A little lockdown relief.
Since the last photo, this SB II board has been packed away. Well, I say "packed away", but what I really mean is "stuffed into an antistatic bag and leaned against a bookcase in my study" as I have nowhere safe to store it. However, yesterday I took it out and connected it up again as you saw in the pictures. The purpose of this was to sort out a Gotek FDD emulator for it that I'd bought a while back and just dumped in the bag with the main board.
So, following Chris Cochrane's excellent guide on YouToobz : https://www.youtube.com/watch?v=-K31S2xqZIk
I reflashed the Gotek with FlashFloppy firmware. I found the ST Microelectronics download page for the Flash Loader Demo software was broken, even after registering for the download, so grabbed it from somewhere else. It took several attempts to reflash the Gotek - in the end I managed it at 9600 baud. Then I fitted a small OLED display and piezo buzzer and it worked first time.
I wanted to check the RTC on the main board but the boot image I have on the Gotek doesn't have the correct utility (TIME.COM). I have a SB II boot floppy here but as my SB II board doesn't have an actual drive I had to transfer it from the other Superbrain via Kermit. I'd normally do this by sending to my PC, swapping the serial cable over, then send to the SB II but thought I'd try it directly SB to SB II using a null modem cable. Happy to report that it, too, worked first time.
Finally, I have begun the next project, and that is incorporating uIDE drivers into the SB II BIOS. I've dumped all the memory to a text file (including the BIOS) and got it transferred to the PC. I'm now disassembling and commenting it. So far - and surprisingly - it is different to the Superbrain BIOS, so there will be a fair amount of work to do. I'll need to do the same to the boot / floppy ROM as well... but it's all good fun, right?