On 12 Jan 2002 at 9:36, Jude DaShiell wrote:
>I don't know if another uart chip is needed. Haven't ever opened up the
>machine. The serial port is a male since it has pins in it like the 9 pin
>port has. Does this make any sense? I removed the cable from the port and
>counted the pins and to the best I can determine, it has 15 pins.
Dear Jude,
It does sound like this is a serial port. Traditionally, male 25 or 9
pin connectors on the PC are serial ports, and female 25 pin connectors
are parallel ports.
It would not be unusual, in my opinion, to find a 9-pin to 25-pin cable
which has just 15 contacts on the 25-pin end. The 9-pin standard
usually ties a number of the pins which you would see in the 25-pin
cable together, so I would expect that some of them are electrically
equal.
I would guess that you have the hardware that you need for a serial
connection. You'll want to look inside the case, and verify that what
you believe to be a second serial port actually is, and to see if you
can determine what it's settings are. If there are jumper settings on
the serial-port card, examine them closely to determine which interrupt
(3 or 4) and I/O address that they are set for.
Also look at the boot screens when your computer starts up. Most
computers of that vintage will display, sometime after the memory
count, the processor, speed, memory, hard drives, and any ports that
they have detected. Look for the serial port part of the report, and
try to be sure that you're seeing more than one. They will probably by
listed by I/O address, so you'll likely see something like:
Serial ports: 3F8 2F8
3F8 is COM1, 2F8 is COM2, 3E8 is COM3, 2E8 is COM4
Once you've determined what I/O address the serial port thinks it's
using, then you can start trying to configure the bit rate [baud],
parity, and stop bits, to talk to your equipment. (I appear to have
forgotten what you had written that you were trying to interface to.)
Hope this helps,
Anthony J. Albert
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Anthony J. Albert [EMAIL PROTECTED]
Systems and Software Support Specialist Postmaster
Computer Services - University of Maine, Presque Isle
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