TriGem Mercury

Chipset

UMC UM82C491/493

Socket

Socket 3 (PGA237)

FSB speeds

20MHz25MHz33MHz40MHz50MHz

Form factor

LPX (max 229 x 330 mm)

Dimensions

Empty

Cache

128KB256KB512KB

Max RAM size

128MB

RAM type

72-pin FPM

PSU connector

AT (P8-P9)

I/O ports

Floppy interface

IDE interface

PS/2 keyboard

PS/2 mouse

Parallel

Serial

VGA

Expansion slots

Empty

Also known as:

TriGem TGSX486/25C
Epson Endeavor 486C
TriGem TGSX486/35C

Known issues:

DALLAS RTC coin cell empty

The motherboard's Real-Time Clock (RTC) chip contains a coin cell that may have drained, causing the loss of CMOS settings. This can result in an inability to save settings, causing system instability or failure to boot. To fix this, the RTC chip can be replaced with an equivalent or repaired by cutting into it and soldering on a new external coin cell holder. Replacement guides are available at https://github.com/necroware/nwX287 or https://github.com/necroware/nw12887, depending on the actual chip used.