Radio Shack CCR-81 Operation Guide

ADVANCED FEATURES OF NETWORK 3
Equipment Choices
Any TRS-80 Model III microcomputer that has the minimum features listed under
Equipment Requirements on page 3 can be used with the Net work 3 system.
Note: Since the Student Station System Software and NBASIC occupy
approximately
9K of memory, some 16K programs will require an additional 16K of
memory
to run. Additional RAM (available at Radio Shack Stores and Computer
Centers) may be purchased and installed in 16K increments up to a maximum of
48K.
The Host computer is always completely dedicated to the Network 3 when the Host
program is running; at this time it can only receive requests from Student Stations
and perform those requests.
A disk-equipped Student Station will retain the use of its cassette 1/0 port (the
round socket where
the cassette is plugged in), but its disk drives will be disabled
as long as
it is participating in the network.
Note: Pressing the Reset button of the Host computer or any Student Station will
return the computer to its regular independent operations. The cable on the back of
the TRS-80 does not need to be disconnected to operate the computer
independently.
Printing and Spooling
All Student Station printing requests are routed to the Host printer under normal
conditions. (If you want to use a local printer at a Student Station, see the
discussion of CMD''H '' on page 26 of the Network 3 BASIC Quick Reference
section.)
When a
printing request goes to the Host computer, a function called "spool "
stores the material to be printed until the printer can get to it. This allows the
Student Station to continue working while its request is still being printed, or
possibly before its request has begun to print if another request was already on the
spool.
If a large amount of printing has been requested, the spool storage space will fill
up. When
this space is full, Student Stations requesting printouts will have to wait
until more printing has been completed, making more spool storage space available,
before proceeding.
If the printer is turned off, or runs out of paper, the spool will
fill
to its maximum volume and continue to wait for the printer. When the printer
is ready, the spool will begin to print everything that was requested.
If requests are small enough, many can be sent to the spool during a class period.
Ten minutes before
the end of class the printer can be turned on to print them all
at one time. This technique can be used to keep printer noise from interrupting
other activities.
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Radio Shack CCR-81 Specifications

General

Brand	Radio Shack
Model	CCR-81
Category	Desktop
Language	English