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Interfacing Gemini with Your Computer
I
Depending on the type of system you have, DIP switch
number 2-3 is an important DIP switch that affects computer
performance. For example, Apple operates on a 7-bit interface, and
the IBM-PC requires an 8-bit interface.
CONNECTING THE PARALLEL INTERFACE
This section discusses hooking up your computer to Gemini, via
the parallel interface.
A Look at the Parallel Interface Connector
When viewing your Gemini, as shown in Figure 4-3, the parallel
interface connector is just to the left of DIP switch 2. Take a
moment to look closely at the connection. You will see that the
connector is a metal band encasing a plastic spacer, with the
center taking the form of a hollow rectangle. This rectangular
opening is bordered both on the top and bottom with rows of 18
metal strips, called pins, that are set in the blue plastic spacer.
For more information about the pins in Gemini's parallel
interface, turn to Appendix N at the back of this manual.
Each of these 36 pins supports an important function in your
computer/printer interface, so the connecting plug must be
compatible with the Gemini pin configuration.
The Connecting Plug and Cable
Note: The cable length should be as short as is workable to
minimize signal loss.
Star Micronics, Inc. recommends a connecting plug by
AMPHENOL -
product no.
57-30360.
The connecting cable should be a twisted-pair, ribbon-type
cable. Appendices A through F provide information on acceptable
connecting cables, including pin-out charls, in case you want to
make your own connecting cable.
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