IBM PS/1 Audio Card.

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Re: IBM PS/1 Audio Card.

Postby Great Hierophant » 2018-12-22 @ 19:47

matze79 wrote:Is there any Documentation how the DAC works ? :)

Ahh i see..
Code: Select all
These two activate the IBM PS/1 Audio Card. It is always situated at ports 0200, 0202-0204, so there's no need for a "base" value.


is it dma driven ? or more like a covox device ?


It's an in-between, think of it like a more capable Disney Sound Source. it uses a 2K FIFO buffer for the DAC and can send an interrupt when the buffer is almost empty. The rate in which the FIFO is sent to the DAC is controlled by an 8-bit timer. The Options from the Technical Reference will tell you how it works : ftp://ftp.mindcandydvd.com/pub/drivers/ ... index.html
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Re: IBM PS/1 Audio Card.

Postby DaveJustDave » 2019-1-03 @ 05:21

Does anyone have the sierra patch utility for this card to enable support on SCI games? I would love a copy
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Re: IBM PS/1 Audio Card.

Postby Cloudschatze » 2019-1-03 @ 05:33

DaveJustDave wrote:Does anyone have the sierra patch utility for this card to enable support on SCI games? I would love a copy

ftp://ftp.oldskool.org/pub/IBM_PC_BBS/ps1/instdrv.exe
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Re: IBM PS/1 Audio Card.

Postby matze79 » 2019-2-15 @ 13:12

I have a PS/1 with PS/1 Audio Card now and test some Stuff.

Is there anyway to access MIDI Devices from DOS ?
i only get it working on Windows 3.x.
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Re: IBM PS/1 Audio Card.

Postby Great Hierophant » 2019-2-15 @ 21:49

matze79 wrote:I have a PS/1 with PS/1 Audio Card now and test some Stuff.

Is there anyway to access MIDI Devices from DOS ?
i only get it working on Windows 3.x.


Are you trying to play a SMF via the PSG on the PS/1 Audio Card or are you trying to access the MIDI ports to send SMF data to a MIDI module? The former requires a driver to translate MIDI commands to the PSG, the latter is unlikely to work unless the program supports PS/1 MIDI, which is not MPU-401 compatible.
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Re: IBM PS/1 Audio Card.

Postby matze79 » 2019-2-16 @ 20:47

I`m trying to get a General MIDI Module to work, but PSG MIDI is also intressenting :)
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Re: IBM PS/1 Audio Card.

Postby Myloch » 2019-2-21 @ 16:54

Myloch wrote:if someone can test a dos game with real ps1 card hardware, please contact me privately.

Here is a video explaining the bug I previously found in kq5 it-fr-ge-sp floppy releases (000.000.148/9 or similar).
When dealing with dosbox-x ps1 emulation, this happens when getting objects: fuckin ugly garbled sound, see the video here. Game bug or ps1 emulation flaw? This is why a check with real hardware is essential.

Matze79 kindly tested this game on real hardware and it seems to work correctly, maybe something is wrong with emulation accuracy.
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