IBM Personal System/2 Model 77 486

Machine type 9577-0UA
Serial 55-1G140
Manufacturer IBM Corp., United Kingdom
Dated Feb. 1994

Physical description

Type Desktop (may be converted to Floor standing) (sticker inside top cvr 23.2.94)
Dimensions (HxWxD) 169 x 440 x 394 mm
Weight 12.6 Kg
Drive bays 1 x 3.5", 3 x 5.25", all accessible
Power supply 197W 110/220VAC switchable (9402)

Main board

BIOS IBM, Oct. 28, 1992 (92 Kb), planar id DEFE
Processor Intel 80486SX-33 MHz (32-bit) PQFP
Coprocessor Socket for 80487DX (*)
Cache N/a
Memory 4 sockets for 70ns 72-pin parity checked SIMMs (PS/2 type)
Max on system board 32 Mb (2, 4 or 8 Mb SIMMs)
Bus MCA 32-bit 
Expansion slots 5 x 32-bit (2 w. video ext.), on riser card
Interface Integrated SCSI contr., FDD (2 units)
Ports PS/2 keyboard, PS/2 mouse, 2 buffered serial (UART 16550A), parallel, SCSI


Installed RAM 4 x 8 Mb, 70ns SIMMs (all und.)
Video IBM 32-bit XGA Display adapter (FCC ID ANO 87F4773, chips sticker 09/12/93)


Diskette drive 2.88 Mb, 3.5" slim (Mitsubishi MF356F, DEC. 1993)
Hard disk Quantum ProDrive LPS240S (240 Mb) SCSI, 3.5" slim (late 1993, cables WK 08/94)


Acquisition May 2000, bought for a few $ together w. some other appliances, including PS/2 system units and 8514 monitors
Condition Very good, working
Installed O.S. None
Repairs/modifications Added 2 x 8 Mb memory SIMMs (it had 16 Mb only)
Current status All hw working
Current O.S. MS DOS 6.22, MS Windows for Workgroup 3.11 (Italian)
Spare parts Drives, power supply, accessories


This is an earlier 8577 machine, nicknamed "Bermuda" (later models are called "Lacuna"). Model code 0xx indicates no O.S. was originally installed.


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This page was first published on the web on Nov. 11, 2001
Last revised May 24, 2004