Initially ran card with 8 MHz crystal can oscillator. 10 MHz oscillators were not in stock at Mouser.

Ordered 10 MHz can oscillator and tested card. Worked good.

Timing Analysis via Measurement and Datasheet

Timing measurements with 8 MHz crystal oscillator showed very wide clock pulses on DS*, etc. Modern SRAM is 55 nS and modern Flash is 70 nS so the only wait states on the card can come from the DUART and it provides its own DTACK*.