MSX Cartridge Shop MegaFlashROM
This page was last modified 02:22, 3 July 2022 by Gdx. Based on work by Mars2000you and Rderooy and others.



This MegaFlashRom is a cartridge developed and made by Manuel Pazos. It allows us to store the images of any ROM cartridge with same mapper or similar. The loader also can launch many megaroms with a different mapper and even ROM using internal patches.

The contacts of these cartridges are mainly gold plated (some MegaFlashROM SCC+ batches are hard gold and others flash gold) and sometimes tinned.


There have been several generations of MegaFlashROM cartridges:

Generation 1

Four different cartridges were available:

  • Basic model or MegaFlashROM 512: 512kB FlashROM and ASCII8/ASCII16 mappers
  • SRAM model or MegaFlashROM SRAM: 512kB FlashROM, 2 or 8Kb SRAM and ASCII8/ASCII16 mappers - The SRAM is used for saved states and It is also possible to store the SRAM contents to disk and vice versa.
  • SCC model or MegaFlashROM SCC: 512kB FlashROM, SCC chip and Konami SCC mapper - so you can enjoy the classic Konami SCC games in full, or use the MegaFlashROM with SCC productions from the MSX scene. It has a button to disable the flashed ROM, to flash a different one. When used on a main (non-extended) slot, it allows to use up to 4 ROMs simultaneously simulating sub-slots.
  • Extended model or MegaFlashROM 1024 (experimental): 1024kB FlashROM and ASCII8/ASCII16 mappers - Uses the main Flash memory as SRAM and is also conceived for game compilations including a game selector.

There were also a few units produced of the SCC model with 1024kB FlashROM (2 banks of 512kB).

Generation 1.5

  • The previously mentioned model MegaFlashROM SCC, but using a custom PCB and brand new SCC chips and DACs.

Generation 2

  • The previously mentioned model MegaFlashROM 1024, but with only the ASCII8 mapper - this model is more known as MegaFlashROM to differentiate it from the SCC and SCC+ models.

Generation 3

  • MegaFlashROM SCC+. This model has 1024kB size and contains a FPGA that implements a secondary PSG and a SCC chip and support for several mappers. When used on a main (non-extended) slot, it allows to use up to 4 ROMs simultaneously simulating sub-slots.

Generation 4

All the previous models have been replaced by the MegaFlashROM SCC+ SD, a combo cartridge with a SD card reader.

Minimum System Requirements

  • MSX computer with 64KB, one free slot cartridge (a primary slot) and a disk for rewriting the cartridge


first official MegaFlashROM cartridge
MegaFlashROM PCB
MegaFlashROM SCC+ cartridge
MegaFlashROM SCC+ PCB front
MegaFlashROM SCC+ PCB back
MegaFlashROM SCC+ packaging