardware testing.
99% of the trouble is designing a suitable PCB and a GAL to do the address
decoding...
If anyone wants to take a look at my DVG model, let me know and I'll tar it
up and stick it online somewhere.
Oh, and I've also got a nifty little homebrew CRT vector display based on a
DG7/32. I have absolutely no idea what its maximum bandwidth is - I really
need to build a dual-channel signal generator and do some tests...
Speaking of which, I need some Molex "KK" 0.1" PCB connectors (cable
headers
and PCB headers). Anyone know of a cheap source of them? I'm after ten pairs
of 3-way, two pairs of 6-way, two pairs of 2-way and a pair of 12-way.
Thanks.
--
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