IBM 2250 3 Manual page 63

Absolute graphic orders 20
Addressing of the 2840 and a 2250 31
Alphameric keyboard:
Functional description 12
Functions of keys 13
General description 6, 8
Operations with the buffer 21
Asynchronous status 32
Audible alarm 8
Automatic line spacing 12
Basic-size characters 11, 12, 13
Blanking bit:
Function 10
Usage in Graphic mode data 20
Buffer program:
Examples 39
General description 17
2250 and 2840 operations during display regeneration 25
Buffer size 6
Buffer subroutines 43
Channel command word 31
Character area 12
Character deflection system 10
Character display characteristics 11
Character generator operations 21
Character mode:
Electron beam positioning 10, 13
Orders, functional description 20
Timing 26
2840 and 2250 operations 20
2840 data flow description 25
Character set and code assignments 11
Character spacing 11, 13
Command chaining 31
Command names and codes 33
Commands:
Functional description 32
Insert Cursor 37
No Operation 36
Read Buffer 34
Read Cursor 36
Read Manual Inputs 34
Read Output Registers 33
Read XY Position Registers 36
Remove cursor 38
Sense 38
Set Audible Alarm 37
Set Buffer Address Register and Start 37
Set Buffer Address Register and Stop 37
Set Programmed Function Indicators 37
Storing a buffer program 33
Write buffer 33
Control commands 36
Control mode orders 21
Controls and indicators, operator:
Metering 54
On 2840 53
On 2250 53
Cursor:
Command operations with 36, 38
Functional description 15
Operations in the buffer 21
Data chaining 31
Defer Response to Light Pen Detects order 23
Device status byte:
Asynchronous status 32
Bit assignments 32
Ending status 31
Functional description 31
Initial status 31
Disable Light-Pen Detects order 24
Display area coordinate addressing system 8, 9
Display areas size 7
Display copier attachment feature
Display multiplexer feature 6
Display regeneration:
General information 7
Initiation of 33, 3 7
6
Operation during 2840/ channel interface activity 32
Start Regeneration Timer order control 25
Termination 26
Timing 26
2250 and 2840 operations with buffer program 25
Electron beam blanking and unblanking 9
Electron beam positioning 9
Enable No Switch Detects Operation order 24
Enable Switch Detect Operation order 23
Ending status 31
End Order Sequence order 22
Enter Character Mode orders 20
Enter 4-Byte No-Op order 21
Enter Graphic Mode orders 17
Enter-2-Byte No-Op order 21
Entities 42, 44
Examples of 2840/2250 operations:
Alphameric keyboard 42
Buffer program 41
Display an image on one 2250 39
Normal light pen detect 41
Purpose of examples 39
Glossary 64
Graphic design operations:
Buffer subroutines 43
Entitles 42, 44
INDEX
Index 65