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IBM PS/2 (Model 50 Z) - Technical Specifications

General information
Machine type: 8550
Announce date: June 2, 1988

Excerpt from the original announcement letter;
"The new IBM Personal System/2 Models 50 Z will enhance the IBM Personal System/2 Family of desktop systems by offering improved performance and hardfile capacity. The systems are highlighted by the Micro Channel (TM) Architecture with a 10Mhz 80286 16 bit microprocessor, high density memory technology, and a wide range of integrated features. New high speed (85ns) memory will provide zero wait state processor performance and may be upgraded for 2MB of memory on the system board. New 30MB (50-031) and 60MB (50-061) hardfiles provide greater capacity and improved average access time over the 8550-021. These systems maintain compatibility with most PS/2 Model 50 features and Operating Systems."

System characteristics
Microprocessor: Intel 80286 (16 bit)
Clock speed: 10 MHz, zero wait state
Coprocessor: socket for optional i80287 math coprocessor
Type of BUS: 16-bit MCA (Micro Channel)
Total number of expansion slots: 4
Ports: PS/2 keyboard, PS/2 mouse, serial, parallel, VGA

Memory
Min/Max on system board: 1/2MB (16MB max. using adapter cards)
Type of memory:
RAM: DRAM (PS/2 72-pin MMK) 85ns or 120ns parity checked
ROM: 128kb
Cache: n/a

Physical description
Power supply: 94w, 110-220VAC auto sense
Weight: 9.55 kg (21 lbs)
Dimensions (HxWxD): (140 x 360 x 420mm)

Mass storage
Drive bays: 3 3.5" half-height
Floppy Disk
Size: 3.5 inch half-height
Capacity: 1.44MB
Hard disk
Size: 3.5 inch half-height
Capacity: 30MB (39ms) / 60MB (27ms)
Access time:
Interface: ST-506 (30MB), ESDI (60MB) PS/2 model 50 connector

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

Software
Operating system: IBM PC DOS Versions 3.30 or higher

Configurations
Various memory, diskette drive, hard drive, monitor, and keyboard configurations including;
8550-031 - System Unit 286-10Mhz,1MB,30MB,1.44MB
8550-061 - System Unit 286-10Mhz,1MB,60MB,1.44MB

Options
Personal System/2 80287 Math Co-Processor (#6450356)
Personal System/2 80286 Memory Expansion Option (#6450344)
Personal System/2 80286 Memory Expansion Kit (#6450345)
Personal System/2 1.44MB Diskette Drive (#6450353)
Personal System/2 Mouse (#6450350)
Personal System/2 Dual Async Adapter/A (#6450347)
Personal System/2 Multi-Protocol Adapter/A (#6450348)
Personal System/2 300/1200 Internal Modem/A (#6450349)
Personal System/2 Monochrome Display 8503 (8503001)
Personal System/2 Color Display 8512 (8512001)
Personal System/2 Color Display 8513 (8513001)
Personal System/2 Color Display 8514 (8514001)
Personal System/2 5.25-inch External Diskette Drive Adapter/A (#6450245)
Personal System/2 3117 Adapter/A (#65X1925)
Personal System/2 High Speed Adapter/A (RS-422A)(#65X1905)
IBM 6157 Tape Drive Adapter (#92X1458)
Personal System/2 Display Adapter 8514/A (#1887972)
Personal System/2 8514 Memory Expansion Kit (#1887989)
IBM 3270 Connection (#83X9702)
System 36/38 Work Station Emulation for the Personal System/2 /A Installation Convenience Kit Version 1.0 (#69X6287)
System 36/38 Work Station Emulation for the Personal System/2 /A Adapter & Quick Reference (#69X6279)
Personal System/2 PC Network Baseband Adapter/A (#1501223)
Personal System/2 PC Network Adapter II/A (#1501222)
Personal System/2 Token-Ring Network Adapter/A (#69X8138)
Personal System/2 Data Migration Facility (#1501224)

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