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 Virtual 36 bit computer 
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Joined: Mon Oct 07, 2019 2:41 am
Posts: 922
The sun was shining, the birds where chirping., the grass... OK no birds or grass.
I decided since I had sun, to put the computer on the bench, and scope the signals.
A good bit of bounce on the clock A. power off. Lets check clock B.
Got every thing hooked up. and POOF a loud bang from the scope.
Time to order new test equipment. So the measuring will be delayed for a bit.


Wed Mar 25, 2026 11:23 pm

Joined: Wed Jan 09, 2013 6:54 pm
Posts: 1881
Oh no! A good old-fashioned scope with CRT and high voltages?


Thu Mar 26, 2026 7:44 am

Joined: Mon Oct 07, 2019 2:41 am
Posts: 922
BigEd wrote:
Oh no! A good old-fashioned scope with CRT and high voltages?

Yes, I have the Classic Boat anchor. Something went wrong in the sweep the section.
So for the price of a new VALVE, I have cheap digital scope on order.
I only want to test a few signals, so there is no need for fancy device at this time.


Thu Mar 26, 2026 5:45 pm

Joined: Mon Oct 07, 2019 2:41 am
Posts: 922
It works only under a **FULL MOON**. Could be heat related, cool here. Only when warmed up,does it work.
Address #15 gets set to 1 when at fault. Does not work at all with other ALU card. Need to order more parts for testing.
Got the new scope in, and any changes i make don't seem to change any thing. Crashes after a few minutes, but no memory
address error. Too dark to do anything today.


Sat Mar 28, 2026 10:52 pm

Joined: Mon Oct 07, 2019 2:41 am
Posts: 922
Built a new mother board with different bus pull ups. That seems to have fixed the problem.
Running my test program now.
APE's drink 67304 Bottles of beer,232696 Bottles on the wall
Waiting for parts for final tweaking.
Rather than rebuilding a better version of this computer. now that I have it working I plan to move to
a 10/20/40 bit cpu and go to a hex display. Only the data path needs to go from 18 to 20 bits. This will be my
spring project.


Wed Apr 01, 2026 12:53 am
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