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Personal System/2 50
Technical reference
IBM Personal System/2 50 Technical Reference
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Contents
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Table of Contents
Table of Contents
Section 1. System Overview
Description
System Board Features
1-1. Model and Submodel Bytes
1-2. System Board Devices and Features
System Board Block Diagram
System Board I/O Address Map
Specifications
1-5. Performance Specifications - Type 1 System Board
1-6. Performance Specifications - Type 2 System Board
1-7. Physical Specifications
Programmable Option Select
Description
Section 2. Programmable Option Select
POS Address Map
Card Selected Feedback
System Board Setup
Card Selected Feedback Register (Hex 0091)
System Board Enable/Setup Register (Hex 0094)
System Board POS Register 2 (Hex 0102)
2-4. System Board
2-5. Parallel Port Select Bits
P~S Register 2 (Hex 0102)
System Board POS Register 3 (Hex 0103)
System Board POS Register (Hex 0103)
Adapter Enable/Setup Register (Hex 0096)
System Board
Description
Micro Channel
Adapter Identification
Central Arbiter
Arbitration Bus Priority Assignments
Arbitration Register, Write to Hex 0090
Arbitration Register, Read Hex 0090
Central Arbiter Programming
Memory
Read-Only Memory Subsystem
Random Access Memory Subsystem
System Memory Map
System Memory Maps
System Board Memory Connector, Type
System Board Memory Connector
System Board Memory Connector, Type
3-7. Presence Detect Encoding
Real-Time Clock/Complementary Metal-Oxide Semiconductor RAM
RT/CMOS RAM Address Map
RT/CMOS Address Register and NMI Mask (Hex 0070)
RT/CMOS Data Register (Hex 0071)
RT/CMOS RAM I/O Operations
3-11. Real-Time Clock Bytes
Status Register a
Status Register B
Status Register C
Status Register D
Diagnostic Status Byte
CMOS RAM Configuration
Diskette Drive Type Byte
Equipment Byte
Miscellaneous System Functions
Nonmaskable Interrupt
System Control Port B (Hex 0061)
System Control Port a (Hex 0092)
Power-On Password
Type 2 Serial Port Controller
Hardware Compatibility
Index
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