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AST RESEARCH TECHNICAL BULLETIN TB-0015A 9-19-84
INCOMPATIBILITY OF COLUMBIA'S PARALLEL PORT
Due to compatibility inquiries, tests have been conducted on
Columbia's (DESKTOP PC model 1600) parallel port.
The results of these tests show that Columbia parallel port is
not directly compatible with IBM hardware standard or AST
SuperSpool.
Listed below are three major considerations to be aware of when
configuring this system with an AST product.
1. Parallel port on Columbia does a self increment. When
an AST product with a parallel port is installed and
addressed as LPT1, the Columbia parallel port
increments to LPT2.
2. SuperSpool will not function properly when output is
directed to Columbia's parallel port. This is true
whether the port is addressed as LPT1 or LPT2.
3. Located on the Columbia's motherboard is the cable
connector for a parallel port. This connection is not
IBM plug compatible. It is a 37 position connector,
whereas the IBM and AST parallel port connectors are 25
position.
To optimize usage of an AST product in this PC; 1) address AST
board as LPT1, thereby allowing usage of SuperSpool, 2) procure
an IBM compatible cable or modify existing cable to conform with
IBM standards, 3) if Columbia's parallel port is to be used, do
not direct SuperSpool to this point.
Note: All testing and considerations are based on PC-DOS.