OCM Zemmix NEO

OCM-PLD Pack v3.3 released for One Chip MSX and Zemmix NEO

After 2,5 years of hard work, KdL has released a new PLD Pack for the One Chip MSX and Zemmix NEO.

Release Notes:

v3.3 [2017.03.12] [KdL’s Updates!]

– Updated documentation and DIP-SW User Manual in the [docs\] folder.
– Updated the [msxtools\] folder: use ‘’ to add more drive letters and ‘’ to mount the disk images.
– New Hex-files 304kB from OCM-SDBIOS Pack v1.9 with MSX3 Final Release and Zemmix Neo logos.
– New IPL-ROM Revision 1.05(K) that it loads fast a 304kB BIOS / 384kB SDBIOS.
– New SDHC support by yuukun-OKEI, thanks to MAX.
– New useful scripts for easy compilation and collection of firmwares.
– Added Brazilian keyboard layout by Fabio Belavenuto, Luis Luca and Emiliano Vaz Fraga.
– Fixed R#0 S5 timing of VDP TH9958 by yuukun: the intro of Dragon Quest 2 MSX2 is ok now, thanks to miyashu.
– Fixed RstEna signal with regression and other minor fixes (RC2_2014.11.20).
– Fixed MainRAM/MegaRAM clear function (RC1_2014.11.16).

– The Nextor kernel will be natively supported by future releases.
– As regards the speed of cpu I inform you that ‘custom 8.06 MHz’ is the same 10.74 MHz of the original firmware.
All the ‘custom speed’ frequencies were acquired with a comparison benchmark through blueMSX and openMSX.
– The initial VDP-V9938 core is finally deprecated since the VDP-TH9958 has achieved the same stability.

Some known issues:
– VGMPLAY was fixed by Grauw for a inaccuracy of H-SYNC signal.
– The timings of VDP TH9958 are too fast: the intros of Fray and Space Manbow confirm the issue.
Hint! The most of Microcabin games can run better with the ‘’ tool.
– The ‘Break’ command of ESE-PS2 module do not work during the hard reset or if you unplug the keyboard at warm.
– Sometimes the SD-Card is not detected after a hard reset but you can re-insert it on the fly to solve.


Download :

KdL’s website


MegaFlashROM SCC+ SD on a One Chip MSX


Yesterday my MegaFlashROM SCC+ SD arrived and finaly I had some time to play with it.

Cause my ‘old’ MSX’s are at my ‘old’ house, I had only the option to put it in my One Chip MSX.

Here is a short video showing my first run, with one 4Gb SDHC card in the MegaFlashRom.
Everything seems to work and after booting and partitioning, my OCM SD card is still readable from Nextor 😀


Altera + Expansion Board

I was wondering how the concept would look like in combination wtih the Altera Board.
Lucky for me Paint.NET and the 3D model are a good combination 😀




Proof of Concept Altera DE1 Expansion Board (update)

Last week I was thinking about a schematic that I’ve seen on Caro’s website for connecting Joystickports, a keyboard port, Audio out, CAS and slot connectors on an Altera DE1.

I’ve worked this out in a proof of concept just to see how it looks.


The idea is to place the connectors like this.

Also I’ve got the idea to put Slot1 in a angled possition, so it’s possible to use big cartrides or a slotexpander, without blocking slot 2.

Current status is, that it’s just a Concept but please share your ideas in the comments.