Michael Wessel... got my hands on a Heathkit ET-3400A. This one has the much faster 6808 CPU. It took me a week to get the timing right, but eventually, I got there:
PicoRAM and the 6808-Based ET-3400A
A project log for PicoRAM Ultimate Rev. 2
SRAM Emulator and SD Card Interface for Vintage Single Board Computers (such as the Heathkit ET-3400, Lab-Volt 6502, and Microprofessor)
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