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Desperado's latest activity
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Desperado replied to the thread Cbm 2001 Pet strange boot.A10/3 3,94V A10/4 5,1V A3/12 0,5V A3/13 5,1V A3/8 4,1V A3/9. 0,5V
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Desperado replied to the thread Cbm 2001 Pet strange boot.seems ok A3/13 OK A3/12 0,2 V ??? A3/9 0,2V ?? A3/8: strange signal...i can see double horizontal lines in the top:
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Desperado replied to the thread Cbm 2001 Pet strange boot.
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Those traces look fine to me. It is not too easy to view the videos however (from my perspective). If I freeze the video, I only get...
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Desperado replied to the thread Cbm 2001 Pet strange boot.https://www.youtube.com/watch?v=3Q9KxQXQoOg https://www.youtube.com/watch?v=i5Z0Hl5tbIw
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>>> I can see this on UB2 pin 6. I am glad you can. This is correct! If you look at the name of the signal on the schematic it is...
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Desperado replied to the thread Cbm 2001 Pet strange boot.I can see this on UB2 pin 6 :(
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>>> Maybe bad ls244??? Or maybe a bad CPU!!! Will you please stop just throwing random ICs out that you think could be faulty. This...
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Desperado replied to the thread Cbm 2001 Pet strange boot.I am desperate!!! This is the best setting to see a stable waveforms :((( This scope is a sh.. !!! Maybe bad ls244???
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Desperado replied to the thread Cbm 2001 Pet strange boot.Ok now i have CH2 (connected with BA15) in botton half screen and CH1 in the middle....correct?
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Lots of knobs to twiddle... DC coupled should work... these signals have a common ground. Select DUAL... use position to put CH1 in...
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You also need to select CHOP - otherwise the two traces will not be synchronised with each other. Dave
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Nivag, That will be too late. Desperado will have the PET fixed by then! :)
