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vector ZCB Single Board computer
Many :Peripherals hold either or both lines 4 and 20 at +12 VDC.
This
allows an alternate method of providing the peripheral with +12 VDC on lines
5, 6, and/or 8.
Simply make the appropriate connection(s) at the back of
the peripheral.
This can be done by soldering jumpers within the DB-25
connector or external to it.
For example, to provide +12 VDC on lines 5 and
6, you can connect pin 4 to 5, and pin 6 to 20.
This eliminates the need
for the extra wires in your external cable, though it is a less elegant
solution.
The following describes the external cabling required by three commonly
used peripherals.
In each case, we are referring to the serial interface
version of the :Peripheral.
In
each case, do not forget to set the serial
port on the ZCB board to the same baud rate that your are setting the
printer.
(1)
Hazeltine 1400 Video Display Terminal or equivalent:
Use a 25-wire ribbon cable.
Alternately, create a 3-wire cable
connecting lines 2, 3, and 7 straight through.
Ignore the instruction in the Hazeltine 1400 Video Display Terminal
Reference Manual (May 1978) in Section 5.5 which direct you to cross lines 2
and 3 if connecting directly to a computer. (That instruction assumes you
are connecting to a canputer channel configured as Data Terminal Equipment.)
Also ignore the ins truction to connect line 1 and ignore the absence of an
instruction to connect line 7.
Other Hazeltine terminals are usually connected in the same way.
(2)
Diablo 1610 or 1620 printers, NEe Spinwriter with Diablo protocol,
QuIne
Sprint 5, or DataProducts letter quality printer with Diablo protocol:
Use a 25-wire ribbon cable.
Alternately, you can create a 6-wire cable connecting lines 2, 3, 5, 6,
7, and 8 straight through.
However, if you are not using the ASCII
acknowledgement signals sent by these printers and you are not using a
keyboard built into the printer, you do not have to connect lines 2 and 5.
Since IIDst Vector Graphic software makes use of the acknowledgement signals
(emulating the Diablo protocol), you should connect these two lines when
using a Vector Graphic computer.
With at least the
QuIne,
you can use a 3-wire cable connecting only lines
2, 3, and 7 if you connect pins 5, 6, and 8 to pin 20 at the back of the
printer.
Note that some models of these printers have female sockets in their
rear, in which case you will have to configure a cable with male connectors
at both ends.
(3)
TI 810 Receive-only Printer
Rev. I-B 6/11/80
2-13
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