Hi John,
As per Ewan's post above, if the Premium's 128K Coreboard has all 25 pins present on both the X1 & X5 pin strips, you should be able to swap between.
I know your other 128K Coreboard is adapted from a Starnet Coreboard but you have populate it to work as a normal 128k Coreboard with FDC,
so as such they should be sufficiently interchangeable for testing.
The earth strap will help a lot with stability & reliable operation however once again not normally critical from a testing / troubleshooting point.
You can just use a decent alligator clip / jumper lead just make sure it is well insulated (you don't want to short anything out).
Using the board lifters can be a bit hit and miss with the Premium and DRAM, (the ground lead definitely helps with that)so only use it when you really need to scope out the hard to get to signals.
PS. Ensure the battery has been removed from the Premium Main board if it has the Real Time Clock present, Very left adjacent the X1 25 pin connector.
If it is there look for damage to this area from leaking battery.
Ernest
As per Ewan's post above, if the Premium's 128K Coreboard has all 25 pins present on both the X1 & X5 pin strips, you should be able to swap between.
I know your other 128K Coreboard is adapted from a Starnet Coreboard but you have populate it to work as a normal 128k Coreboard with FDC,
so as such they should be sufficiently interchangeable for testing.
The earth strap will help a lot with stability & reliable operation however once again not normally critical from a testing / troubleshooting point.
You can just use a decent alligator clip / jumper lead just make sure it is well insulated (you don't want to short anything out).
Using the board lifters can be a bit hit and miss with the Premium and DRAM, (the ground lead definitely helps with that)so only use it when you really need to scope out the hard to get to signals.
PS. Ensure the battery has been removed from the Premium Main board if it has the Real Time Clock present, Very left adjacent the X1 25 pin connector.
If it is there look for damage to this area from leaking battery.
Ernest