page 2 22
THEORY OF OPERATION
Keyboard
A s shown in Pictorial 2-5, this circuitry is made up of a
keyboard and a keyboard encoder.
The encoder detects a closed key contact in the keyboard
and converts it into the corresponding ASCII code for that
key.
8041A
OR
8741A
KBD
ENCODER
SYSTEM RESET
KEY STROBE
EXT.
KEYBOARD
KEYBOARD
DATA
Pictorial 2-5
Keyboard Block Diagram
KEY CLICK
I/O Circuitry
The I/O circuitry consists of a 6821 parallel printer port, two
2661-2 serial ports, and a TTL control latch for internal use
of the main board, as shown in Pictorial 2-6.
PARALLEL
PR INTER
6BA 21
EXTERNAL
CONNECTION
SERIAL
N O. 1 ( A )
2661-2
EXTERNAL
CONNECT ION
SER IAL
N O. 2
( B )
2661-2
EXTERNAL
CONNECTION
Pictorial 2-6
I/O Block Diagram
CONTROL S I
GNAL
INTERNAL
CONNECTION
TTL
LATCH
Summary of Contents for Z-100 Series
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