18 Jun
2019
18 Jun
'19
8:43 p.m.
came across these this eve, probably only of interest to Seth, since he has one
http://bitsavers.org/pdf/att/5620/schematic
18 Jun
18 Jun
10:47 p.m.
On Wed, Jun 19, 2019 at 1:00 AM Al Kossow via cctalk
<cctalk at classiccmp.org> wrote:
came across these this eve, probably only of interest
to Seth, since he has one
http://bitsavers.org/pdf/att/5620/schematic
I have one too (from a friend who used to work in the Columbus Bell
Labs Operating System Group (cbosg)). I found the read-through to be
quite illuminating, especially the detail on the keyboard circuit
(4800 bps TTL levels off one channel of the DUART). I do have a
keyboard but this info makes it simple to contemplate a keyboard
adapter for those that do not.
Thanks for posting this, Al.
-ethan
11:31 p.m.
On Tue, Jun 18, 2019 at 11:18 PM Jason T via cctalk <cctalk at classiccmp.org>
wrote:
On Wed, Jun 19, 2019 at 12:48 AM Ethan Dicks via
cctalk
<cctalk at classiccmp.org> wrote:
Just a general bit of advice (which applies to many other systems discussed
here) for you 5620 owners -- the 5620 has a battery in it, soldered to the
logic board. If you haven't already, remove it before it leaks and
destroys everything.
- Josh
Thanks for posting this, Al.
Seconded. I've got one with the keyboard and ladybug mouse. Worked
many years ago - and I'll never know if it has stopped working if I
don't plug it in again!
19 Jun
19 Jun
11:27 a.m.
On Tue, Jun 18, 2019 at 9:43 PM Al Kossow via cctalk <cctalk at classiccmp.org>
wrote:
came across these this eve, probably only of interest
to Seth, since he
has one
http://bitsavers.org/pdf/att/5620/schematic
There's also a set here:
http://www.brouhaha.com/~eric/retrocomputing/att/5620/
I have not compared them.
1795
days inactive
1795
days old
4 comments
5 participants
participants (5)
-
aek＠bitsavers.org -
derschjo＠gmail.com -
ethan.dicks＠gmail.com -
silent700＠gmail.com -
spacewar＠gmail.com