Modes 1-6 & 8.
PSI BOX Reference
addressed to TALK any response is sent back to the host
computer via the RS232 port. At the end of the plotters output
the plotter is commanded to UNTALK. At every 3 second
interval the plotter will be repolled for further responses.
If the PSI BOX receives a Flow Control command then it
immediately responds to it in the appropriate way.
If the RS232 input buffer of the PSI BOX becomes full
then it will signal that it is unable to receive more RS232 data
until the IEEE device accepts data from the PSI BOX.
In Mode 8 the 28,672 bytes of the PSI BOX ram acts as
the RS232 input buffer with 2048 bytes for the RS232 output
buffer.
Chapter 6
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