SofaRun, execrom and SDMMR 1024K help needed

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By Druuna333

Supporter (16)

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19-02-2022, 01:39

I finally managed to run a simple rom: "mappy.rom" with LOADROM.
According to the below old forum post maybe I should be in FAT12 and not FAT16 as my MSX2 has only 64k?
I'd like to try but no idea how to do a FAT12: CALL FDISK seems creating a FAT16 Partition by default.

https://www.msx.org/forum/msx-talk/general-discussion/need-h...

By Parn

Paladin (781)

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19-02-2022, 13:08

You need FAT12 if you're dead set on using DOS1, and then you'll be limited to 32MB partitions. Unfortunately I can't help you with that, since I personally don't use FAT12. Anyway, you shouldn't have any problem in using DOS2 with your computer, which makes me believe there's something wrong with your cartridge, or even your computer's internal RAM.

By Manuel

Ascended (18782)

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19-02-2022, 15:05

As Parn says. All that software should work fine under DOS2. And you are already using more than 64kB RAM, because otherwise Nextor/DOS2 wouldn't even work. Part of the RAM of your SDMMR is used. How do you configure the SDMMR RAM?

By Druuna333

Supporter (16)

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19-02-2022, 18:31

The cartridge has 4 switches:
mapper enabled switch 1 down
megaram switch 2 down
switches 3 and 4 not sure what they are I can't read it's sticker unfortunately.
But Parn might be right, probably something wrong with the ram on cartridge (as the msx works fine without cartridge) and even when I boot in DOS1 and load successfully the rom "mappy" with "loadrom" after a while it freezes.
Will try to boot in dos1 and fat12 and try to run again TESTRAM.

By gdx

Enlighted (5489)

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20-02-2022, 08:18

I created a wiki page for the SDMMR 1024K. I hope will help you.

https://www.msx.org/wiki/MetalGear2_SDMMR_1024K

EXECROM seems to need a little update to work fully under Nextor in MSX-DOS2 compatible mode.

By Manuel

Ascended (18782)

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20-02-2022, 11:06

So, use the hybrid mode and you have 512kB RAM needed to run Nextor/DOS2 and then you should be able to load ROM software into the MegaRAM which is in the remaining 512kB.

The freezing is not normal. Make sure you clean the cartridge edge connector and if that doesn't help, and you get no freezes without the cartridge, better contact the seller.

By Druuna333

Supporter (16)

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20-02-2022, 19:33

I manage to create a FAT12 yesterday (FYI: you just have to choose 16Mb as size in FIDSK and it will be a FAT12)partition but seems making no difference still freezing. The only rom I managed to load was "Mappy" with LOADROM but after a few seconds it freezes.
Thanks for the wiki gdx, nice to see yours working so well :-)
Will try in Hybrid mode too, but from gdx's video & wiki and card instructions seems you have to keep it with switch 1 and 2 down:
1: Hybrid mode (512kB Memory Mapper & 512kB Megaram Mapper)
2: Memory Mapper mode only (1024kB)
That's strange as I have only 1024k on the card?

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