IBM Personal System/2 Model 57 SX
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
| System board memory | Feature Number | Part Number |
| 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 |
| DASD | ||
| 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 |
| Communications | ||
| 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.