VCF West 2022 - Aug 6, 7 - Mountain View, CA
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MattisLind's latest activity
MattisLind
reacted to
Plasma's post
in the thread
Northern Europe
3.5 to 5.25 inch drive brackets with front.
with
Like
.
A few here. A bit pricey shipping to Sweden though.
Yesterday at 3:10 PM
MattisLind
replied to the thread
Rainbow 100 Graphic card
.
Hello! Really good work you have done with the mem expansion board and this board. Not really related to the Rainbow card itself but...
Yesterday at 9:02 AM
MattisLind
posted the thread
Northern Europe
3.5 to 5.25 inch drive brackets with front.
in
Vintage Computer Items Wanted
.
Looking for 3.5 to 5.25 inch drive bay brackets with black front that has a LED in it. Something like this: Anyone has something...
Yesterday at 7:33 AM
MattisLind
replied to the thread
DEC H7441 5V regulator repair
.
Nice to hear that it worked! Good luck with the rest of your restoration!
Yesterday at 5:11 AM
MattisLind
replied to the thread
Restoring a DEC PDP-11/05
.
The one I took a screenshot from above. The full schematics is here unless you already found it. The manual is also very good to read to...
Wednesday at 4:23 PM
MattisLind
replied to the thread
Restoring a DEC PDP-11/05
.
Thinking of it. The microprogram counter has to be in the backplane since it gets to the KM11 board. I just don't know what pins. It has...
Wednesday at 12:15 PM
MattisLind
replied to the thread
Restoring a DEC PDP-11/05
.
The KM11 has a toggle switch for this. There is lines on the bus DC LOW L. The signal is open collector so just add a driver that forces...
Wednesday at 5:07 AM
MattisLind
replied to the thread
Restoring a DEC PDP-11/05
.
I think that you either have to use a KM11 and single step it or use a logic analyzer so we can se any possible transitions until it...
Tuesday at 8:52 PM
MattisLind
replied to the thread
Restoring a DEC PDP-11/05
.
I would check the micrprogramcounter, MPC. It is in E101 and E111. The clock signal, the inputs and the outputs. Is there any activity...
Monday at 9:28 PM
MattisLind
replied to the thread
DEC H7441 5V regulator repair
.
1N4935 looks fine. It is a fast recovery diode. Should replace A114B just fine.
Monday at 5:02 AM
MattisLind
replied to the thread
VT100 keeps blowing main fuse
.
It is quite interesting to note how the fuse blows. When there is a short in the switch transistor or rectifier bridge the fuse blows in...
Aug 11, 2022
MattisLind
replied to the thread
DEC H7441 5V regulator repair
.
Yes. Indeed quite complex. I am just thinking out loud now: if the Q5 transistor is not driven into saturation it might get hot. Then...
Aug 11, 2022
MattisLind
replied to the thread
IBM RT PC experts?
.
I also installed the same zip package as you did. But NFS came from fsck.technology site. Unfortunately it refused to install. It...
Aug 10, 2022
MattisLind
replied to the thread
IBM RT PC experts?
.
Nice! Did you install all the updates? Did you manage to install NFS and the Distributed Function packages? Have you seen the files...
Aug 10, 2022
MattisLind
replied to the thread
DEC H7441 5V regulator repair
.
Difficult one. The lower voltage on Q4 emitter may indicate higher regulated voltage consumption. But there are variations on the zener...
Aug 10, 2022
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