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__________________________________________________ HARDWARE
VERSATILE INPUT/OUTPUT PORTS
The standard 820-11 system is equipped with six ports for input and output. Four of the ports are located on
the back of the display unit, as shown below. Two of the four ports are used for the standard keyboard and
disk drive system components. The fifth and sixth ports are located inside the display unit. (Detailed
information on port assignments is given on pages 30 and 31.)
DISK DRIVE
KEYBOARD
PRINTER
COMM
PARALLEL PORTS
EXPANSION SLOT
DISC DRIVES
KEYBOARD
PRINTER
COMM
DISC DRIVES
KEYBOARD
PRINTER
OISC
~IYU
...
n.o .... o
''''NHII
co ....
DISC DI"'IU
IIl(Y'OAIIlO
PIIIINTI" •
co ....
Used for connection of either the 8" or the
5V4"
Dual Floppy disk drives, or
the 8" Rigid Disk Drive.
Used for connection of the keyboard, which is where data is input.
A serial printer can be connected to this standard RS-232 port.
This port can be used for standard RS-232 communications input/output via
a modem.
The dual parallel port inside the display cabinet is provided for the conveni-
ence of users who wish to use a parallel printer or other parallel input/output
devices. '
The expansion slot inside the display cabinet provides all of the Z80-A
control signals for connection to custom devices for future expansion.
13
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