IBM Personal System/2 Model 56 SX/LS
General information
Machine type: 8556
Announce date: October, 1991
Excerpt from the original announcement letter;
"The IBM Personal System/2(R) Models 56 SX and 56 LS are three-slot, two-bay Micro Channel (R systems designed to provide a small footprint, low price general business and Local Area Network (LAN) workstation solution. The PS/2 Models 56 SX and 56 LS are positioned between the Model 55 SX/LS and Model 57 SX of the low end Micro Channel (R) systems. The PS/2 Model 56 LS system units (24X) are shipped with all of the standard features of the Model 56 SX with the following exception: no DASD devices are installed in this medialess system, but a 16/4MBbps Token Ring network card with RIPL (24X) occupies one of three slots. The PS/2 Model 56 LS is fully upgradable to the Model 56 SX configurations. "
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: 3 (desktop case)
Ports: PS/2 keyboard, PS/2 mouse, serial, parallel, VGA,
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: 118w, 110-220VAC auto sense
Weight: 10.9 kg (24.0 lbs)
Dimensions (HxWxD): (115 x 360 x 395mm)
Mass storage
Drive bays: 2 ( 5.25" (2 accessible))
Floppy Disk
Size: 3.5 inch slim-height
Capacity: 2.88MB media sense
Hard disk
Size: 3.5 inch half-height
Capacity: 0MB (24x), 40MB (043), 80MB (045), 160MB (049),
Access time: 8.3ms
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
Software
Operating system: IBM PC DOS Versions 5.0 or higher
Configurations
Various memory, diskette drive, hard drive, monitor, and keyboard configurations including;
8556-043 - System Unit 386sx20, 4MB, 40MB, 2.88, 101 keyboard
8556-045 - System Unit 386sx20, 4MB, 80MB, 2.88, 101 keyboard
8556-049 - System Unit 386sx20, 4MB, 160MB, 2.88, 101 keyboard
8556-24X - System Unit 386sx20, 4MB, Token Ring 16/4, 101 keyboard (medialess workstation)
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 |
Note: Options are no longer available from IBM.