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IBM PS/2 (Model 57 SX) - Technical Specifications

Inside the 8557

General information
Machine type: 8557
Announce date: June, 1991

Excerpt from the original announcement letter;

" The IBM Personal System/2(R) Model 57 SX is a Micro Channel(R) system designed to complement and enhance the PS/2(R) Model 55 SX, Model 65 SX and the low end of the Model 70 386 family. It provides product improvements such as increased processor speed, configuration flexibility, 16-bit video graphics array (VGA) graphics and a small computer system interface (SCSI) input/output (I/O) interface. PS/2 Model 57 SX provides a 20-MHz 80386SX microprocessor. Two models are offered with SCSI fixed disk capacities of 80MB (Million Bytes) (8557-045) and 160MB (Million Bytes) (8557-049). PS/2 Model 57 SX features a 5-slot and 4-bay mechanical package. It is designed for desktop operation but ships with a vertical stand, allowing the customer the flexibility of horizontal or vertical orientation. The mechanical package allows for expansion with five 16-bit slots for Micro Channel adapters and four bays for I/O devices. Two of the bays contain a 3.5-inch 2.88MB media sense diskette drive and a SCSI fixed disk. Additional 5.25-inch and/or 3.5-inch devices, diskette drives, fixed disks, tape and CD-ROM drives, and similar devices may be installed in the two remaining bays. The SCSI controller is integrated in the planar so a slot is not required. Up to seven SCSI devices (including the standard SCSI fixed disk) may be attached to the system. Two additional SCSI devices may be attached internally and the remaining devices externally via the external SCSI connector. "

System characteristics
Microprocessor: Intel 80386sx (32 bit)
Clock speed: 20 MHz
Coprocessor: socket for optional 80387
Type of BUS: 16-bit Micro Channel
Total number of expansion slots: 5 (desktop/floorstanding case)
Ports: PS/2 keyboard, PS/2 mouse, serial, parallel, VGA, SCSI

Memory
Min/Max on system board: 4/16MB
Type of memory:
RAM: DRAM (PS/2 72-pin SIMM) 70ns parity checked (3 sockets)
ROM: 128kb
Cache: 0kb L1, 0kb L2

Physical description
Power supply: 197w, 110-220VAC auto sense
Weight: 14.5 kg (32.0 lbs)
Dimensions (HxWxD): (169 x 440 x 394mm)

Mass storage
Drive bays: 4 ( 3 x 5.25" (1 slim height), 1 x 3.5")
Floppy Disk
Size: 3.5 inch slim-height
Capacity: 2.88MB media sense
Hard disk
Size: 3.5 inch half-height
Capacity: 80MB (045), 160MB (049)
Access time: 17ms (80MB), 16ms (160MB)
Interface: SCSI (integrated SCSI controller)

Display
Size:
Display type: Optional Analog CRT
Graphics modes supported: Integrated VGA Display adapter

320x200, 256 colours
640x480, 16 colours

Keyboard
Type: 101 key enhanced, 122 key host connect, 84 key space saving

Software
Operating system: IBM PC DOS Versions 5.0 / 5.00.1 or higher

Configurations
Various memory, diskette drive, hard drive, monitor, and keyboard configurations including;
8557-045 - System Unit 386sx20, 4MB, 80MB, 2.88, 101 keyboard
8557-049 - System Unit 386sx20, 4MB, 160MB, 2.88, 101 keyboard

Options