SD512 - a short review
Maybe you have some suggestions of getting some more roms to work ? 
It looks a lot like a SD-Mapper. If this is the case, change the memory type switch to "MegaRAM" and use ExecROM to load the ROMs. It works with almost all ROMs unmodified and, for the some that eventually didn't work, you can search for XPS files that fixes the ROM at loading time for you.
Be aware that, changing the 512KB RAM from Memory Mapper to MegaRAM, if your MSX have less than 128KB Memory Mapper you won't be able to load MSXDOS2 or Nextor.
In this case, you will need to boot in MSXDOS1, which doesn't have support for subdirectories. So you need to put all the ROM files and the ExecROM at root of your directory tree.
Maybe you have some suggestions of getting some more roms to work ?
It looks a lot like a SD-Mapper. If this is the case, change the memory type switch to "MegaRAM" and use ExecROM to load the ROMs. It works with almost all ROMs unmodified and, for the some that eventually didn't work, you can search for XPS files that fixes the ROM at loading time for you.
Be aware that, changing the 512KB RAM from Memory Mapper to MegaRAM, if your MSX have less than 128KB Memory Mapper you won't be able to load MSXDOS2 or Nextor.
In this case, you will need to boot in MSXDOS1, which doesn't have support for subdirectories. So you need to put all the ROM files and the ExecROM at root of your directory tree.
Piter,
This interface born as a SD-Mapper clone. The guys @ 8bit4ever asked Fabio Belavenuto about this project and he kindly provided all the needed files. The only issue is that they did not respect the License (CERN Open Hardware) so they forgot to include Fabio's copyright (already fixed now) on earlier batches, and they altered the license when they released an improved version. (If you know him ask about this, he is the kind of person who tries to solve things without making any fuss)
This improved version, AFAIK, have both MegaRAM and Memory Mapper active at the same time (I don't know if there is a 256k+256k version or just the 512k+512k version) so it's a great improvement on user's point of view, but since it is based on Fabio's design it should maintain both original license and Fabio's name.
Maybe you have some suggestions of getting some more roms to work ?
It looks a lot like a SD-Mapper. If this is the case, change the memory type switch to "MegaRAM" and use ExecROM to load the ROMs. It works with almost all ROMs unmodified and, for the some that eventually didn't work, you can search for XPS files that fixes the ROM at loading time for you.
Well I tried doing that, and from the couple of roms I checked the ones that worked with exec rom, are generally the same that work with loadrom. The only one that worked in megaram mode and didn't work with mapper mode is MR. Ghost. I'm still unable to run Manbow 2 and Metal Gear 2 for example.
Also in Megaram mode I cannopt run dsk files wit sofarunit.
Maybe you have some suggestions of getting some more roms to work ?
It looks a lot like a SD-Mapper. If this is the case, change the memory type switch to "MegaRAM" and use ExecROM to load the ROMs. It works with almost all ROMs unmodified and, for the some that eventually didn't work, you can search for XPS files that fixes the ROM at loading time for you.
Well I tried doing that, and from the couple of roms I checked the ones that worked with exec rom, are generally the same that work with loadrom. The only one that worked in megaram mode and didn't work with mapper mode is MR. Ghost. I'm still unable to run Manbow 2 and Metal Gear 2 for example.
Also in Megaram mode I cannopt run dsk files wit sofarunit.
I'm not sure about Metal Gear 2, but for Manbow 2 you should use a MegaFlashROM, either the one manufactured by Manuel Pazos, or the one you take a Konami Cartridge apart remove the maskROM and install a 512kbit AMD FlashROM.
