Desperado
Veteran Member
- Joined
- Nov 25, 2017
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ROM E link set to ON, correct?Can you change Nivag's board and set the ROM E link IN (to enable Nivag's PETTESTER code).
ROM E link set to ON, correct?Can you change Nivag's board and set the ROM E link IN (to enable Nivag's PETTESTER code).
Ok,
Can you change Nivag's board and set the ROM E link ON (to enable Nivag's PETTESTER code).
Then swap the ROM in socket UD7 for your PETTESTER EPROM.
Give it a run...
What we are going to do is to checksum the PETTESTER ROM in socket 'd'.
The PETTESTER code will think that there is a 4K ROM in UD7, so it will attempt to check it twice. I will have to compensate for that if I can.
Can you ensure the 'd' checksum that is displayed is stable. If it isn't, we can't use this test.
Dave
yes was stable!You didn't state whether the checksum was stable again...
I have this View attachment IMG_20230326_143945.jpgOk.
So with the new test I asked for?
Dave
but now UD7 socket is empy...you told me to leave empty this socket...or not?Can you remove the PETTESTER EPROM from socket UD7 and put the original PET BASIC ROM back in UD7.
Ud8 is edit rom socket...Why was PETTEST in UD8 ?
Yes Gary this is a 2001N perOooh, is this a 2001N ?
Thought we were diagnosing a CRT pet
Ignore everything I say
Must have got confused with another !Yes Gary this is a 2001N per
For this??That UD8 EDIT ROM socket us knackered!
Can you see why?
Compare it with a new IC socket of the equivalent type...
Dave
Ok thanks so much! So now how can i do? Time to change ud8 socket again?Yep; and I may be able to see a few other pins (although perhaps less clearly) where there appears to be a gap between the contacts that grip the pin of the IC.
If this is the case, this socket is toast I am afraid. I can also see significant damage to the plastic of the socket around pin 1. I suspect this to be because you are using a screwdriver (perhaps) to remove the ROMs? With the constant insertion and removal of devices from UD8 you will damage the socket. This does, of course, also apply to other IC sockets as well. You should either purchase a 'proper' IC removal tool - or use Nivag's board now you have purchased one!
You might want to check other IC sockets fir similar contact damage now you know what you are looking for...
Dave