Michael Wessel... both ET-3400A and ET-3400 ROM emulation are fully functional. Given that PicoRAM adds 2 KBs of emulated RAM / ROM, and the ROM starts at 0xFC00 and is 1 KB only, there was still some space to add my Towers of Hanoi program starting at 0xF800. PicoRAM's GAL was changed to map into the upper 2 KB = 0xF800 to 0xFFFF address range.
ET-3400 ROM Emulation working
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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