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

IBM Personal System/2 Model 57 SX

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

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

320x200, 256 colours
640x480, 16 colours

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

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

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


Option Feature Number Part Number
System board memory
IBM Personal System/2 2MB Memory Module Kit-70ns 129 6450902
IBM Personal System/2 4MB Memory Module Kit-70ns 128 6450128
IBM Personal System/2 8MB Memory Module Kit-70ns 5116 6450130
IBM Personal System/2 Micro Channel SCSI Adapter 1005 6451109
IBM Personal System/2 Micro Channel SCSI Adapter with Cache 1018 6451110
IBM Personal System/2 1.44MB 1-Inch High Diskette Drive 30 6451130
IBM Personal System/2 2.88MB 1-Inch High Diskette Drive 1106 6451106
IBM Personal System/2 60MB SCSI Fixed Disk Drive(B,D) 1049 6451049
IBM Personal System/2 80MB SCSI Fixed Disk Drive (D) 1045 6451045
IBM Personal System/2 120MB SCSI Fixed Disk Drive(B,D) 1050 6451050
IBM Personal System/2 160MB SCSI Fixed Disk Drive (D) 1046 6451046
IBM Personal System/2 320MB SCSI Fixed Disk Drive (D) 1108 6451234
IBM Personal System/2 400MB SCSI Fixed Disk Drive (D) 1081 6451235
IBM Personal System/2 Micro Channel SCSI Adapter External Terminator (for F/N 1018) 1039 6451039
IBM Personal System/2 3.5-inch Rewritable Optical Drive 162 6450162
IBM Personal System/2 CD-ROM Drive 1113 6451113
IBM Personal System/2 5.25-inch Slim High Diskette Drive 1066 6451066
IBM Personal System/2 5.25-inch Diskette Adapter/A(A) 1007 6451007
IBM Personal System/2 SCSI Fixed Disk Drive Kit D (B) 1119 6451120
IBM Personal System/2 External CD-ROM Drive 3510-001 3510001
IBM Personal System/2 External Storage Enclosure for SCSI Devices 3511-003 3511003
IBM Personal System/2 4869-001 5.25-inch 360KB External Diskette Drive (A) 4869001
IBM Personal System/2 4869-002 5.25-inch 1.2MB External Diskette Drive (A) 4869002
IBM Personal System/2 Upgrade Kit for Diskette Drives 5106 6451127
IBM PS/2 Model 56 LS Upgrade kit for SCSI Devices 5108 6451129
IBM Personal System/2 Leased Line Modem 1862 26F1862
IBM Personal System/2 Adapter/A for Ethernet Networks 1091 6451091
IBM Personal System/2 Dual Async Adapter/A 1014 6451013
The IBM 3270 Connection 2000 74F3465
System/370(TM) Channel Emulator/A 3205 1674899
IBM System 36/38 Workstation Emulation Adapter 6279 69X6279
IBM PC Network Baseband Adapter/A 1223 1501223
IBM PC Network Adapter II/A (J) 1222 1501222
IBM PC Network Adapter II/A -- Frequency 2 (J) 5647 96X5647
IBM PC Network Adapter II/A -- Frequency 3 (J) 5648 96X5648
IBM Token Ring Network Adapter/A 4790 69X8138
IBM Token Ring Network Adapter/A -- Remote Program Load 8881 25F8887
IBM Token Ring Network 16/4 Adapter/A 1133 16F1133
IBM Token Ring Network 16/4 Busmaster Adapter/A 4041 74F4140
IBM Token Ring Network 16/4 Trace & Performance Adapter/A (H) 5130 74F5130
IBM Personal System/2 300/1200/2400 Internal Modem/A 1755 94X1755
IBM Realtime Interface Co-Processor Multiport/2 (512KB) 6263 09F1897
IBM Realtime Interface Co-Processor Multiport/2 (1MB) 6247 16F1820
IBM Realtime Interface Co-Processor Multiport/2 8 Port RS-232 Interface Board 6265 09F1952
IBM Realtime Interface Co-Processor Multiport/2 8 Port RS-422A Interface Board 6326 15F8852
IBM Realtime Interface Co-Processor Multiport/2 6 Port RS-232C Synchronous Interface Board 6327 15F8861
IBM Realtime Interface Co-Processor Multiport/2 4 Port RS-232 Interface Board 6267 09F1955
IBM Realtime Interface Co-Processor Multiport/2 RS-232/RS-422 Interface Board 6266 09F1958
IBM Realtime Interface Co-Processor Portmaster(TM) Adapter/A (512KB) (J) 6360 53F2601
IBM Realtime Interface Co-Processor Portmaster Adapter/A (1MB) (J) 6364 53F2604
IBM Realtime Interface Co-Processor Portmaster Adapter/A (2MB) (J) 6368 53F2607

Plus many more IBM and 3rd party adapter cards...
Note: Options are no longer available from IBM.

Document ID:  GJAN-43VRDL
Last Modified:  2000-04-13
Copyright © 2000 IBM Corporation

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

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