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CMB PET 3032 ( 2001N BOARD )

CPU PIN 7= sync ok!
UD8/UD9=20 waveform signal but i can t see pulses... This is picture of ud8 pin 20
 

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What is wrong with UD8 pin 20? It is a low going pulse! I see pulses...

Is UD9 pin 20 doing the same? There will (however) be much more activity on this pin than UD8 pin 20.

Dave
 
Set the ROMulator RAM link to OFF/OUT and see what the first two characters on the top left of the screen are.

Double check that you have the same measurements again to demonstrate the code is actually working...

Depending upon what we observe, we can then probe the RAM signals with the oscilloscope.

Dave
 
daver2 said:
Set the ROMulator RAM link to OFF/OUT and see what the first two characters on the top left of the screen are.

Double check that you have the same measurements again to demonstrate the code is actually working...

Depending upon what we observe, we can then probe the RAM signals with the oscilloscope.

Dave
Click to expand...
Yes, same chars and same signals!
 
Desperado said:
Yes, same chars and same signals!
Click to expand...
Now that really is interesting...

Set your oscilloscope up for two channel operation and CHOP mode. Set the trigger for channel 2.

Connect channel 2 up to UD8 pin 20 and get the oscilloscope trace to give a stable display. Adjust the timebase so that you can see two (2) pulses of UD8 pin 20 on the screen - one at the left and the other at the right of the screen if possible.

We will then use channel 1 as a probe, synchronised in time with channel 2.

Dave
 
Ok go back again then. We need a minimum of 2 pulses for this to work...

Get a piece of paper and a pen, align the paper horizontally in front of the oscilloscope screen and mark on the paper where the 3 pulses occur.

Dave
 
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