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Mouser Joystick Patch

by gdx on 22-04-2018, 09:03

Joysticks was supported in game but not in selection menu. It is especially inconvenient when using a wireless controller. That's why I made these patches that that allows to start a game with joystick.

Usage is as shown below.

Press button 1 of joystick 1 to one player game.
Press button 1 of joystick 2 to two players game.

An updated version of MSX-DOS2.SYS by NYYRIKKI.
See this newspost for the details.

When the patch is applied, [Select] Key allows you to display the menu in game.
If you hit [Select] key twice time it switches the character directly.

You can also use a JoySNES or Mega-2-MSX adapter instead of an FM-Town

Patch 2 Players for Yie Ar Kung-Fu

by gdx on 31-03-2019, 16:48

IPS patch released by Adriano for Konami's Yie Ar Kung-Fu. After patching the game, you will get a neat 2 player mode, which greatly enhances the amount of fun you can have with this MSX1 classic.

Patch for Beer IDE interface to bypass the slot 2 during start up (by pressing the 0 key) and the FS-A1 firmware.

Tested with the following Roms:


update 20220812; item removed on request of the uploader.


Please, can you remove this download below? This doesn't work as well as I expected on real MSXs and I have no hope of fixing this soon. It even doesn't work at all on some MSXs.


Patch to fix graphics corruption on MSX1.

Patch Rom size for Dig Dug

by gdx on 09-09-2017, 11:03

Dig Dug (Namco) is a false Rom of 32kB. This patch allows to make a Rom in real size (16kB).

Patch to fix the MB-H2 firmware

by gdx on 24-12-2021, 08:55

The original firmware searches if a ROM cartridge is inserted in the slot 1 or 2, if no ROM cartridge is found, the firmware is executed. Which is practical but the secondary slots are not taken into account, so if you insert a disk interface with several functions (memory expansion, megaflash-ROM, etc.), it will not be detected and the firmware will start, which causes a conflict.

This patch was made for the MSX2 Philips NMS-2220.

After applying the patch and replaced the ROM (Application ROM), use the
Basic instruction _DESIGNER or CALL DESIGNER to run it.

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