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- ID:SP Serial Port Printing in DESQview
- Quarterdeck Technical Note
- by Stan Young
-
- If you are going to initialize a serial port in a DESQview
- window, you will have set up the program information 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 intialize a COM port from a window which is "Swappable"
- will result in a DOS message: "Invalid parameter 'COM?' since DOS
- will not see the port as available.
-
- Set up in this fashion, 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. When 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.
-
- 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 it
- to COM1. The logical parallel printer ports supported by DOS are
- LPT1, LPT2 and LPT3.
-
- Copyright (C) 1990 by Quarterdeck Office Systems
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