IDT 200MHz Tower
You can't afford Pentium II or Celeron? You stay with
Pentium I MMX. You want over 200MHz even cheaper? You can buy a
non-Intel CPU. That's an example of such computer, with IDT CPU, being
offered sometimes as a base and sometimes as an upgrade for Socket 7
mainboards for a sohrt time between 1997 and 1998. The mainboard is a
typical "PC-Chips-like" but branded Matsonic, with a sound chip
built-in. It has also USB and game port, being AT form factor with
possibility to connect ATX power supply unit.
The video board - Matrox Mystique - is quite good board for its time. It allows to have some acceleration and even play some games in 3D.
|CPU||Intel WinChip C6|
|RAM||64MB DIMM PC66|
|Sound||OnBoard CMI8330 sound chip
(Win98: drivers needed)
|Ports I/O||Onboard (2x COM 1x LPT,
2x IDE, 1x FDD, PS/2, USB)
|Network||Realtek RTL8029AS (PCI)
|System expansion bus||3x 16-bit ISA slot
4x PCI slot
|Floppy/removable media drives||1x 3.5" 1.44MB floppy
|Hard disks/ATA devices:||
4GB hard disk
Peripherals in collection:
|Casing||Standard small AT tower with ATX PSU|
|Operating system(s):||Windows 98SE|
The mainboard starts normally, there are two BIOS setups
possible: In earlier versions it's a typical AMI with pseudo-windowed
GUI (older versions like 071595). With newer it's text mode. While using DIMMs RAM settings can be
The CPU is set from BIOS Setup.
To make sound work it may be needed in Windows to change its resources from configuration "000000" to "000001" or something like this. If during playing sound it stutters, there is definitely some hidden resource conflict which has to be fixed this way.
The manual does not specify pinouts for sound connector, here is my attempt to discover these. The sound connector is the same as gameport, but after a missing pin:
. . .
o o < GEMAPORT...
o o < GAMEPORT...
?-> o o <--GND
o o <-- ???Input???
o o <-- GND (2x)
L R <--Output
|MS-5025s BIOS and manual can be downloaded on its page (archived, scroll to the bottom), if it's not found, choose a different date.|
|Matrox Mystique has its drivers in Win98. The same as Realtek network board.|
http://www.vgamuseum.info/index.php/cpu/item/205-matrox-mga-1064sg-mystique - Matrox Mystique extended information.