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Field Engineering

Maintenance Diagrams




Processing Unit

System/360 Model 20
(Machines with serial no. 50,000 and above) Volume 2




SY33-1042-1
Preface




This publication (Volume 2) and its companion publication (Volume 1, 5. 2560 Multi-Function Card Machine Attachment Feature, 2501 Card
Form Y33-1024) constitute the Field Engineering Maintenance Diagrams Reader Attachment Feature, 1442 Card Punch ModelS Attachment
manual for the IBM 2020 Processing Unit (machines with serial number Feature, System/360 Model 20 (Machines with serial no. 50,000 and
50,000 and above) in the IBM System/360 Model 20. Volume 2 contains above), Form Y33-1033.
operations information (Section 5) and Volume 1 contains information on 6. Binary Synchronous Communications Adapter, System/360 Model 20
the following: (Machines with serial no. 50,000 and above), Form Y33-1039.
Diagnostic techniques (Section 1) 7. Input/Output Channel Feature, System/360 Model 20 (Machines with
Error conditions (Section 2) serial no. 50,000 and above), Form Y33-1017.
Data flow (Section 3) 8. Storage Control Feature, System/360 Model 20 (Machines with serial
Functional units (Section 4) no. 50,000 and above), Form Y33-1037.
Power (Section 6) Information on the serial I/O channel feature is contained in Field
Microprograms (Appendix B) Engineering Theory of Operation, Maintenance Diagrams, Serial 1/0
Both volumes are used for maintenance, instruction, and recall. Channel A ttachment Feature, System/360 Model 20 (Machines with serial
The material in these volumes supplements the information contained no. 50,000 and above), Form Y33-1040.
in the following manuals: The associated Field Engineering Theory of Operations manual for the
1. Field Engineering Theory of Operation, 2020 Processing Unit, features are:
System/360Model20 (Machines with serial no. 50,000 and above), 1. 1403 Printer Models 2, 7, Nl Attachment Feature, System/360 Model
Form Y33-1021. 20 (Machines with serial no. 50,000 and above), Form Y33-1020.
2. Field Engineering Maintenance Manual, 2020 Processing Unit, 2. 2152 Printer-Keyboard Attachment Feature, System/360 Model 20
System/360 Model 20 (Machines with serial no. 50,000 and above), (Machines with serial no. 50,000 and above), Form Y33-1025.
Form Y33-1035. 3. 2203 Printer Attachment Feature, System/360 Model 20 (Machines
with serial no. 50,000 and above), Form Y33-1027.
Associated Publications 4. 2520 Card Read Punch A ttachment Feature, System/360 Model 20
The follOWing Field Er