IBM 5110 User Manual page 5

CHAPTER 9. PRINTER CONTROL ............. 95
Formatting Output . . . . . . . . . . . . . . . . . . . . . . . . . 96
Formatting Reports . . . . . . . . . . . . . . . . . . . . . . . . . 98
Useful APL Statements and User-Defined Functions
for Formatting Reports . . . . . . . . . . . . . . . . . . . . . 102
CHAPTER 10. INPUT/OUTPUT CONTROL ....•.. 107
Sequential and Direct Access Data Files . . . . . . . . . . . 108
Logical and Physical Records . . . . . . . . . . . . . . . . . . 108
Types of Data File Formats . . . . . . . . . . . . . . . . . . . 109
For Sequential Access Data Files . . . . . . . . . . . . . 109
For Direct Access Data Files . . . . . . . . . . . . . . . . 110
The 5110 I/O Processor and Shared Variables . . . . . . . 116
Establishing an APL Shared Variable . . . . . . . . . . . . . 117
Using APL Shared Variables . . . . . . . . . . . . . . . . . . 118
To Create a New Sequential Access or Direct
Access Data File . . . . . . . . . . . . . . . . . . . . . . . 119
To Add Data to an Existing Data File . . . . . . . . . . 121
To Read a Sequential Access Data File . . . . . . . . . 122
To Update Data in a Direct Access Data File . . . . . . 124
To Search by Key a Direct Access Data File . . . . . . 131
To Read-Only Data from a Direct Access
Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
To Read Data from and Write Data to the
Display Screen . . . . . . . . . . . . . . . . . . . . . . . . 133
To Send Data to the Printer . . . . . . . . . . . . . . . . . 137
Terminating the Operation and Retracting the
Shared Variable Offer . . . . . . . . . . . . . . . . . . . . . . 138
Sample Input/Output Operations . . . . . . . . . . . . . . . 140
Using the )RESUME Command . . . . . . . . . . . . . . . . 146
More about Records and Files . . . . . . . . . . . . . . . . . 146
Organizing a Diskette File . . . . . . . . . . . . . . . . . . 148
Ordered and Unordered Records . . . . . . . . . . . . . 160
Maintaining Diskette Files . . . . . . . . . . . . . . . . . . 160
Designing a Record . . . . . . . . . . . . . " ... : .... 161
Documenting Record Layout . . . . . . . . . . . . . . . . 163
Determining the Number of Records in a File ..... 163
CHAPTER 11. DEBUGGING AND ERROR
RECOVERY TECHNIQUES .•............... 165
Suspended Function Execution . . . . . . . . . . . . . . . . 166
State Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
APPENDIX A. 5110 COMPATIBILITY WITH
OTHER APL SYSTEMS . . . . . . . . . . . . . . . . . . . . 159
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • 161
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