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PicoRAM Ultimate

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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PicoRAM Ultimate is the ultimate storage solution for single board computers (SBCs) / CPU trainers from the 70s and 80s.

It emulates:
- up to 4 2112 SRAM chips: it replaces the 512 bytes of stock SRAM in the Heathkit ET-3400; alternatively,
- a 2 KB memory expansion for the Heathkit ET-3400 (with expansion header installed),
- a single 6116 2 KB SRAM (e.g., for the Multitech Microprofessor MPF-1 / 1B / 1P),
- up to 4 2114 SRAM chips (e.g., for the Lab-Volt 6502 and Philips MasterLab MC6400 CPU trainers).

Using the built-in SD card interface, PicoRAM Ultimate allows you to save and load full memory dumps (including programs and data) to and from SD card, hence, rendering the cassette interfaces of these SBCs obsolete (if they even came with one; i.e., the ET-3400 required an extra memory expansion + IO box for the cassette interface, and the Lab-Volt 6502 doesn't come with one either).

Supported 

Supported machines (as of June 2025):

  • Multitech Microprofessor MPF-1, -1B, -1P (Z80) 
  • Heathkit ET-3400 (MC6800) 
  • Lab-Volt 6502 Trainer (6502) 
  • Philips MasterLab MC6400 (SC/MP III = INS8070) 
  • Busch Microtronic (well, kind of - this is really a bigger beast, see PicoRAM 2090)

2112 Emulation for the stock, unexpanded Heathkit ET-3400 (4x 2112 SRAMs = 512 bytes): 


Heathkit ET-3400 Memory Expansion Mode (2 KBs of 2112 memory; requires extra GAL 16V8 as an address decoder): 


6116 Emulation (Microprofessor MPF-1B with 2 KBs of 6116 SRAMs; also see PicoRAM 6116): 


2114 Emulation (Lab-Volt 6502 CPU Trainer with 2x 2114 SRAMs, 1 KB): 


Last supported machine - the Philips MasterLab MC6400 (2x 2114 SRAM, 1 KB), a SC/MP III (INS8070) trainer from ~1985:



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