15 Dec
1999
15 Dec
'99
3:31 p.m.
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
I have intentionally not run the TTY for more than a few lines just for this
reason.
The PDP-8/L restoration continues. I have two devices to attach to my -8/L
for testing - a VT220 (all have 20mA current-loop connectors) and an
ASR-33.
OK, first thing to do is to clean and oil (correctly!) that ASR33. If
parts are sticking, there's a reason for it, either no oil or old,
gummed-up oil. Carrying on running it like this will cause wear and/or
damage. Do you have the 3 grey books for the ASR33? Volume 1
of the maintenance
manual covers lubrication.
If I do, it's long buried. What's the synopsis for the area around the print
hammer/type cylinder? Some letters print OK, some don't. The ones that don't
do OK for the first one, but as I said, I have to manually press the cylinder
back down to its locking position.
How many types/grades of lubricants are there for a proper lube job on a TTY?
Reader run is another loop (and it's not part of
the 'standard' loop
setup).
Right. I located the conversion manual in the back of some 11/20 docs - how
to turn a factory-fresh TTY into a DEC-modified ASR-33.
According to a PDP8/e printset, the pinout of the
8-pin mate-n-lock...
I seem to remember that's 'standard' on DEC devices. You may well need
the equiavlent of a null-modem cable to link a VT220 to the card (swap
(2,3) and (5,7)).
That's the kind of thing I was looking for.
A word of warning. THere are several versions of the
COM8116. The
'standard' one, as used by Radio Shack in the TRS-80 uses a 5.0688MHz
clock.
I have the standard one. We used it in an optional modem eliminator option
for our sync serial boards. I have the xtals, too.
Thanks for all the good info, Tony. Now if I could only locate the box of
20mA cables in the attic...
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
Do You Yahoo!?
Thousands of Stores. Millions of Products. All in one place.
Yahoo! Shopping: http://shopping.yahoo.com