User Selectable DIP Switch Settings for Main CPU Bay
Note that the
•Switch 3 of S1002
This switch setting is ignored if DIP switch 7 (described below) is set to ON. Current systems utilize a “variable speed” keyboard communication protocol. Older systems and keyboards were limited to using “fixed speed” keyboard communication protocols. In addition, there were two types of fixed speed pro- tocols available. By default, newer CPUs are set to operate using “six poll byte” variable speed mode, but if a newer CPU is installed into an older system, the existing keyboards would not operate with this format. This option switch is provided to support backward compatibility with the older style keyboards.
When this switch is set to OFF, the CPU communicates with the system key- boards using a “four poll byte” protocol. When it is ON, the keyboard commu- nication uses an “eight poll byte” protocol.
This option is a global system setting that determines the communication proto- col that will be used for all keyboards connected to the system.
For reference, the following table lists the Allegiant Series keyboard models and the protocol supported by each:
Keyboard model | Supported protocols |
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TC8550KB | 4 poll byte |
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8 poll byte | |
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TC8550 | 4 or 8 poll byte |
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TC8550A, TC8551A, TC8553 | 4, 6, or 8 poll byte |
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TC8554, TC8555 | 4, 6, or 8 poll byte |
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LTC 8553 Series | 4, 6, or 8 poll byte |
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LTC 8555 Series | 4, 6, or 8 poll byte |
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IntuiKey | 6 poll byte |
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•Switch 4 of S1002
This switch allows the printer port on the rear of the main Allegiant bay to be configured as an auxiliary console port when it is turned ON. See the descrip- tion above regarding switch 2 for information on using an auxiliary console port. The printer port has the same
NOTE This feature can also be implemented via the PRT2CON CCL command using an external PC, dumb terminal or other computing device. Refer to the Allegiant Command Console Language (CCL) manual for complete information about using CCL commands.
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