sun@venus.ycc.yale.edu (03/05/89)
Greetings,
I recently purchased a PC Convertable with a internal modem and a
serial/parallel adaptor. The documents that came with it do not contain
enough information about the port adaptor. In the "IBM PC Convertable Guide
to Operation", all it says about serial/parallel adaptor is the following:
"The serial adaptor is packaged with the parallel adapter. Although the
adaptors share a common system interface, the functions of these
adaptors are logically separate.
"The serial, or asynchronous communications, adaptor provides an RS-232C
interface that is compatible with most applications written for the IBM
Personal Computer Asynchronous Communication Adaptor.
"The parallel adapter is specifically designed to attach printers with a
parallel port interface. It can also be used as general purpose input/
output port for any device or application that matches its input/output
capabilities. A 25-pin D-shell connector provides the means to attach
devices." ^^^^^^^^^^^^^^^^^^^^^^^^
That's all the description about the adaptors. On the adaptor unit, there
are two 25-pin D-shell connectors, one is male on the left, the other is
female on the right. Which one is the serial port and which one is the
parallel one? Or they are the same port? If both ports share the same
25-pin connector, then what is the pin assignments?
There is another slot at the back, which is I suppose is for adding more
units.
I also have an internal modem inside the Convertable. Does it use up a
serial port? I seem to remember a normal PC has two (serial) ports for
communication, com1 and com2. Is the serial port provided by the serial/
parallel port adaptor com1 or com2?
I appreciate it if you can answer these questions. Please send mail to
sun@venus.ycc.yale.edu or sun@yalevms.bitnet
Thank you
--- Kang Sun