PicoRAM playing PicoROM

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)

Michael Wessel • 01/21/2026 at 02:34•3 Comments

ROM emulation is running stable now - I disabled the Write Enable (/WE) signal detection in the firmware software, resulting in a stable ROM emulation:

I will change the firmware such that it distinguishes between ".RAM" and ".ROM" files on SD card - ROM files will get the "automatic memory protection", RAM files obviously won't. New firmware version 1.8 soon - stay tuned!

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PicoRAM as PicoROM

01/20/2026 at 02:31 • 0 comments

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ET-3400 ROM Emulation working

01/21/2026 at 16:09 • 0 comments

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Michael Wessel wrote 01/22/2026 at 05:04

Maybe it could be PicoROAM (or PicoRAOM) :-)

Are you sure? yes | no

Michael Wessel wrote 01/22/2026 at 05:04

Thanks Ken - appreciate it! Yepp, it had to be :-)

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Ken Yap wrote 01/21/2026 at 05:50

I don't suppose there's much call for PicoWOM. 🤪 But seriously, cool project. 👍 It was only a matter of time for MCUs to get fast enough to emulate RAM and ROM.

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PicoRAM playing PicoROM

PicoRAM as PicoROM

ET-3400 ROM Emulation working

Discussions

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