IBM PC - Hardware - Adapters - 1502074

Asynchronous Communications Adapter (1502074)

Item number:          1502074

Announcement date:    1981-08-12
Availability date:    1981-08-12
Announcement letter:  281-65  THE IBM PERSONAL COMPUTER


From the announcement:

       The Asynchronous Communications Adapter provides the IBM
Personal Computer user with a channel to data processing or
input/output devices outside of the immediate system. These can be
connected by telephone using a plug-in modem, or directly by cable
when the device is nearby. The communication "target" may be a large
host computer, a Series/1, another IBM Personal Computer, a paper
tape reader, a communicating typewriter, a laboratory instrument, or
other machines providing the popular RS-232-C asynchronous interface.
       The Asynchronous Communications Adapter is flexible enough to
match most of the computers and related products available in the
microcomputer marketplace. The user's program selects the appropriate
speed (50-9600 bps), format (5, 6, 7 or 8-bit characters), parity and
stop bits to reflect the attached device. Once communication has been
established, the user's program performs reads and writes. Interrupts
permit the program to perform data processing such as calculating,
diskette reading or writing, or printing, and then pause to resume
communications when a signal appears on the line.
       The Asynchronous Communications Adapter has been verified to
communicate with an IBM Series/1 with feature #1610, 2091/2092
attachment card using a sample program provided on the IBM Personal
Computer DOS Diskette, and an application program running on Realtime
Programming System Version 5 (5719-PC5) and Event Driven Executive
Version 3 (5719-XS3).
       The Asynchronous Communications Adapter provides an EIA
RS-232-C interface. One 25 pin "D" shell, male type connector is
provided to attach various peripheral devices. In addition, a
current-loop interface is located in the same connector. A jumper
block is provided to select manually either the voltage or the
current loop interface.
       BASIC language application programs supporting communications
will require a diskette-based, minimum 32KB system containing DOS and
the BASIC language extensions which include communications support.


Page created: 2021-08-12   Page last updated: 2023-10-02