SX-1+ Mini with MegaFlashRom SCC+ SD problem(s)

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By SjaaQ

Master (203)

Аватар пользователя SjaaQ

09-10-2020, 15:08

I am currenly running 3.8.1 Kdl compiled from source. But I don't have the problem.

I am curious to find out what version was shipped. The only you can download from 8bits4ever is only marked "Custom_Firmware_KdL_3.8" which is not really a version released by Kdl. I was not aware at the time there was a command to get the version "FIRMINFO.COM".

By SjaaQ

Master (203)

Аватар пользователя SjaaQ

09-10-2020, 15:16

Just flashed back to the downloadable version which reports "OCM-PLD version 3.8 by KdL". Tested for some restarts with the MFR, but it did not show the problem.

By SkalTura

Champion (315)

Аватар пользователя SkalTura

10-10-2020, 08:21

Guillian wrote:

Does it fail on a cold boot (power on), but works fine on warm boots (reset)?

Most of the times it starts normally on a cold boot (including the extra memory of the MFR, but not always.
Sometimes the SX1 shows the boot logo and the extra memory, but freezes.
Sometimes the SX1 freezes without showing the boot logo.
Sometimes the SX1 shows the boot logo without the extra memory, then it startsup in Basic without the MFR.

On a warm start, after pushing the reset button, most of the time the same results as before...
So a bit random unfortunately.

The MFR shows version 1.4 at startup

By SkalTura

Champion (315)

Аватар пользователя SkalTura

10-10-2020, 09:13

Note: Because I'm colorblind, and the yellow color of the multirom select menu was difficult to see, I got a modified version with blue instead of yellow for selecting the games.
Doubt if that has anything to do with it, but thought I'd mention it just in case...

By SkalTura

Champion (315)

Аватар пользователя SkalTura

10-10-2020, 11:35

Update: Tried 3 different power supplies/USB cables, all same results.
I did find that the USB connector of the SX1 doesn't grip the cables very tightly in comparison with other USB devices.

By Guillian

Prophet (3411)

Аватар пользователя Guillian

10-10-2020, 13:15

SkalTura wrote:

Note: Because I'm colorblind, and the yellow color of the multirom select menu was difficult to see, I got a modified version with blue instead of yellow for selecting the games.
Doubt if that has anything to do with it, but thought I'd mention it just in case...

Ah, yes! I remember doing it. But that does not affect the boot process.

If the problem occurs both in cold and warm boots, then it is not related to FPGA configuration time but, probably, to slot signals.

Try cleaning the cartridge contacts. If that does not solve the problem, then I would check slot signals voltages.
I'm assuming that the slot signals /CLK, /RD, /WR, etc. are correct and synchronized.

By SkalTura

Champion (315)

Аватар пользователя SkalTura

10-10-2020, 13:29

Guillian wrote:

Ah, yes! I remember doing it.

Good memory... That was about 6 years ago ;-)

I will try cleaning the contacts and measuring the voltage on the slot signals...

By SkalTura

Champion (315)

Аватар пользователя SkalTura

11-10-2020, 11:44

Without the MFR inserted.
Booted in Basic, the voltages are:
/RD: 1,77v
/WR: 3.24v
/CLK: 1.72v
+5V: 4.9v
-12V: -12.3v
+12v: 12.5

With the MFR inserted.
Booted normally in the MultiBoot menu, the voltages are:
/RD: 1,76v
/WR: 3.36v
/CLK: 1.74v
+5V: 4.8v
-12V: -12.3v
+12v: 12.1v

With the MFR inserted.
Failed boot, hangup without showing boot logo, the voltages are:
/RD: 2,46v
/WR: 2.94v
/CLK: 1.73v
+5V: 4.8v
-12V: -12.2v
+12v: 12.4v

Note: Cleaning the cartridge didn't do anything...

So apart from this unpleasant behavior...
Any suggestions for problem 2, that some games won't start on the SX-1 but do on a "real" MSX machine ?

And I also noticed that when I insert my Cherry PS/2 keyboard the SX-1 acts like some keys are stuck and goes banana's...
Don't have another keyboard to try (yet), so let's ignore this problem for now...

By SjaaQ

Master (203)

Аватар пользователя SjaaQ

12-10-2020, 08:39

I am out of ideas. I have tested 2 different keyboards (Leopold FC750 and a BenQ A122) but did not experience any problems. I can test the ROM you mentioned but I suspect there is something else wrong with your setup.

Not familiar with DIX. As far as I can see, it is a disk based game? The SX-1 does not have any floppy drives. Maybe this has something to do with it. Happy to test DIX on my setup if you can post some instructions on how you flashed it to the MFR?

By SkalTura

Champion (315)

Аватар пользователя SkalTura

12-10-2020, 08:42

SjaaQ wrote:

I am out of ideas. I have tested 2 different keyboards (Leopold FC750 and a BenQ A122) but did not experience any problems. I can test the ROM you mentioned but I suspect there is something else wrong with your setup.

The MFR works fine in my Sony, so I doubt that there is a problem with this.

SjaaQ wrote:

Not familiar with DIX. As far as I can see, it is a disk based game? The SX-1 does not have any floppy drives. Maybe this has something to do with it. Happy to test DIX on my setup if you can post some instructions on how you flashed it to the MFR?

I converted the game to a ROM to load in the MFR, and it works on the Sony...

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