IBM Personal System/2 Model 55 SX
| Machine type | 8555-031 |
| Serial | 55-F6621 |
| Manufacturer | IBM Corp., United Kingdom |
| Date | October 1989 |
Physical description
| Type | Desktop |
| Dimensions (HxWxD) | 102 x 406 x 397 mm |
| Weight | 8.65 Kg |
| Drive bays | 2 x 3.5" half-height, both accessible |
| Power supply | 90 W, 110-220VAC (DATE 9216) REPLACEMENT |
Main board
| Manufacturer | IBM (chips 8943 or earlier), planar id FBFF |
| BIOS | IBM, Nov. 2, 1988 (24/10/89 sticker) |
| Processor | Intel 80386SX-16MHz (32-bit), PQFP |
| Coprocessor | Socket for optional i80387SX Math coprocessor |
| Memory | 2 sockets for 85ns 72-pin SIMMs (PS/2 type), parity checked (*) |
| Max on system board | 8 Mb (2 x 4 Mb) |
| Max. using adapter cards | 16 Mb (about 15,5 Mb usable) |
| Bus | Micro channel (MCA) 16-bit |
| Expansion slots | 3 (16-bit, one w. video ext.) |
| Video | Integrated 16-bit VGA display adapter (256 Kb, max. 320x200, 256 colours or 640x480, 16 colours) |
| Interface | HDD (2 units type ST-506), FDD (2 units) |
| Ports | PS/2 keyboard, PS/2 mouse, serial (UART 16550), parallel, VGA |
Cards
| Installed RAM | 2 x 4 Mb 80ns SIMMs (one has 9051) |
Storage
| Diskette drive | 1.44 Mb, 3.5" slim (Ye-Data YD-701, 89-32) |
| Hard disk | Model WDL-330R (30 Mb), 3.5" slim (8943 on connect.) |
Trivia
| Acquisition | Mid-2000, gift |
| Condition | Very good |
| Installed O.S. | IBM PC-DOS 5.0 (Italian) |
| Repairs/modifications | Replaced 2 Mb memory SIMM with 2 x 4 Mb SIMMs |
| Current status | All hw working |
| Spare parts | Almost everything, incl. drives, planar, etc. |
Notes
(*) 80ns SIMMs OK, does not accept 70ns SIMMs.
Peripherals: KEYBOARDS, MONITORS, MICES, PRINTERS
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This page was first
published on the web on Nov. 11, 2001 |