Patch for SB20SND.DRV on "faster" CPU. \ VOGONS

Patch for SB20SND.DRV on "faster" CPU.

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First post, by Azami

Posted on 2022-07-29, 23:03

Azami Offline

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The windows 3.1 sound blaster 2.0 driver suffers from a potential divide per zero error if two successive calls to timeGetTime() returns the same value during the driver initialization.

The attachment sb20snd.png is no longer available

This is a patch to fix this, changing the driver to act as if the difference between the two calls was 1ms.

I needed it so I can use LPTDAC.386 on my Armada M700, so let's share it.

Reply 1 of 5, by Kahenraz

Posted on 2022-07-29, 23:23

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Very cool! What is the program there you used to fix the problem that can disassemble and patch a 16-bit binary?

Reply 2 of 5, by jakethompson1

Posted on 2022-07-29, 23:25

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Kahenraz wrote on 2022-07-29, 23:23:

Very cool! What is the program there you used to fix the problem that can disassemble and patch a 16-bit binary?

Looks like Ghidra.

Reply 3 of 5, by Azami

Posted on 2022-07-29, 23:28

Azami Offline

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Yes, it's Ghidra.
Then manual patching with an hex editor.

Reply 4 of 5, by jakethompson1

Posted on 2022-07-29, 23:35

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Azami wrote on 2022-07-29, 23:28:

Yes, it's Ghidra.
Then manual patching with an hex editor.

Nice. I've used IDA a lot but always been frustrated when I attempt Ghidra, particularly with code that doesn't cleanly lie inside any function.
I also just saw your adjustments to PuTTY for Win32s; very nice.

Reply 5 of 5, by Azami

Posted on 2022-07-29, 23:39

Azami Offline

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Thanks!

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