Stuart

Would be great if you could, if you're happy to do so. Perhaps with an emphasis on being able to diagnose/repair the broken units out there, as opposed to plans to build new ones. We know there are at least three PCB layouts, one with the EEPROM and RAM as thru-hole (DIP) components, and two layouts with the EEPROM and RAM as surface mount. Would be useful to know if he swapped pins around on the CPLD between the designs, or if they all use the same CPLD pinout.

Smashing stuff! Did you explore the possibility of getting the schematics for the various versions, or the code for the Xilinx CPLD?

Ahh, printing photos of a certain environmental activist, were we ...?

The +5V regulator is powered from the +12V supply, but the main +5V supply current path (through the TIP31 transistor) is not from the 12V supply.

As am I but no guarantees. Send me a PM if you want to exchange details.

Breadboard is OK as long as you're careful and methodical.

I suspect probably not - it has to be present, but not necessarily formatted. Otherwise you're in a chicken and egg situation ... if it is unformatted and therefore not recognised, you can't call CALL FORMAT to format the first volume.

If you find that the disk DSR is active even if a CF card is not detected, then @stevelanc might want to try the Extended BASIC program here: http://www.stuartconner.me.uk/ti/ti.htm#checking_disk_controller_card_dsr to see if any of the DSR at all at >1100 can be read.

So if you run that with the NanoPEB, does it list two DSRs - >1100 for the disk and >1300 for the RS-232?

@stevelanc Have you got a MiniMemory cartridge? As the NanoPEB RAM seems to be working, might be worth trying to read the DSR in case it's just the DSR EEPROM that has gone bad. That is replaceable if someone is able to make a copy of theirs.

Looks like the bodge wire is just a GND to GND connection, and is original. OLD CS1 has got two different versions of the NanoPEB PCB by the looks of things, while I have an older one with two bodge wires.

So where does the other end go? It's a GND connection on the side port, as far as I can tell. Any obvious differences in the PCB tracks in that area, in the case of it was a 'bodge' wire that was fixed in a later batch of PCBs?

Can't remember if all the NanoPEB variants 'announce' themselves on the title screen. Have you tried going into BASIC and doing something like a CALL MOUNT(1,1) to see if anything happens? Also check that the NanoPEB is correctly aligned on the console edge connector - sometimes the NanoPEB connector had a bit too much play and might not align correctly. There are a few more tests you can do to see if the console can read the NanoPEB DSR but that may not be of any help if it is otherwise not working. Probably difficult to get it repaired, as Ricky says above. You won't regret getting a TIPI.

Usually called a trimmer capacitor. Often has 3 pins for mechanical stability - 2 of the pins are connected together.

Have you checked the Video > Filter Mode is set to None?