Cyrix 66MHz PC

A 486DX2-based PC from ca. 1994. It has HOT-409 2.2 mainboard wih Cyrix processor, 8MB of RAM and sound card with CD-ROM. Contains quite high-end Trident VLB graphics board and Artisoft network card I haven't managed to get working. Its hard disk is 540MB, WD Caviar. Graphics board allows to get 800x600 with 16-bit color and because it's VLB its speed is quite high comparing to typical Trident on ISA.
The computer runs with MS-DOS 6.22 and Windows 3.11. It theoretically can run Windows 95, but amount of RAM is relatively small for it.

Approx. year 1995

Class AT
CPU Cyrix 486DX2
Speed 66MHz
RAM 8MB (8x1MB, SIMM30)
Mainboard Shuttle HOT-409 2.2 (TH99)
(non-ZIF socket)
Graphics Trident TVGA9200CXr, 1MB, VLB, as bus master.
Sound Labsound 503 (TH99) with game port and IDE controller. ES1688-based.
Ports I/O Unknown, similar to Prime 2C MKIII (TH99), 16-bit ISA
Network Artisoft, BNC, based on Artisoft ALICE chip, 16-bit ISA
System expansion bus 16-bit ISA
(2 VLB slots)
Floppy/removable media drives 1x 3.5" 1.44MB floppy disk drive

Hard disks/ATA devices: WD Caviar 540MB, ATA.
Quad-speed CD-ROM drive.

Peripherals in collection:
 - None

Other boards:


Casing Standard small AT tower
Non-standard expansions: None
Operating system(s): MS-DOS 6.22 + Windows 3.11 For Workgroups

Contents: Starting, usage Drivers Links


The mainboard has 256kB of cache. In Setup, its timing can be set to the best one (0WS, 2-1-1-1) without problem if CPU is 66MHz. Graphics board - TVGA9200CXr - must be set to clock lower than 33MHz.

There are no other problems or caveats during installation





ES1688 for Windows 3.x and 95 (if Win95 has no drivers)
TVGA9200CXr for DOS, Windows 3.x and 95 - DOS tools on 3.x disk.





Links: - Shuttle HOT-409 page. Unfortunately manual inaccessible.