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Personal System/2 50
Technical reference
IBM Personal System/2 50 Technical Reference
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Technical reference
(62 pages)
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Contents
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Table of Contents
Table of Contents
Section 1. System Overview
System Board I/O Address Map
Description
Model and Submodel Bytes
System Board Features
System Board Block Diagram
Physical Specifications
Acoustical Readings
Power Supply
Outputs
Component Maximum Current
Channel Load Current
Output Protection
Voltage Sequencing
Section 2. Programmable Option Select
System Board POS Register 2 (Hex 0102)
Description
POS Address Map
Card Selected Feedback
System Board Setup
System Board Enable/Setup Register (Hex 0094)
System Board POS Register 2 (Hex 0102)
Parallel Portselect Bits
System Board POS Register 3 (Hex 0103)
System Board POS Register (Hex 0103)
System Board
Arbitration Bus Priority Assignments
System Memory Map
RT/CMOS Address Register and NMI Mask (Hex 0070)
RT/CMOS Data Register (Hex 0071)
Real-Time Clock Bytes
System Control Port a (Hex 0092)
Micro Channel Implementation
Exception Reporting
Adapter Identification
Central Arbiter
Arbitration Register, Read Hex0090
Read-Only Memory Subsystem
Random Access Memory Subsystem
Presence Detect Encoding
Status Registerc
Status Registera
Ram
Diagnostic Status Byte
Diskette Drive Type Byte
Diskette Drive Type Byte (Bits3-0)
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