16 Jun
2004
16 Jun
'04
2:55 p.m.
- Vince's
M452X and W076X PDP-8 replacement boards
I have some of those that I haven't been home to assemble yet. I'd wanted
to make a 300-baud-multiple crystal controlled clock for my PDP-8/L since
about 1984, but never got around to it... I'm happy Vince did the hard of layout and PCB manufacture.
Your'e welcome :-)!
I forget who, but someone has built a one-off DF-32
implementation in TTL
with
a Dallas battery-backed NVRAM (like a large version of
the NVRAM found in
SPARC
boxes). There seems to be an implementation bug, so
it doesn't work
perfectly
with original software, but you can write new stuff
from scratch that
works
well (there was some sense that was flipped between a
DF-32 and the RF-08,
it's
related to that, somehow).
That was done by Charles Morris, and I now own the prototype. I am working
(intermittently) on a related design for an RF08 replacement. (If someone
can help me with the indicator panel for the RF08 replacement, I'd
appreciate it.)
The implementation bug (in Rev A) was that the "skip on no error" was
implemented as "skip on error", RF08 style.
I also have stuff that may never see implementation (like my TC08 replica),
and an EAGLE library of DEC Gxxx and Mxxx modules (both as components for
projects like the TC08 replica and as individual boards you could have
produced).
Vince