IBM 5100 User Manual

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DCP1 DIAGNOSTIC MODE
To enter DCP1 diagnostic mode, first call in the DCP1
program. Entry into diagnostic mode is made through
the keyboard by
pressing and holding the CMD key and
pressing the * (asterisk) or x (multiply) key on the numeric
keyboard. Entering
these keys out of sequence cancels the
requested function.
All address specifications for the various diagnostic
functions are forced
to an even halfword boundary.
Recovery from
an error is accomplished by starting the
routine over again. Recovery from a process check is
accomplished by pressing RESTART. Exit from
DCP1
diagnostic mode by pressing RESTART.
DCP1 Diagnostic Mode Functions
Branch: This function is used in the tape read tests
and, at times, when receiving plant assistance. Branch
exits
DCP1 diagnostic mode to execute code located in
executable ROS or in read/write storage.
When exiting from the diagnostic mode, the keyboard is
activated
to accept the CMD and ATTN combination.
This key combination cancels any operation and returns
control
to DCP1 diagnostic mode (unless the branch
was
to another keyboard control routine). Therefore,
when branching
to tape read or DCP2, any of the
branch operations can be cancelled.
The
BH (branch and halt) halts processing when the halt
address is reached in the instruction address register of
level 0; a shift and ATTN key combination restores the
microinstruction at the halted address and forces level 0
to a halt.
At this time, the 5100 Portable Computer should be
placed in step mode. Pressing ATTN again resumes
processing
in level 0 following completion of the step
mode in level 3. The space bar returns control
to DCP1
diagnostic mode.
Valid Branch Input Keys
BE
BH
BR
Branch to executable ROS address.
Branch to read/write storage address and
halt at the specified address.
Branch to read/write storage address with
no halt.
EXECUTE Execute the preceding branch instruction
and exit from the branch routine but re-
main in DCP1 diagnostic mode.
DCP1 normal mode keys are also valid in DCP1 diagnostic
mode.
Branch Display Formats
Branch in executable
ROS with no halt:
BE ROS@ xxxx
EXEC -
Branch in read/write storage with no halt:
BR MEM@ xxxx
EXEC -
Branch in read/write storage with halt:
BH MEM@ xxxx
HALT@ yyyy
EXEC -
xxxx = Branch address in hex.
yyyy = Halt address in hex.
5100 Diagnostics Overview 3-21

IBM 5100 Specifications

General

Release Year	1975
RAM	16 KB - 64 KB
Storage	204 KB tape drive
Display	5-inch CRT
Operating System	APL/BASIC
Processor	IBM PALM (1.9 MHz)

Summary

Preface

CE Safety Practices

General Considerations

Safety precautions for working with IBM equipment, general guidelines.

Rescue Breathing for Adults

Step-by-step instructions for administering rescue breathing to adults.

Using the IBM 5100 Portable Computer Maintenance Library

5100 Maintenance Library Overview

Description of the 5100 maintenance library components including MAPs, MIMs, logics, catalogs, and tools.

MAPs

MAP Organization

Flowchart and explanation of how MAPs are structured and used for troubleshooting.

Using the MAPs

Instructions on how to read and follow MAPs, including sequences and probing.

MAP Example

Illustration and explanation of a sample MAP process, including entry/exit points and references.

Maintenance Information Manual

Maintenance

Details on location drawings and procedures for repairing or replacing FRUs.

Diagnostic Aids

Information on diagnostic programs, halt codes, and error conditions.

Theory

Descriptions of functional units and features, including a system overview.

Circuits

Information on card plug charts, signal cable charts, and logic diagrams.

Language Support

Reference material for determining causes of programming problems.

Appendix

Installation procedures and additional maintenance information.

Abbreviations and Glossary

Definitions of terms and abbreviations used in the manual and MAPs.

Index

A detailed listing of all topics within the maintenance information manual.