The waveforms were after.
I think I'll go for a socket replacement tomorrow and update you with the results.
Colin.
Quote:
Originally Posted by SiriusHardware
Quote:
Originally Posted by ScottishColin
I note that the UD9 socket is now very easy to push/replace the EPROM into - I wonder whether the turned pin socket has damaged the original motherboard socket in any way?
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It does sound like a possible case of cause and effect, if that seems to be the case then the only thing you can really do is replace the socket.
You can try putting the original UD9 and / or the Slothie EPROM in its adaptor into UD9 socket and checking continuity from all UD9 pins to the associated UD9 PCB pads to see if you can identify which, if any of the connections, is not making.
Bear in mind that on the Slothie EPROM adaptor pin 18 of the upper socket is intentionally not connected to pin 18 of the lower socket and is instead connected to pin 20 of both the upper and lower sockets.
It's not clear whether the readings you go with the curiously low waveform height were taken before or after this problem arose? |