Modes 1-6 & 8.
PSI BOX Reference
Addressed Operation.
___________________
The PSI BOX acts as the IEEE controller and is the source
of all IEEE commands. It controls the flow of data on the IEEE
bus by addressing and un-addressing devices. Only one IEEE
device can be accessed when in this mode.
The address of the IEEE device that the PSI BOX accesses
is as set on the IEEE address DIP switches. The PSI BOX sends
a LISTEN command to the IEEE bus before each data byte is
sent.
If the RS232 input buffer of the PSI BOX becomes full
then it will signal unable to receive more RS232 data until the
IEEE device accepts data from the PSI BOX.
In Mode 6 the whole of the PSI BOX ram acts as the
RS232 input buffer.
Chapter 6
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