CHAPTER
1
INTRODUCTION
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The PCCOM
V2.0 is a high performance, easy to use RS232/RS422 device driver for
PC/XT, PC/AT, PC/386, PC/486 or compatibles. Under MS/DOS environment,
you can set up your serial ports by PCCOM device driver, and these
serial ports can be treated as COM1: and COM2: devices. The setup
procedure provides flexible functions to specify the configuration of
multi-serial card, that is, the hardware configurations of I/O
port number, I/O port address, interrupt and interrupt vector are user
selectable.
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After the
device driver is installed, It takes over communication between CPU and
multi-serial cards such as four port card, eight port card, ... etc.
For each I/O port, the service routine handles a ring buffer to keep
track of all I/O data. Moreover, the PCCOM provides library routines
(C, PASCAL, BASIC, FoxPro) and DOS communication interface (DOS device
driver, BIOS call) for several access levels.
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The PCCOM
V2.0 is an upgrade version of PCCOM V1.0 software, it combines with
PCCOM V1.0 and SERIAL DRIVER utilities. Therefore, PCCOM V2.0 device
driver supports up to 64 ports and each serial port may be either 8250,
16450, or 16550 (FIFO) chip.
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The
features of PCCOM are:
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Support RS232/RS422 device
driver under MS/DOS.
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I/O
port number, I/O port address, interrupt, interrupt vector, and ring
buffer size selectable.
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Communication parameters
(baud rate, parity, ... etc. ) selectable.
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Device
name is specified by the user and it can be treated as a file to
perform I/O operations.
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The device driver start up
by directives of CONFIG.SYS file.
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Up to
64 ports can be driven and each serial port may be either 8250, 16450,
or 16550 (FIFO) chip which are detected by PCCOM automatically.
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Support
C, PASCAL, BASIC, FoxPro language library routines to link user's
program.
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Support
RS232/RS422 diagnostic programs, file transfer, and virtual terminal
evaluator software.
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Virtual terminal evaluator
provides graphics capability.
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Comparisons
between PCCOM V2.0 and PCCOM V1.0 plus SERIAL DRIVER:
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Upgrade
version of PCCOM V1.0 and combines with PCCOM V1.0 plus SERIAL DRIVER.
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New
installation procedure. (need not make serial driver).
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Provides DOS device driver
features which are COM1: and COM2: like.
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Supports
8250, 16450, and 16550 drivers.
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More than 8 ports use
common IRQ (up to 24 ports).
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More
than 8 ports in one device driver (up to 64 ports).
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More
than 8K bytes ring buffer is used in one port (up to 32K bytes).
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Support
ISA bus communication interface (it means IRQ select can be 2, 3, 4,
5, 6, 7, 10, 11, 12, 14, 15).
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Provides both BIOS call
and DOS device driver interface.
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Provides C, PASCAL, BASIC,
FOXPRO libraries.
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