IBM PS/2 MODEL 55SX & 55LS (8555) (Early)
Chipset
Sockets 
FSB speed 16MHz
Form factorOEM / Proprietary
Dimensions330mm x 218mm
Cache
None/Integrated in the CPU
Max RAM size
8MB
RAM type 72-pin FPM
PSU connector
Empty
Multi CPU supportno
I/O ports1x
Floppy interface
1x
PS/2 keyboard
1x
PS/2 mouse
1x
Parallel
1x
Serial
1x
VGA
Expansion slots2x
16-bit MCA
1x
16-bit MCA with AVE
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.
Notes
Further info: https://www.ardent-tool.com/8555/Planar.html
Last updated 2024-07-27T14:55:13Z
Board info score is 8.4/10
Chips
-
Chipset part
-
Human Interface
1 BIOS file available
IBM - 1 entry
POST string
Note
Core Ver.
BIOS Ver.
Logs
No drivers available
2 board documents available
Release date
File
Logs
Chip
Release date
File
Logs
Chip
Release date
1995-11-30
File
Logs
Chip
Release date
1995-11-22
File
Logs
Chip
Release date
1994-07
File
Logs
Image 1 of 5 (Louis Ohland)
Image 2 of 5
Image 3 of 5
Image 4 of 5
Image 5 of 5 (Microhouse)
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