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13.5.3
Printer Driver Flags
CSWTCH:
Value determines which of the printer drivers (Section 13.5.5) is
used to transmit characters to (and possibly from) the printer:
0:
CP/M "List Output" Device driver use only if printer supports
ETX/ ACK protocol
1:
Word Processing Port Driver
2:
User-installed Printer Driver Subroutines - XWS.COM is configured
in this format
3:
OEM Daisy Wheel and Similar Printer Driver
4:
Alternate Console Printer Driver
CSWTCH applies to all printers. CSWTCH is set by INSTALL in accordance
with the choice made at the "Printer Driver" menu.
HA YBSY: This location should be non-zero if the printer driver in use has a
"printer busy test" implemented, or zero if no provision has been installed for
determining when the printer is ready to accept a character. When non-zero,
Word Processing will not output to the printer until the printer is ready, and
Word Processing will check more often whether the printer is ready to accept
a character. When non-zero, Word Processing will not output to the printer
until the printer is ready, and Word Processing will check more often whether
the printer is ready to accept a character. Thus, a correctly installed printer
busy test, plus a non-zero value in HA VBSY, cause the printer to run more
steadily when editing is being performed at the same time as printing, while
improving keyboard response in editing because the printer output routine will
never "hang" while waiting for the printer to be ready to accept a character.
IN ST ALL set HA VBSY non-zero if the port driver is selected, or zero if
another driver is selected. The user should set HA VBSY non-zero after adding
a busy test to the CP/M list device driver or the al terna te console driver, or
after installing custome river subroutines that include a printer busy test.
REFERENCE
13-24
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