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Message   Visitor    CAPTAIN FANTASTIC   DOS Port Buffer   October 23, 1995
 12:17 PM *  

 CF#@> Re: DOS Port Buffer

 > I've a problem I am having a tussle to solve. If I 'COPY' something to
 > the COM Port, it only accepts documents (to a Serial Printer) up to about
 > 6k in size, then it halts. The Cutoff size is not effected by the environment
 > I have set, nor does it seem to make a diff if I add a print spooler to the
 > mix. It seems to be totally inherent to DOS.. ANY ideas?

 CF#@> Hmm...  Just a guess here, but I would suspect that there is little or
 CF#@> no supervision over the serial port with just a 'COPY'.  You are more
 CF#@> than likely overflowing the serial buffer.  Cant think of a good
 CF#@> solution to this.

I've used a serial port printer, so I am familiar with the problem.

From MODE v5 help:

Configures system devices.
Serial port:       MODE COMm[:] [BAUD=b] [PARITY=p] [DATA=d] [STOP=s] [RETRY=r]

I'm not sure what 'RETRY' should be with v5. For v3.3 it was 'P' (for printer)
For example: MODE COM1: 9600 N 8 1 P

The P switch keeps the serial port from timing out while the printer
buffer is full.
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