I-Data 5250 ALLY User Manual

Page 219

Page B-37

APPENDIX B SCS/DCA COMMAND SUMMARY

Command:

Begin Overstrike (BOS)

Format:

2B D4 nn 72 ch bp gcgc cpcp

Printers:

3812, 5219

Action:

Starts character overstrike mode. After a Begin

Overstrike command is received, all characters printed

(except bypassed characters), are overstruck until an End

Overstrike command is received.
The ch parameter is the character to use for overstriking.
The bp parameter specifies the set of characters for

which to bypass overstriking. Valid values are 00h

(bypass horizontal Tab and indent Tab commands), 01h

(continuous underscore) and 80h (bypass Space,

horizontal Tab, indent Tab and relative horizontal print

position commands).
The gcgc and cpcp parameters are not used or inspected

by the 3812 or 5219, but both gcgc and cpcp should be

zero (0000h).
Overstrike mode, once activated with the Begin

Overstrike command, is deactivated by either the End

Overstrike or Set Initial Conditions commands.

IBMEMUL:

Same as IBM.

275EMUL:

No operation.

Command:

End Overstrike (EOS)