IBM PS/2 MODEL 53 (9553)

Chipset

IBM PS/2 Model 9556/9557 & 53

Sockets

FSB speed

25MHz

Form factor

OEM / Proprietary

Dimensions

330mm x 218mm

Cache

None/Integrated in the CPU

Max RAM size

24MB

RAM type

72-pin FPM

PSU connector

OEM/Proprietary

I/O ports

Floppy interface

IDE interface

PS/2 keyboard

PS/2 mouse

Parallel

Serial

VGA

Expansion slots

16-bit MCA

16-bit MCA with AVE

Also known as:

REPLY CORPORATION TurboProcessor 55
IBM 71G5951

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.