I think I've got all LS chips in the issue 5 board but I'll go check that in a sec... Is there a particular problem with HCT gates and floating pins? I'm only a software engineer, so I can usually follow the logic of the gates in a circuit but I don't know most of the rules for their electrical properties very well.
I'm also investigating a little weirdness with behaviour of cartridges in the expansion port when an Oojamaflip is connected, so once I've verifed the lower case board is working, I'll start looking into that next.
I have a CoCoSDC and DragonMMC which both work fine when connected directly to the cartridge port, so the port itself is okay but when I plug in a pull up adapter and oojamaflip (ready for a SuperSprite FM+ which isn't built yet), the DragonMMC continues to work fine, but the CoCoSDC starts misbehaving. I haven't connected both SD carts at the same time or anything daft, I'm just testing them one at a time, with nothing else in the second Oojamaflip port.
When the CoCoSDC is connected via the Oojamaflip, it seems to initially boot okay but then won't load anything from the SD card, and just gives a "BT error" when a load command is entered. Not sure what that means yet, and have to keep reminding myself it's probably not a Bluetooth or British Telecom error!
![Smile :)](./images/smilies/icon_e_smile.gif)
Anyhow, that's tomorrow problem, I'll go modify my motherboard and let you know how it goes with the lower case board.
Cheers again for your help, have a great evening!
![Smile :)](./images/smilies/icon_e_smile.gif)