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Modes 1-6 & 8.
THE PSI BOX
MODE 1-6 & 8
Introduction.
___________ _
This chapter explains, in detail, the 8 PSI BOX operating
modes, the DIP switch settings used to select each mode, the
exact nature of the data transfer and applications of each mode.
_________________ _
The Mode Switches.
The mode switches determine the type of data conversion
the PSI BOX is to perform and specify which port is supplying
data and which is accepting data. DIPs 5, 6, 7 & 8 on switch
block 1 are the mode control switches.
The IEEE Controller switch, DIP 5, and the Centronics
O/P switch, DIP 6, are mode switches which have a dedicated
role. DIP switches 7 & 8 on switch block 1 have no dedicated
function but are used in conjunction with the DIPs 5 & 6 to
define the mode of operation of the PSI BOX.
With the exception of the Pet to Ascii character
conversion, the DIP switches are only read when the PSI BOX
is powered up. Changing the DIP switch setting whilst the PSI
BOX is running will have no effect. If you wish to change the
mode of operation of the PSI BOX you must power it off, reset
the switches and power it on again.
In Mode 1 and 2 Commodore Pet to Ascii conversion is
selected by the state of Mode DIP 8 at the time the data is
received. In this way the Pet to Ascii conversion can be changed
on the fly, without the necessity of powering the PSI BOX off
and on.
Chapter 6
CHAPTER 6
PSI BOX Reference
Page 49
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