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RE: COMP: DesignJet 600 Plotter on a COM port

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Assuming your HP can receive data at higher than 9600 bps.  The simplest
answer might be getting a new I/O card.  The following is an explanation
about I/O speed at COM ports.  Though I got it from an ISP web site
explaining about modem problems.  I think it applies here.  

Kehshin Chi

Make sure you have a current UART chip.

 A UART chip is the serial port that your external modem is
 connected to. Older technology UART chips cause many
 connection and throughput problems. A 8250 UART chip is old
 technology that does not support speeds higher than 9600
 bps, while a 16550 UART chip should not cause any
 problems. To find out what type of chip you have, exit your
 operating system and type MSD at a DOS prompt. Run this in
 a DOS session and not a DOS window to get correct
 information. Choose the option for COM Ports and read the
 UART chip type at the bottom of the window. You may try
 lowering your baud rate to connect if you have an 8250 UART,
 but the connection will be unreliable. This is a hardware item
 and must be upgraded through a computer store.

> > -----Original Message-----
> > From:	Bill Allen, S.E. [SMTP:Bill(--nospam--at)]
> > Sent:	Friday, October 02, 1998 1:57 PM
> > To:	seaint(--nospam--at)
> > Subject:	COMP: DesignJet 600 Plotter on a COM port
> >
> > With my new computer, I have fewer resources available than my old
> > P150 dog,
> > particularly IRQs. To help solve this problem, I am trying to set up
> > my
> > plotter on the existing (but free) COM1 port. This was a little
> > hassle, but
> > once I ordered the special HP cable, it works at 9,600 baud. I know
> > new 350
> > Mhz P2 computers and cable modems have made me less patient, but it
> > takes
> > about three times longer (3-1/2 minutes vs. 1 min. 20 secs. on one of
> > my
> > detail sheets) to get the computer back while the computer is
> > rastorizing
> > the .dwg file. I have tried 19,200 baud but I get parity errors (yes,
> > I
> > changed the setting in the device manager) and HP tech support warned
> > me
> > that I may get errors at speeds in excess of 9,600 baud.
> >
> > Any suggestions?
> >
> > TIA,
> > Bill Allen