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First post, by Zachz91

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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

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

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 !
https://www.vogonswiki.com/index.php/Serial_port

Reply 3 of 5, by weedeewee

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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 !
https://www.vogonswiki.com/index.php/Serial_port