PDP-8/L teletype interface

[Sebastian Brückner]

vrs schrieb:
>>I know how to operate an oscilloscope and I have some experience with
>>electronics but I'm not very good at reading logic and I only ever spent
>>a couple days with this computer so I need some help here. Is there
>>anything I have to look for especially?
> 
> IIRC, the clocks are fast pulses, with nothing like a 50% duty cycle.

I see. I will look again. The baud rate clock coming from the M452 has a 
50% duty cycle so I looked for more (much faster) similar signals. Bad idea.

I got a much bigger problem now though: When I tried the programs again 
I realized that running progams doen't work any more at all!
I can single step fine but whenever I press "run" the front panel locks 
up and nothing more happens.

Sebastian