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general information
1.5
IRPUT/OUTPUT DEVICES
The input/output devices consist of a keyboard, a CRT display, and
two telecommunication interfaces.
1-4
1.5.1
KEYBOARD
The keyboard consists of 101 keys mounted on a single-sided
printed circuit board.
All keys are momentary action key
switches.
They are scanned periodically by the micro-
computer to determine if a key closure has occurred.
Figure 1-3 illustrates the WY-SO keyboard.
A more complete
description is found in Section 4.4.
1.5.2
CRT
DISPLAY
The WY-SO features a l4-inch CRT.
It displays 24 rows of
characters (either SO or 132 column) and 2 control rows (one
for terminal status and one for function key identifi-
cation).
The displayed characters are read from RAM by the
CRT controller on a direct-memory access basis.
The CRT
also contains an integral power supply which provides power
for the rest of the logic.
1.5.3
TBLBCOMIIURICATIORS
The WY-SO has two independent asynchronous interfaces which
conform with the EIA standard RS-232C.
Data rates can be
set independently for either interface.
These parameters
are operator controlled and are defined in the setup pro-
cedures in the Installation section of this manual (2.4).
The primary (modem) interface can communicate at data rates
up to 3S.4K bps.
The auxiliary (printer) interface can
communicate at data rates up to 19.2K bps.
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