I've started playing with a different design, initially intended just for my NE2000 emulated wifi card, but I am able to do the soundcard stuff on it as well, and it so far a dramatically simplified design (electrically), which is one of the reasons this project has been slow to move, not because it was not working, but bringing it to a state that was economical to manufacture was not easy and factor in general chip shortages of what normally would be easy parts.... became very discouraging and depressing.
an almost entirely pico w based design brings some hope. An even simpler design would be just using an RP2040 chip (although hard to hand solder) would make it even simpler, but given my actual motivation for pcmcia cards is communication related stuff, using a pico w is attractive. I tried to go down this road with the ESP, but interrupt latency was a problem, power consumption was not great, limited i/o required a lot of external components. Pico Solves much of that.
https://twitter.com/yyzkevin/status/157230786 … qHZIAaIdXDLqGGA