Radio Shack TRS-80 DT-1 User Manual

Dr-1
----------- TRS-aO ®
Owner's Manual
As soon as you press <CI'RL> <SHIFT> <ENTER>, the tœnu
will disawear, the buzzer will sound, and the Cursor
will return to the HOIre position.
Printer Operation
The Dr-l has two pr inter interfaces -- one interface is for
serial printers, the other is for Parallel printers.
You can have bath a serial and a parallel printer connected
to the DI'-L If two printers are connected to the Terminal,
bath lIDSt be configured to print, or the non-printing unit
rrust be de-selected in such a rranner that a BUSY signal is
not generated by this Printer.
Ta connect a Printer to the Dr-l, see Setting Up the DI'-l
earlier in this rranual.
To use a Printer once it is connected to the or-l, follCYW'
the instructions for the terminal you are emulating (see
19;)endi.x 0).
Technical Inforuation
Data fran the DI'-l is handled by the printers in different
forms but in like rranner. For exemple, the serial printer
rrust be set up to accept data at the sam: baud rate that the
Terminal is using. The Parallel printer will be accepting
data on an "as available" basis when a word has been
assembled from the serial forrrat.
Beth printers use BUSY hand-shaking. That is, if one of the
printers is busy, bath printers are busy.
When the DI'-l recei ves a BUSY status fran ei ther of the
Printers, the terminal will transmit a CONffiOL S (XOFF) to
the Host System in an attempt to stcp further data fran
being recei ved. If the Host system does not stcp sending
data, the Printer rray lose characters. The Dr-l does not
buffer characters for the Printer.
There are SOIœ Host Systems that use CONIROL S as a terminating
character sorrewhat like other systems use carriage Return. This
type of Host System will not operate correctly on a Parallel
printer and rray not operate correctly on a serial printer if the
baud rate is too fast.
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Radio Shack TRS-80 DT-1 Specifications

General

Brand	Radio Shack
Model	TRS-80 DT-1
Category	Desktop
Language	English