Unisys 4253sx
| Type | MPI 42532 FDD |
| Serial | 430054312 |
| Manufacturer | Unisys Corp., USA |
| FCC ID | N/a |
| Date | April 1993 (MFG date on serial sticker 4/93) |
Physical description
| Type | Desktop |
| Dimensions (HxWxD) | 108 x 380 x 405 mm |
| Drive bays | 2 x 3.5" (1 x half-height internal, 1 x slim), 1 x 5.25" half-height |
| Power supply | 133 W, 100-127/200-240 V, 5/2.5 A, manual voltage switch (9306) |
Main Board
| Manufacturer | Unisys (sticker 03/’93) |
| BIOS | Award Modular BIOS v4.20, 18/8/90 (Unisys ISA BIOS 4 25/33/66 R1.144U), 49 Kb |
| Chipset | VIA VT82C481, VT82C495 |
| Processor | Intel 80486SX-25 MHz (32-bit), PGA |
| Coprocessor | N/a (CPU can be replaced with a 486DX/DX2 up to 33/66 MHz) |
| Memory | 4 sockets for 72-pin SIMMs (*) |
| Max on system board | 64 Mb (4 x 16 Mb) |
| External cache | 256 Kb ADDITION |
| Bus | ISA 16-bit |
| Expansion slots | 3 x 16-bit ISA (on riser card), all available |
| Video | Integrated Super-VGA display adapter (S3 86C805) |
| Interface | Integrated SCSI (Adaptec ASW-B626 - chip Adaptec AIC-6260AL), FDD (2 units) |
| Ports | PS/2 keyboard, PS/2 mouse, 2 serial (UART 16450), parallel, VGA, SCSI |
Cards
| Installed RAM | 4 x 4 Mb 80ns SIMMs (9347 on chips, 9444, two 9313 on card) |
| Ethernet | SMC 8013EWC (1393) ADDITION |
Storage
| Diskette drive | 1.44 Mb, 3.5" slim (Sony MFD-17W, 92-06) |
| Hard disk | Quantum ProDrive ELS-85S (85 Mb) SCSI, 3.5" slim |
Trivia
| Acquisition | Sept. 99, bought together w. some other appliances incl. two 7033 monitors, two 4336 system units and a second 4253 (later demolished to get spare parts), everything was paid a few $ |
| Condition | Very good, working |
| Installed O.S. | MS-DOS 6.20, MS Windows for Workgroup 3.11 (Italian) |
| Modifications | Added two 4 Mb memory SIMMs (it had 8 Mb) and 256 Kb cache |
| Current status | All hw working |
| Current O.S. | MS-DOS 6.0 (US English), MS Windows 3.1 (Italian) |
| Spare parts | Enough to build a second machine, most parts had been tested and are OK |
Notes
(*) apparently, only accepts single-bank SIMMs (1, 4 or 16 Mb).
Peripherals: MONITORS
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This page was first
published on the web on Nov. 11, 2001 |