IBM PC 330 433sx + SB AWE 64 and MPU \ VOGONS

IBM PC 330 433sx + SB AWE 64 and MPU

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First post, by Ragh

Posted on 2014-11-01, 14:48

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In the past I've had a problem getting my AWE 64 to output sound when used in conjunction with a MPU card. That issue was solved by changing the SB's 330 port to 300. (See AWE 64 no sound with mpu-401 isa card in DOS).

Now, I've purchased an IBM PC 330 433sx (486sx 33 processor, 3x isa slots, etc.), similar to this one: http://mastodonpc.tripod.com/personal/6571-l3b.html to which I have transplanted the aforementioned ISA cards. I am having similar issues where the AWE doesn't want to output any sound and MIDI via the MPU card works as expected. I have tried to setup the sound blaster card to the same settings as in my previous PC, but to no avail.

The CTCU utility reports that there is a conflict when selecting DMA 1 (DMA 1 conflicts with System Device settings). I can select wither DMA 0 or 3. I can't possibly find out which device is using DMA 1. I can't find anything in the BIOS config and I've been fiddling with motherboard jumpers by looking at a schematic label attached to the inside of the computer case. The only jumper setting mentioned in that schematic is "DMA CH1 ECP", but it doesn't do anything to free DMA 1 afaik.

Any one here with an IBM PC 330 or similar having successfully setup this?

Reply 1 of 13, by PeterLI

Posted on 2014-11-01, 15:43

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Last edited by PeterLI on 2016-12-15, 19:56. Edited 1 time in total.

Reply 2 of 13, by Ragh

Posted on 2014-11-01, 15:51

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I have disabled both LPT and COM ports, so this shouldn't be an issue?

Reply 3 of 13, by PeterLI

Posted on 2014-11-01, 22:20

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Reply 4 of 13, by Ragh

Posted on 2014-11-01, 22:33

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Yes, the same problem happens if I either disable the LPT altogether or set it to "Standard mode" instead of "Extended mode".

I am using a MPU 401 ISA MIF IPC clone card (the one selling cheap on eBay: http://www.ebay.com/itm/MPU-401-INTELLIGENT-I … =item3ceabb3ee5).

Perhaps another thing to note is that I still can't get any sound (in games) out of my SB card, no matter what IRQ/DMA settings I choose.

Reply 5 of 13, by Ragh

Posted on 2014-11-02, 08:28

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Filename: IMG_0010.jpg
File size: 779.54 KiB
Downloads: No downloads
File license: Fair use/fair dealing exception

I've attached the schematic label found on the machine in case it helps. Does anyone know where can I find the manual for this PC?

Reply 6 of 13, by PeterLI

Posted on 2014-11-02, 17:33

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Reply 7 of 13, by Ragh

Posted on 2014-11-03, 13:19

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Thanks for the manual, even though this is for later pentium models.

Yes, I have a MPU-401 connected to the card.

Reply 8 of 13, by paulisthebest3uk

Posted on 2016-03-19, 18:28

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I know this is quite an old thread but did you ever sort this out? I have the same system and on mine, DMA channel 1 is also unavailable. I really need DMA 1 freed up so I can play on old games with full sound support such as Dyna Blaster...

Reply 9 of 13, by Ragh

Posted on 2016-07-26, 13:20

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Only seeing your post now, paulisthebest3uk and I haven't figured out the issue. I have since installed the AWE in another machine. I am waiting for a SB16 to arrive and will test the configuration with it once it arrives. Will report here.

Reply 10 of 13, by Ragh

Posted on 2020-10-11, 14:42

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Resurrecting an old thread, reporting finds from memory. Got a SB16 installed, the creative diagnose utility reports everything is ok, sound samples work fine. No game has any sound though.

Reply 11 of 13, by InbetweenDays

Posted on 2020-10-11, 15:06

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Thanks for the update. I've just been having the same issue. Win95 reports that the floppy drive controller is using DMA 1, not 2 as it should (and the setting cannot be changed). Device manager reports DMA 2 as being "in use by unknown device".
I wondered if it might be a Win95 issue, but CTCU running under DOS 6.22 also reported DMA 1 as being in use.
Interestingly though, the IBM diagnostics disk correctly reported DMA 1 as being free and DMA 2 being in use by the floppy controller.
(Diags disk: lkgt35a.exe found here)
Reserving DMA 1 in the BIOS doesn't help. I also tried updating the BIOS with no success (lejt67a.exe, same location)

So in the end I went back to a non PnP soundcard... jumpered with the usual settings (220/5/1/5). Everything works in DOS and Win95, even though device manager does report a conflict when you view the resource settings.

It don't mean a thing if it ain't got 5-pin DIN.
Roland addict and founding member of the Association Of Molex Haters

Reply 12 of 13, by paulisthebest3uk

Posted on 2020-12-28, 13:59

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Oh this thread is active again? Thats cool, yep it does seem DMA1 is handling the floppy controller, why that is i have no idea, at first i thought it was a bad motherboard in my machine, but as other people are having the same issue. The AWE32 ive been trying to use just doesnt work propelery which is annoying as its a really nice 486 machine

Reply 13 of 13, by evasive

Posted on 2021-12-30, 14:17

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We have the PC 330 6571 board listed here:
https://www.ultimateretro.net/en/motherboards/2944

If any of you could provide us with a clearer picture or at least chipset info that would be nice.

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