So far, the BBTC doesn't work. I removed all the chips on sockets. Only chip remaining on board is the RAM and CPLD.

At this point, the BBTC's CPLD is programmed.

When I plug the BBTC with the Nano 8088, the Nano 8088 doesn't boot. No video, no message, nothing at all. It boots normally if I remove the BBTC.

I soldered an unprogrammed CPLD on an empty BBTC and I have the same result. When I put an empty BBTC, the Nano 8088 boots normally.