15 Jan
2004
15 Jan
'04
11:59 a.m.
On Thu, 2004-01-15 at 16:53, Brad Parker wrote:
Gordon JC Pearce wrote:
I really want to do it in discrete logic. Call me crazy, enough people
do as it is...
Actually, I'd probably do it in 40xx CMOS, simply because I don't want
to have a +5V supply the size of a MIG welder lying around.
There are PDP-8 emulators out there already, better ones than this too.
But I wanted one that was *mine*! (Shh, little secret, keep it under
your hat but it's an experiment, maybe a precursor to building an 8 in
TTL).
I'm probably high, but I'm still dreamy from the work the XKL guys did :-)
If you want to do it in an FPGA (well, CPLD), let me know - I'll help! You can get some simple cpld kits from Xilinx for $99.
I'd plop some
SRAM next to one and use a JTAG compliant port to load up the memory...
Might be another nice intermediate stage
(and, well, you'd obviously need a bunch of LEDS
also, otherwise, what
would be the point? :-)
What indeed... Now, Maplin do some nice 13mm LEDs, how big do you think
we could make a panel? How about the 3" LED clusters they use as tail
lights on buses round here? Make a PDP-8 6' across, like the giant
MS-20 that Korg made for demo tours in the 1970s?
Gordon.