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Modes 1-6 & 8.
_______
Mode 1.
Function: An IEEE to RS232 bi-directional and an IEEE
from Centronics input interface.
Also Listen Only IEEE to RS232 interface.
Switchable CBM Pet to PC Ascii conversion.
Use:
PSI makes RS232 and parallel equipment function
as devices attached to IEEE controller.
Example: HP or CBM PET IEEE computer to RS232 laser
printer or modem.
IBM PC parallel port data to IEEE computer.
Summary.
_________
The PSI BOX acts as an IEEE bus device taking its
instructions from an IEEE controller such as a Hewlett-Packard
9825 or Commodore Pet computer, an RS232 device is
connected to the PSI RS232 port or the output from the parallel
printer port of a PC is connected to the parallel input port of the
PSI BOX. The PSI BOX acts like two separate IEEE devices,
one device is an IEEE to RS232 interface the other device is an
IEEE from parallel interface.
____________________
Listen Only Operation.
The PSI BOX can also be set to act as a Listen Only
IEEE to RS232 output interface. To select the Listen Only
configuration set the Mode switches to Mode 1 and set the IEEE
address dip switches all upward, ie address 15. Instead of the
PSI BOX becoming IEEE device 15 it will be in Listen Only
mode. Here the a controller instructs one device to talk and
none, one or more devices to listen, the PSI BOX will listen in
to all the data transmitted on the bus irrespective of the IEEE
device that is addressed to listen, and send it to the RS232 port.
In addition, the PSI BOX will happily listen to a Talk
Only device, in a system without a controller, that does not
provide any addressing information.
Chapter 6
PSI BOX Reference
Page 51
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