How to set up Roland MPU-IPC-T in Windows 98 for DOS games? \ VOGONS

How to set up Roland MPU-IPC-T in Windows 98 for DOS games?

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First post, by eddman

Posted on 2023-12-30, 20:14

eddman Offline

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I'm doing it in 86Box, but the procedure doesn't differ with real hardware.

The card works in real DOS and games detect it, and after installing its driver it also works in Windows 98 and native windows games (e.g. Hexen II) play MIDI just fine. However, I get no sound in DOS games running in the windows environment (Duke 3D simply says could not detect MPU-401), which has to be because I haven't added its parameters to autoexec.bat.

The problem is I don't know how it needs to be written. The IRQ is 7 and the address is 320.

Anyone got any insights?

Reply 1 of 4, by Shponglefan

Posted on 2023-12-30, 20:29

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MPU-401 interfaces shouldn't require anything in AUTOEXEC.BAT.

It's about setting the game's audio settings to the correct MIDI settings. In this case IRQ 7 and address 320.

Note that those are slightly unusual settings for a MPU-401 device. Typically the standard setting is IRQ 2 and address 330. If the game doesn't allow you to set custom settings then it's possible it can't find the card because it's looking for the wrong IRQ and address.

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486 DX4-100 with 6 sound cards
486 DX-33 with 5 sound cards

Reply 2 of 4, by eddman

Posted on 2023-12-30, 20:41

eddman Offline

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Wouldn't IRQ 2 be an issue, since it's used by "Programmable interrupt controller", whatever that does?

That's why I chose IRQ 7. I had to choose address 320 because 330 is taken up by SB16. Duke doesn't allow changing the IRQ for MIDI, only the address.

I switched the card to IRQ 2 and yea, it works, and there don't seem to be any immediate problems.

Reply 3 of 4, by Tempus

Posted on 2023-12-31, 00:51

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Some cards like my LAPC-I have a static IRQ 2/9, where the jumpers normally be are just shorted instead. The LAPC-I has an MPU-401 interface. J01 equals IRQ 2/9.

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Reply 4 of 4, by Shponglefan

Posted on 2023-12-31, 02:21

Shponglefan Offline

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eddman wrote on 2023-12-30, 20:41:

Wouldn't IRQ 2 be an issue, since it's used by "Programmable interrupt controller", whatever that does?

That's why I chose IRQ 7. I had to choose address 320 because 330 is taken up by SB16. Duke doesn't allow changing the IRQ for MIDI, only the address.

I switched the card to IRQ 2 and yea, it works, and there don't seem to be any immediate problems.

The programmable interrupt controller is just the thing that handles interrupt requests. Not all games require or utilize an interrupt for MPU-401 usage, although some do.

When you say you've switched it and it works, does this mean it works in Duke 3D and you can get MIDI playback?

Pentium 4 Multi-OS Build
486 DX4-100 with 6 sound cards
486 DX-33 with 5 sound cards

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