6 Dec
1999
6 Dec
'99
1:21 p.m.
Hello,
I am looking for specifications of the old V.23 protocol, or general
informations about this.
Would someone know some hints ?
Thanks.
--
J.-P. Hofer
hofer(a)wgh.ch
__________________________________________________________________
Jean-Pierre Hofer Telephone : + 41 1 251 07 31
Ingenieur-conseil
Case postale 3126 E-mail : hofer(a)wgh.ch
CH - 8021 Zuerich
__________________________________________________________________
6 Dec
6 Dec
7:38 a.m.
New subject: DEC LA-180 and PDP8e/LC8-E
Hello, all,
I recently got my hands on a classic DEC LA-180 RO (receive
only) printer. It's a free-standing beast, with its own pedastal
that the electronics are in.
The electronics that make it work are all TTL, with a few
MOS ROMs for character generator, and two 2101 RAMs for
buffer storage.
There's a second board, that connects to the main electronics
board via a ribbon cable. This board has an old AY5-1013 UART
chip, and a bunch more TTL on it, and appears to be a serial
interface. The serial board appears to 'talk' to the rest of
the electronics via a basic 8-bit parallel port with strobe
and some status signals.
The serial card has a cable coming off of it that goes to a DB-25
connector that is affixed to the bottom panel of the pedastal.
I want to try to connect this up to my PDP8/e system as print device. I have
an M8329 LC8-E Decwriter Control board for the PDP8/e. The PDP8/e/f/m
External Bus Options Maintenance Manual
says that the LC8-E module is intended to connect up a DEC LA-30
decwriter. The LA-30 seems to be a printing terminal, with
a keyboard and printer. The LA-180 I have is a print-only
device, with no keyboard.
The LC8-E card has a Berg connector that is identical to the Berg
connector on the printer electronics board of the LA-180. I'm
wondering if the 'parallel' interface of the LA-180 is compatible
with the LC8-E card, and all I need to do is disconnect the
serial card from the main electronics in the LA-180, and
connect the printer up by stringing a ribbon cable between the
LA-180 and the LC8-E card. I don't have printsets for the
LC8-E card, so I don't know the pinout of the connector for the
printer, nor do I have any information at all on the LA-180 in
terms of the 'parallel' port interface of the printer.
Obviously, I'm not going to just plug it in and see what happens :-)
Anyone out there know if this will work? If so, is a special
cable needed, or will a 'straight through' cable work?
Any help would be very much appreciated.
Thanks,
Rick Bensene
The Old Calculators Web Museum
http://www.geocities.com/oldcalculators
8:11 a.m.
New subject: DEC LA-180 and PDP8e/LC8-E
I recently got my hands on a classic DEC LA-180 RO
(receive
only) printer. It's a free-standing beast, with its own pedastal
that the electronics are in.
[...]
I want to try to connect this up to my PDP8/e system
as print device. I have
an M8329 LC8-E Decwriter Control board for the PDP8/e. The PDP8/e/f/m
External Bus Options Maintenance Manual
says that the LC8-E module is intended to connect up a DEC LA-30
decwriter. The LA-30 seems to be a printing terminal, with
a keyboard and printer. The LA-180 I have is a print-only
device, with no keyboard.
You need a KL8-E or the like, not an LC8-E. The LC8-E is a parallel
interface, and the LA180 is a serial device.
10:29 a.m.
New subject: DEC LA-180 and PDP8e/LC8-E
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2:03 p.m.
----- Original Message -----
From: Jean-Pierre Hofer <hofer(a)wgh.ch>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Sent: Tuesday, 7 December 1999 4:51
Subject: V.23 protocol
Hello,
I am looking for specifications of the old V.23 protocol, or general
informations about this.
Would someone know some hints ?
Essentially it was a split baud rate used mostly by VIATEL and some bbs's.
It was 1200/75 duplex where the user had a 1200 link for downloading and a
75 link for uploading.
(Worked on the assumption - mostly true - that the user would be mostly
transferring data
/files to his machine from the host, and sending only control/command stuff
back.)
It worked ok for chatting too, since most people type a lot slower than
that.
If you need more, I can dig up specs, audio freqs etc.
FYI, 1200 bps amateur packet radio modems use the 1200 portion, in half
duplex mode,
often using the 7910 or 7911 World modem chips that were prevalent in such
things.
I have a packet modem that I still use today that was converted from an
ancient Sendata
modem for the C64. Works well.
Cheers
Geoff Roberts
Computer Systems Manager
Saint Mark's College
Port Pirie, South Australia.
Email: geoffrob(a)stmarks.pp.catholic.edu.au
netcafe(a)pirie.mtx.net.au
ICQ #: 1970476
6:04 p.m.
On Tue, 7 Dec 1999, Geoff Roberts wrote:
----- Original Message -----
From: Jean-Pierre Hofer <hofer(a)wgh.ch>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Sent: Tuesday, 7 December 1999 4:51
Subject: V.23 protocol
And adapted - in principle, at least - by US Robotics for their HST
protocol.
- don
Hello,
I am looking for specifications of the old V.23 protocol, or general
informations about this.
Would someone know some hints ?
Essentially it was a split baud rate used mostly by VIATEL and some bbs's.
It was 1200/75 duplex where the user had a 1200 link for downloading and a
75 link for uploading.
(Worked on the assumption - mostly true - that the user would be mostly
transferring data
/files to his machine from the host, and sending only control/command stuff
back.) It worked ok for chatting too, since most people type
a lot slower than
that.
If you need more, I can dig up specs, audio freqs etc.
FYI, 1200 bps amateur packet radio modems use the 1200 portion, in half
duplex mode,
often using the 7910 or 7911 World modem chips that were prevalent in such
things.
I have a packet modem that I still use today that was converted from an
ancient Sendata
modem for the C64. Works well.
Cheers
Geoff Roberts
Computer Systems Manager
Saint Mark's College
Port Pirie, South Australia.
Email: geoffrob(a)stmarks.pp.catholic.edu.au
netcafe(a)pirie.mtx.net.au
ICQ #: 1970476
8990
days inactive
8990
days old
5 comments
6 participants
participants (6)
-
ard＠p850ug1.demon.co.uk -
donm＠cts.com -
eric＠brouhaha.com -
geoffrob＠stmarks.pp.catholic.edu.au -
hofer＠wgh.ch -
rickb＠bensene.com