Reprogrammable 4 Megabit SMS cartridge circuit

For making dedicated cartridge versions of your homebrew games!

Description

This reprogrammable SMS cartridge circuit, perfect for easily making physical versions of your homebrew games! Can be installed in standard SMS cartridge shells.

Specifications:

Re-writeable 4Megabit (512 kB) flash chip
Compatible with PAL and NTSC systems
Compatible with the power base converter (or equivalents)
Sega-style mapper (slots 0, 1 and 2)^[1]
Fits in standard SMS cartridge shells
Tested and pre-programmed with the homebrew game DONKEY.SMS
(for demonstration purposes)

This design has no battery-backed RAM on-board, but with the right programming techniques, scores and progress can be saved directly on flash. The pre-programmed game, DONKEY.SMS, does that!

If you do not have an empty cartridge shell to fit this PCB, see also our reprogrammable cartridge.

^[1] We can develop a custom mapper if necessary for your game or project.
^[2] PFR Detect by Eric R. Quinn: https://www.smspower.org/Homebrew/PFRDetect-SMS

Ordering

Buy here

In stock : Ships within 5 business days unless noted otherwise (out of stock, pre-order, holidays, etc).

The raphnet online store is temporarily closed for 3 weeks, from May 27 (2026) to June 17. Orders placed before May 27 will be shipped normally.

If you would like to receive a notification when we re-open, please send an e-mail to shop+open@raphnet-tech.com. Consult the relevant FAQ entry for more information.

Item #

PCB-4MBIT-SMS

Description

Reprogrammable 4 Megabit SMS cartridge circuit

Price