IBM PS/2 MODEL 76i/s & 77i/s (Lacuna, IDE+SCSI) (9576, 9577)
Logs
chipChipset
cpuSocket
Socket 3 (PGA237)
speedFSB speeds
25MHz33MHz
moboForm factor
OEM / Proprietary
dimDimensions
330mm x 218mm
chipCache
None/Integrated in the CPU
ramMax RAM size
32MB
ramRAM type
72-pin FPM
pwrPSU connector
OEM/Proprietary
tag Also known as
  • IBM 95G9691 (System Board, 33 MHz only)
  • IBM 96G1305 (System Board, 25 and 33 MHz)
  • IBM 95G9692 (System Board, 33 MHz only)
  • IBM 06H3011 (3V CPU regulator module)
  • IBM 68G2709 (Model 77 riser board, 5 slots)
connI/O ports
1x 
Floppy interface
1x 
IDE interface
1x 
PS/2 keyboard
1x 
PS/2 mouse
1x 
Parallel
2x 
Serial
1x 
VGA
cardExpansion slots
1x 
32-bit MCA with AVE
2x 
32-bit MCA with MME
wrench Known issues
  • Expansion slots are on proprietary riser

The listed slots are on the riser card that came with the motherboard.
If you have this board make sure you have the riser for it.

notes Notes

Please pay attention that U51 is not a normal COAST slot but is for a special IBM cache module

Further info: https://www.ardent-tool.com/76_77/Lacuna.html

Last updated 2026-02-13T21:15:34Z
Board info score is 8.2/10
bios 3 BIOS files available

vendor IBM - 3 entries

POST string
Note
Core Ver.
BIOS Ver.
Logs
POST string
Note
Core version
BIOS version
Logs
POST string
Note
Core version
BIOS version
Logs
POST string
Note
Core version
BIOS version
Logs
drv 5 drivers available
Name
Version
OS support
Size
Filename
Name
Version
Empty
OS support
MS-DOS Windows 3.1x
Size
710KB
Filename
Name
Version
Empty
OS support
MS-DOS Windows 3.1x Windows 9x Windows NT 3.1 Windows NT 3.5x
Size
895KB
Filename
Name
Version
2.01.09
OS support
Windows 9x
Size
124.2KB
Filename
Name
Version
Empty
OS support
Windows NT 3.5x
Size
64.6KB
Filename
Name
Version
2.00.18
OS support
Windows NT 4.0
Size
177.7KB
Filename
doc No board documents available
Chip
Release date
File
Logs
Chip
Release date
1994-05
File
Logs
Chip
Release date
1991-05
File
Logs
Chip
Release date
1992-09
File
Logs
Chip
Release date
1992-09
File
Logs
Chip
Release date
1995-08-05
File
Logs
Family
Release date
File
Logs
Family
Release date
1996-03
File
Logs
Family
Release date
1995-07
File
Logs
Family
Release date
1995-10
File
Logs
Family
Release date
1995-12
File
Logs
Family
Release date
1989-04
File
Logs
Family
Release date
1990
File
Logs
Family
Release date
1992-10
File
Logs
Family
Release date
1992-02
File
Logs
doc 2 other files available
Title
File
Logs
Title
Diagnostics Disk v3.1
File
Logs
Title
Reference Disk v3.10
File
Logs
image1 Image 1 of 10 (Tomas Slavotinek)
image2 Image 2 of 10 (limsup)
image3 Image 3 of 10 (limsup)
image4 Image 4 of 10 (limsup)
image5 Image 5 of 10 (limsup)
image6 Image 6 of 10 (limsup)
image7 Image 7 of 10 (limsup)
image8 Image 8 of 10 (limsup)
image9 Image 9 of 10 (limsup)
image10 Image 10 of 10 (limsup)

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