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Page B-37APPENDIX 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)
Format: 2B D4 nn 76
Printers: 3812, 5219
Action: This command ends the character overstrike mode
enabled by Begin Overstrike (BOS).
IBMEMUL: Same as IBM.
275EMUL: No operation.