On 3/13/2020 10:30 PM, Tapley, Mark B. via cctalk wrote:
On Mar 10, 2020, at 7:59 PM, John H. Reinhardt via cctalk
wrote:
[EXTERNAL EMAIL]
On 3/10/2020 1:17 PM, Tomasz Rola via cctalk wrote:
I really liked the idea of running VMS on simh (and learning some more
skills), even if I had to regi
I am helping a guy with a dead IBM 3279 terminal
The PSU does not seem to work. But as usual it is impossible to find any
schematic online for IBM stuff. Just interconnection diagram and high level
drawings.
Anyone?
Now the PSU circuit seems to be quite simple with just one IC in it. A chip
marke
On 3/14/20 3:21 AM, Mattis Lind via cctalk wrote:
Is there a cross reference list available for IBM numbers to standard chips?
there is a small list here
http://bitsavers.org/pdf/ibm/6580_Displaywriter/re/
it may have been expanded since the last time I searched for info on the web
for a cro
On 3/14/20 3:38 AM, Al Kossow via cctalk wrote:
On 3/14/20 3:21 AM, Mattis Lind via cctalk wrote:
Is there a cross reference list available for IBM numbers to standard chips?
there is a small list here
http://bitsavers.org/pdf/ibm/6580_Displaywriter/re/
it may have been expanded since the l
So, a while back someone had a broken MSV11-Q QBUS memory card, and needed
info on them. I said I'd provide same, but then got distracted. Well, I
finally got to it, and it's been added to the CHW page for them:
https://gunkies.org/wiki/MSV11-Q_QBUS_memory
It includes a table which says which c
Noel, you're incredible! Thanks for fuzzing this out, I've been working
on chiming clocks as of late and put this board on the back burner, but
with this swapping out the bad chip should be a piece of cake.
Thank you again!
CZ
On 3/14/2020 4:12 PM, Noel Chiappa via cctalk wrote:
So, a while b
Hello all,
This is probably a long-shot, but does anyone have any advice for testing the
End-of-Tape sensor on a QIC drive?
I've recently restored a Wangtek 5125ES (well, "restored" is a bit strong, I
just replaced the capstan roller) and after about 5 tape passes, it completely
lost its End-o
On 3/14/20 3:34 PM, Seth Morabito via cctalk wrote:
> Hello all,
>
> This is probably a long-shot, but does anyone have any advice for testing the
> End-of-Tape sensor on a QIC drive?
The only tricky thing would be having a mirror in the optical path. You should
see something happen on the p
On Sat, Mar 14, 2020, at 4:26 PM, Al Kossow via cctalk wrote:
>
> The only tricky thing would be having a mirror in the optical path. You
> should see something happen on the photo
> detectors (there are two) if you can get the light to make the 45
> degree turn
Further investigation with an
