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- ID:SP Serial Port Printing in DESQview
- Quarterdeck Technical Note #107
- by Stan Young
- last revision: 12 February 1992
-
- Q: HOW CAN I INITIALIZE MY SERIAL PRINTER WITH DESQVIEW?
-
- A: If you are going to initialize a serial port in a DESQview window, you have
- set up the program information file for that window so that the option "Uses
- serial ports" is either "Y" or the specific port being used. Otherwise the
- COM port cannot be accessed due to the port protection mechanism of DESQview.
- Trying to use the DOS MODE command to initialize a COM port from a window
- which has "Uses serial ports" set to "N" will result in a DOS message:
-
- "Invalid parameter 'COM?'
-
- since DOS will not see the port as available.
-
- Q: IS THERE A "BEST WAY" TO SET UP FOR SERIAL PRINTING IN DESQVIEW?
-
- A: Set up as shown above, a program running in DESQview can directly access a
- serial port for printing. However, a better solution is to initialize the
- port with MODE and redirect an LPT port to the serial port BEFORE running
- DESQview. If you have redirected an LPT port to the serial port before
- running DESQview, you can simply print to the port without regard to how the
- "Uses serial ports" parameter is set, since the actual redirection of print is
- handled outside of DESQview.
-
- Q: I ALSO HAVE A PARALLEL PRINTER. HOW CAN I REDIRECT MY SERIAL PORT TO
- LPT1?
-
- A: Don't select an LPT port which is already in use. If you already have a
- real parallel printer, simply select the next logical LPT port to redirect.
- Remember that a printer port can be addressed as a logical device by DOS --
- that is, you do not have to actually have a port set up as LPT2 in order to
- direct COM1 to it. The logical parallel printer ports supported by DOS are
- LPT1, LPT2 and LPT3.
-
- ************************************************************************
- *This technical note may be copied and distributed freely as long as it*
- *is distributed in its entirety and it is not distributed for profit. *
- * Copyright (C) 1988-92 by Quarterdeck Office Systems *
- ************************ E N D O F F I L E *************************
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