The Big MegaFlashROM SCC+ SD Topic

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Por Guillian

Prophet (3516)

imagem de Guillian

15-07-2015, 16:42

The cartridge is quite picky about voltages. So if the slot is dirty or the PSU is not working 100% (some computers could have problems after beign used for some time) that could cause the flashing problem.
Probably it is not related to SD card, ROM files, etc.

Try the cartridge in a different slot and/or other MSX (in case you have another, of course).

Por SkyeWelse

Champion (471)

imagem de SkyeWelse

15-07-2015, 17:01

Ah, that's interesting. So perhaps if I were to use my Japanese MSX (Turbo R GT) on a U.S. outlet (120 volts) without doing a Step-Down to 100 volts like I do now, (Or if the PSU was getting extra stress, not working correctly) I might possibly see some irregular activity with the MegaFlashRom?

-Thomas

Por SamIAm

Rookie (21)

imagem de SamIAm

15-07-2015, 17:04

Quote:

Manuel can probably clarify further, but I doubt the Turbo/Rensha slider would have an effect on the loading process since that is typically used for auto-fire purposes iirc, not speeding up the processor speed.

Actually, my system has a second slider that seems to control CPU speed.

I just cleaned the connectors thoroughly with alcohol and a cloth. I also reformatted my SD card and dropped only a couple of roms in. It did not help. The cart slot pins all look clean, undamaged, and unbent.

My procedure is this:

System auto-loads to Multimente
I press SHIFT X to open command line
I type OPFXSD B:ROMNAME.ROM
I press enter

It fails maybe 50% of the time this way. If I include /1 in the command line, it fails much less often.

For example, I just tried Dragon Quest 2. It froze at o.......... once, and it loaded successfully once. It also froze once at .............. (no o's) when I tried it without the /1 function. I have been dealing with this problem since I first started using the cartridge.

Should I try it within the MSX-DOS command line only?

Also, is there a list of which games use which mappers? I would like to try to force certain mappers just in case that helps.

By the way, I am using a Japanese system in Japan, so it shouldn't be a local voltage problem. I will try the other cart slot tomorrow.

Thank you!

Por Guillian

Prophet (3516)

imagem de Guillian

15-07-2015, 17:14

For an easier way of flashing the games, just press "2" in MultiMente to select B: drive. Then navigate using cursors to the ROM/DSK and press RETURN on it to flash the game.

I think problem is not related to mapper type, ROM file, or MSX-DOS enviroment, but to slot signals.
When using /1 option the flashROM is flashed slower and using less voltage.

An user reported a similar problem some time ago. He said he has that problem after using the MSX for an hour or more. But if he use the cartridge in another computer, it works fine. So in that case it was a problem of the PSU or other component in his computer.

Por SkyeWelse

Champion (471)

imagem de SkyeWelse

15-07-2015, 17:18

SamIAm, what happens when you hit the "2" key on your keyboard to manually navigate inside of the Multimente filing system to read your B: Drive and highlighting a rom there and hitting the Return key? This is how I normally load roms/disks, etc.

-Thomas

Por SamIAm

Rookie (21)

imagem de SamIAm

16-07-2015, 01:17

Quote:

For an easier way of flashing the games, just press "2" in MultiMente to select B: drive. Then navigate using cursors to the ROM/DSK and press RETURN on it to flash the game.

That is what I did initially, but it didn't work very often. Using the command line and /1 is much more reliable.

I just tried it in a different slot without the /1 command, and it didn't work. It failed midway through a load.

I don't have access to another MSX computer. Sad

Do you think that the problem could be related to capacitors in the power supply going bad? I'm not scared to replace a couple of capacitors.

Por Guillian

Prophet (3516)

imagem de Guillian

16-07-2015, 09:15

I'm not sure if the problem is in the capacitors, but try to have a look on them to check if they are in good shape.

Por SamIAm

Rookie (21)

imagem de SamIAm

16-07-2015, 12:50

I will do that.

Luckily, I found a place right next to where I work that has an excellent selection of capacitors.

If it is not a problem with the capacitors, do you have any other suggestions?

Por Guillian

Prophet (3516)

imagem de Guillian

16-07-2015, 14:06

What MSX model are you using? A F1-XDJ?

I'm testing on that model right now and seems to work fine. I have flashed a 512K ROM 5 times without problem.

Quote:

If it is not a problem with the capacitors, do you have any other suggestions?

If the slots and cartridge pins are clean, the SD card pins are clean, the capacitors are right and you are using a F1-XDJ, then I'm out of ideas ^^!

Por SamIAm

Rookie (21)

imagem de SamIAm

17-07-2015, 02:10

Update:

I opened the system up and took a look at all the caps. Fortunately or unfortunately, I saw no signs of decay - no leaking, no bulging. If you told me that they were replaced last month, I would believe you. Based on pictures I have found of the motherboard, though, I don't anyone has ever replaced any of them

I wrote down a list of all the different caps in there, and I intend to go buy them soon. By the way, should I change that huge 16v 22,000uF capacitor at the power supply? It looks like it might be tricky to get out.

My disk drive is dead, so I went ahead and took that out altogether. It needs a new belt, and a good cleaning, too.

I came upon a source of very reliable roms to test, so I can at least eliminate the "bad-file" factor.

However, I still experienced a freeze. I will do more testing, but I am thinking that I ought to replace the caps.

Any thoughts?

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