RAM tester for Moonsound/Wozblaster

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By Alexey

Guardian (1753)

Alexey's picture

26-10-2015, 00:01

I had some issues with my home-made Wozblaster - several samples had crackling noises in them. After a discussion with Eric the broken RAM was suspected. To my understanding there was no RAM testing utility for Moonblaster. However I managed to find a utility that tested the ZX version of Moonblaster. So I took the liberty to make an MSX version of this useful utility.

Currently the utility is being Alpha-tested. The screenshot is from the OpenMSX emulator. While testing on real hardware, I found out that the first RAM bank of my problematic Wozblaster is indeed bad. :(

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By isaiasmalaga

Champion (343)

isaiasmalaga's picture

26-10-2015, 00:45

Hi Alexey:

Good App for test Moonblaster memory!. I'm owner of new FM Blaster from Eric Boer.
Please, Is it available your App for test the FM blaster memory? Let you permit download your App for use with FM Blaster or Moonsound?

Thank you very much!

isaiasmalaga@hotmail.com

By gdx

Prophet (2359)

gdx's picture

26-10-2015, 00:49

Please release it ! Smile

By Meits

Scribe (5213)

Meits's picture

27-10-2015, 02:34

Awkward...
My original Moonsound 2.0 which was repared and upgraded one year ago returns 512kB RAM which is all borked according to this test while the RAM is brand new and twice as big...
Dal-so-ri returned no RAM at all...
Can't test my Wozblaster clone yet... It's on a holiday to have good sound... Dunno when it's going to be back... Never hurry stuff Wink

By Alexey

Guardian (1753)

Alexey's picture

27-10-2015, 02:54

I could only test the tool on my 2 Wozblasters. My friend tested it on his Wozbblaster. And the tool was also tested on 3 FM Blasters. I don't have the original Moonsound, but theoretically clones should be compatible. So no idea why your tests were so weird. Anyone else has the original Moonsound to test?

Please keep in mind that a Wozblaster even with a partially broken RAM will play the music as long as the samples are not loaded into the damaged areas. In games the sound will be perfect, but when using a proper demo, for example "100%" music disk released by Future Crew, some samples will sound really weird with damaged RAM. There will be crackling noises or hissing depending on how badly a chip is broken. Other tunes will play allright - it all depends on RAM usage. So if the test shows a broken RAM, try the FC's music disk. It confirmed the problems discovered by the utility on one of my Wozblasters.

I am going to replace a broken chip on my Wozblaster soon. The test shows that bank1 is completely busted. The tunes are played with crackling noises. But Sonic plays without a problem as it probably doesn't use any RAM. Btw, bank1 corresponds to the right chip on Wozblaster board...

By Meits

Scribe (5213)

Meits's picture

27-10-2015, 02:45

I just tested it in openMSX and it went ok, except that it returned 1024kB RAM while the moonsound in openMSX has just 640kB...

By Alexey

Guardian (1753)

Alexey's picture

27-10-2015, 02:57

The test will not work properly if there is another amount of RAM on board. It supports only 512 and 1024kb versions.

By Meits

Scribe (5213)

Meits's picture

27-10-2015, 19:02

On Moonsound with 640kB RAM everything is well in openMSX while the tester only sees 512kB or 1024kB...
In this case does it only test the first 512kB or does it test the absent 384kB as passed?

By Alexey

Guardian (1753)

Alexey's picture

27-10-2015, 21:08

The tester application works properly if it is allowed to write where it wants to write. So the emulator allows it to write to those extra 384kb correctly. That's why the test is successful.

By Meits

Scribe (5213)

Meits's picture

27-10-2015, 21:22

Nice to know. I'll check with someone who has 640kB in a real Moonsound. If it differs, there's something to do for the openMSX guys... Smile

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