IBM Personal System/2 50 Manuals

Manuals and User Guides for IBM Personal System/2 50. We have 1 IBM Personal System/2 50 manual available for free PDF download: Technical Reference

IBM Personal System/2 50 Technical Reference

IBM Personal System/2 50 Technical Reference (62 pages)

Brand: IBM | Category: Desktop | Size: 1.79 MB

Table of Contents

Table of Contents
5
Section 1. System Overview
9
Description
11
System Board Features
11
1-1. Model and Submodel Bytes
11
1-2. System Board Devices and Features
12
System Board Block Diagram
13
System Board I/O Address Map
14
Specifications
15
1-5. Performance Specifications - Type 1 System Board
15
1-6. Performance Specifications - Type 2 System Board
16
1-7. Physical Specifications
17
Programmable Option Select
21
Description
21
Section 2. Programmable Option Select
21
POS Address Map
23
Card Selected Feedback
24
System Board Setup
24
Card Selected Feedback Register (Hex 0091)
24
System Board Enable/Setup Register (Hex 0094)
25
System Board POS Register 2 (Hex 0102)
26
2-4. System Board
26
2-5. Parallel Port Select Bits
26
P~S Register 2 (Hex 0102)
26
System Board POS Register 3 (Hex 0103)
27
System Board POS Register (Hex 0103)
27
Adapter Enable/Setup Register (Hex 0096)
28
System Board
29
Description
31
Micro Channel
31
Adapter Identification
31
Central Arbiter
31
Arbitration Bus Priority Assignments
32
Arbitration Register, Write to Hex 0090
33
Arbitration Register, Read Hex 0090
33
Central Arbiter Programming
33
Memory
35
Read-Only Memory Subsystem
35
Random Access Memory Subsystem
35
System Memory Map
36
System Memory Maps
36
System Board Memory Connector, Type
37
System Board Memory Connector
37
System Board Memory Connector, Type
38
3-7. Presence Detect Encoding
39
Real-Time Clock/Complementary Metal-Oxide Semiconductor RAM
40
RT/CMOS RAM Address Map
40
RT/CMOS Address Register and NMI Mask (Hex 0070)
41
RT/CMOS Data Register (Hex 0071)
41
RT/CMOS RAM I/O Operations
42
3-11. Real-Time Clock Bytes
43
Status Register a
44
Status Register B
44
Status Register C
46
Status Register D
46
Diagnostic Status Byte
47
CMOS RAM Configuration
47
Diskette Drive Type Byte
48
Equipment Byte
50
Miscellaneous System Functions
52
Nonmaskable Interrupt
52
System Control Port B (Hex 0061)
52
System Control Port a (Hex 0092)
54
Power-On Password
56
Type 2 Serial Port Controller
57
Hardware Compatibility
57
Index
59

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