DPMI apps crash on 486 DX33 \ VOGONS

DPMI apps crash on 486 DX33

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First post, by Zachz91

Posted on 2021-04-01, 16:05

Zachz91 Offline

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I just replaced my 386 motherboard with a 486. It seems that every time I try to execute anything with DPMI, it either locks up (requires power cycle), reboots, or exits with a "Page fault" error message. What can be causing this? Some apps include Borland Turbo C++ 3.0, NASM, and MASM 6.11. It also crashes or reboots when trying to install Linux or NetBSD.

Intel 486DX 33MHz
20 MB 30 pin SIMM RAM (4x4MB, 4x1MB)
MS-DOS 6.22
HIMEM.SYS
CWSDPMI 7
Quantum Bigfoot hard drive
Tseng Labs ET4000AX based video card, 1MB VRAM
GoldStar Prime I/O controller
Adaptec SCSI controller

Reply 1 of 5, by weedeewee

Posted on 2021-04-01, 18:13

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Try running a memtest, or removing the 4x4 or 4x1 or replace completely with four others.

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Reply 2 of 5, by Zachz91

Posted on 2021-04-01, 20:08

Zachz91 Offline

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weedeewee wrote on 2021-04-01, 18:13:

Try running a memtest, or removing the 4x4 or 4x1 or replace completely with four others.

How do you do a memtest?

Reply 3 of 5, by weedeewee

Posted on 2021-04-01, 20:26

weedeewee Offline

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Zachz91 wrote on 2021-04-01, 20:08:

weedeewee wrote on 2021-04-01, 18:13:

Try running a memtest, or removing the 4x4 or 4x1 or replace completely with four others.

How do you do a memtest?

https://www.memtest.org/
I guess you'll want the floppy one, and according to what I've read on the internet and this forum 4.10 (4.20?) should be the latest version that works on a 486.

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
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Reply 4 of 5, by Zachz91

Posted on 2021-04-01, 23:16

Zachz91 Offline

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I tried Memtest. It rebooted on start. After that, I removed the 4x4MB SIMMs and replaced them with 4x1MB SIMMS. Memtest is now 36% through pass 1 with no errors.

Reply 5 of 5, by Zachz91

Posted on 2021-04-02, 14:17

Zachz91 Offline

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It works! Yesterday, I played an MP3 that was decoded to WAV and installed Turbo C++ under Windows 3.1.

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