IBM 2025 Maintenance Manual page 4

1.18.2.6 CHNL (Channel)
1.18. 2. 7 File.
1.18.3 CPU Checks
1.18.3.1 Control Word.
1.18.3.2 Storage Data
1.18.3.3 CSL Check
1.18.4 Operator's Control Panel (OCP) Indicators
1.18.4.1 Power On Key
1.18.4. 2 Pluggable Indicators .
1.18.5 Keys
1.18.5.1 Control Storage Load
1.18.5.2 PSW Restart
1.18.5.3 Control Address Set .
1.18.5.4 Enable Control Storage Store
1.18.5.5 Printer-Keyboard Alter/Display
1.18.6 Mode Switch .
1.18.6.1 Main Storage Address Stop
1.18. 7 Diagnostic Control Switch
1.18.7.1 Stop
1.18.7.2 Trap
1.18. 7. 3 Scan Storage
1.18. 7.4 Single Address MS
1.18.7.5 Single Address AS
1.18. 7 .6 Test Pattern
1.18. 7. 7 Load Program Storage
1.18.7.8 Load Storage .
1.19 Maintenance Programs
1.19.1 Machine Level Control (MLC) and
Engineering Changes (EC's) .
1.19 .1.1 Field Microprogram Changes
1.19. 2 Field Change Exceptions
1.19.3 Unique Considerations
1.20 Multisystem Configuration
1.21 1401/1460 and 1440 Compatibility Features.
1.22 Model 20 Mode Feature .
1.22.1 Machine-Check Trap and 1052 Logout
1.22.2 Diagnose Instruction.
1.22.3 CE Trap
1.22.4 CE Test Panel Hubs .
1.22.5 CE Display Cable.
1.22.6 Programming Errors .
1. 22. 7 Local Storage Zone and External Mode
for 2560
1.23 CE Panel
1. 23.1 Stop Position .
1.23.2 Trap Position .
1.24 Power and Cooling
1. 24.1 Failure Detection, Indication, and Isolation
1.24.2 Cooling Facilities.
1.24.3 Warm-Up
1.24.4 Convenience Outlets .
1.25 Main Storage Diagnostic Aids
1.25.1 X and Y Decode Numbering Scheme
1.25.2 Scoping Storage
1.25.2.1 Scoping
X
and
Y
Source-Terminating
Resistors .
1.25.2.2 Scoping Inhibit Drive Terminating
Resistors .
1.25.2.3 Array Sense Line Checking .
1.25.2.4 Array
X
and
Y
Drive Line Checking
1.26 Local Storage Diagnostic Aids
Chapter 2. Console and Maintenance Features.
SECTION 1. BASIC UNIT
2.1 Storage Protect Key--Display .
2. 2 Patch Card Generation
2.3 DEBE-2 .
2.4 1/0 Exerciser Routine With Variable Delay .
2.5 Console Inquiry Program .
2.6 1401 Emulator CSL Deck.
2. 7 1403 Buffer Load Microloop .
2.8 · Soft-Stop Loop--Single Cycling
2.10 Worst-Case Storage Scan Definition
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2.11 MS Address Stop Procedure During IPL or CSL
2.12 PSW
2.12.1 PSW Restart
2.12.1.1 Procedure .
2.12.2 Display of Current PSW.
2.13 Control Storage Load Failure Detection
2.13.1 Description
2.13.2 Procedure .
2.13.3 Reader Checks During CSL
2.14 Checksum Routine--BCHK
2.15 Initializing Procedure--Checksum
2.16 System Configuration--CSL .
2.17 BCPL Routine.
2.17 .1 Procedure for Punching CSL Cards
2.17 .2 Restrictions When Punching CSL Cards
2.17.3 Example of Punching and Loading a Replace
Card
2.18 Metering Switch (CE Switch)
2.19 Display Operations
2.19.1 Program Storage Display
2.19.2 Control-Storage Display .
2.19.3 Auxiliary-Storage Display
2. 20 Store Operations .
2.20.1 Program-Storage Store
2.20.2 Control-Storage Store
2.20.3 Auxiliary-Storage Store .
SECTION lA. PR-KB PROCEDURES
2.21 Addressing, Console Printer-Keyboard .
2.22 Program-Controlled Operations .
2.22.1 Channel Commands .
2.23 Console Printer Manual Alter/Display
2.23.1 Setup
2.23.2 Addressing
2.23.2.1 Execution of Alter or Display
2.23.2.2 End Operation
2.24 Message Formats .
2.24.1 Alter Storage .
2.24.2 Display Storage
2.25 Errors
2.26· Logout .
2.27 Suggested Restart Procedures for Integrated PR-KB
2.27.1 Command Reject (Sense Bit 0).
2.27 .2 Intervention Required (Sense Bit 1)
2.27.3 Bus-Out Check (Sense Bit 2)
2.27.4 Equipment Check (Sense Bit 3)
2.27.5 Sense Bits 4, 5, 6, and 7 .
2.28 External to CPU Facilities (1052)
2.28.1 TI (1052 Data In)
2.28.2 TR (1052 Tilt/Rotate Register)
2.28.3 TD (1052 Diagnostic Branch Conditions) .
2.28.4 TT (1052 Branch Conditions)
2.28.5 TU (1052 Diagnostic Branch Conditions).
2.29 CPU to External Facilities (1052).
2.29.1 TA .
2.29.2 TE (1052 Data Out) .
SECTION lB. 1403 PROCEDURES .
2.30 Addressing, 1403 Printer Attachment
2.31 Commands, 1403 Printer Attachment .
2.32 Checks (1403).
2.32.1 PLB Parity Check
2.32.2 Hammer Check
2.32.3 Coil-Protect Check
2.32.3.1 Hammer Driver Coil--Fuses
2.32.4 Sync Check
2.32.5 Additional Checks
2.32.5.1 Forms Check .
2.32.5.2 End Of Forms
2.33 Suggested Restart Procedures For 1403
2.33.1 Command Reject (Sense Bit 0) .
2.33.2 Intervention Required (Sense Bit 1)
2.33.3 Bus-Out Check (Sense Bit 2)
2.33.4 Equipment Check (Sense Bit 3)
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