15 Jun
2015
15 Jun
'15
1:48 p.m.
On Jun 15, 2015, at 11:54 , tony duell <ard at
p850ug1.demon.co.uk> wrote:
Ah, 'there's not the time to do it properly, but there is the time to do it
again'.
Why not do it properly first time? What is the rush in bringing up a classic computer?
Sorry for yet another reply, but I didn't think of this until just now: When I was
working on getting tu58em functioning with my 730's console code a couple weeks ago, a
few folks recommended that I build an Arduino-based emulator that has been known to work
well. But I didn't, because I didn't have that particular kind of Arduino board on
hand, and I wanted to get it working that weekend instead of the next one. And I did. :P
'Full stock of TTL parts' ??? You make it
sound like I am suggesting using lookahead carry generators,
parallel multipliers, Excess 3 to 1-of-n decoders and the like (all of which exist(ed) in
TTL). No, I am suggesting
using some very common counter and gate ICs.
How are you going to fix a TTL-based machine like your 11/730 without spares and without
knowing
what the ICs do?
The same way I got my HMMWV running back in 2000. I had quite a bit of parts and tools on
hand already from my previous work on my M543A2, and plenty of manuals to study. Some
things I fixed with what I already had on hand. And when I found that the injection pump
needed rebuilding, I took out the pump and brought it to a local Stanadyne shop. And I
ordered a replacement radius rod end after I determined I needed it, not before. I had a
lot of 1/4"-20 grade 8 hardware in my junk box already for misc. mechanical repairs,
but I still had to order some more for sizes I hadn't encountered before.
Back on the 730, I don't have most of the parts you mentioned on hand already because
I've only gotten into retrocomputing within the last 2 years, and I've spend most
of the last 30 years keeping with the times. Hint: I haven't designed a through-hole
board at work since the early 1990s, and I didn't use perfboard the last time I built
a GPS receiver the size of my pinky fingernail (not an exaggeration). ;)
--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/