13 Aug
2004
13 Aug
'04
9:27 a.m.
From: "Dave Dunfield"
<dave04a(a)dunfield.com>
---snip---
Any further ideas?
Hi Dave
It still sounds like a RAM related issue. The 6502's
needed to gate the VMA with Phase2 ( as I recall ) to
get clean address selects. You might put a scope on
this circuit and make sure it looks like it is working
well.
You should try to create a more exhaustive RAM test.
Although, time consuming, GALPAT is just about the
most intensive.
Dwight
Regards,
Dave
--
dave04a (at) Dave Dunfield
dunfield (dot) Firmware development services & tools: www.dunfield.com
com Vintage computing equipment collector.
http://www.parse.com/~ddunfield/museum/index.html
13 Aug
13 Aug
10 a.m.
New subject: ASR-33....its alive (sort of)
To those who have been following my restoral of an ASR-33 [the h-plate
horror], it is finally working in reasonable order <doing the happy dance>
The main items are:
1) need a new rubber for the sriker before I destroy the head (and
sources...a "like new" head would also be great..
2) Ribbon(s)
3) Some key "sticky". Not too bad, about the condition of the machines I
worked on in the 70's
4) Likage for "HereIs" not there (the little white plastic paddle).
5) Getting "On-Line" working...Need either 20mA loopback and/or 20mA/RS-232
converter
It is always progress.....
Also I am going a rescue of some items tomorrow. Most of the lot is spoken
for, but any extra items will be posted on the list for sale...items which
do not move there will be transferred to ePAy after a reasonable period (as
defined by me) to help recover the cost of the rescue.
David.
9:59 a.m.
New subject: ASR-33....its alive (sort of)
On Fri, 13 Aug 2004, David V. Corbin wrote:
To those who have been following my restoral of an
ASR-33 [the h-plate
horror], it is finally working in reasonable order <doing the happy dance>
The main items are:
1) need a new rubber for the sriker before I destroy the head (and
sources...a "like new" head would also be great..
While the actual Teletype-issue striker might be problematic to find,
many of us (and others on the Greenkeys list) have had good luck using one
of those small rubber feet with the adhesive on the back (one commercial
brand is 'BumpOn').... just clean the hammer pad and stick on one of the
3/8" round or square feet - problem solved. I've done this myself and the
rig is, to the best of my knowledge, still in service five years later.
Cheers
John
14 Aug
14 Aug
9:12 a.m.
New subject: ASR-33....its alive (sort of)
On Fri, 2004-08-13 at 12:00, David V. Corbin wrote:
To those who have been following my restoral of an
ASR-33
1) need a new rubber for the sriker before I destroy
the head (and
sources...a "like new" head would also be great..
John's idea. Even the Greenkeys crowd mostly approves of it :-)
2) Ribbon(s)
www.westnc.com and other sources.
7264
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