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When the AmSYS 8/8 Development
System is used,
P3 of the
Evaluation Board is connected
to P4 of the Development Sys-
tem's CPU board
(Am95/4005)
for up/down
1
oadi ng and con-
trol from the Development Sys-
tem's console.
This is illus-
trated in figure 2-2b.
The pin connections are shown
in table 2-6.
See the Am8255A
Data Sheet for more details.
P4 - 26-pi n connector used to at-
tach the optional
keyboard/
display
console
(Am96/4016-
KBD), or for genera l-purpose
parallel I/O.
The
cable-connection
method
for the keyboard/di spl ay con-
sole is illustrated in figure
2-3.
The pin connections listed in
table 2-7 include keyboard re-
turn and scan lines (RO-R2,
SO-S2) and port addresses for
LED
characters
(Ports
FCO
through FDO).
P5 - 26-pin connector to the RS232C
interface of one of the two
Am9551
seri all /0 ci rcui ts,
pl us three pi ns connected to
channel 0 of the Am8253 coun-
ter/timer circuit.
This connector can be used for
time-controlled
serial
I/O
(e.g., process controllers), a
host computer other than the
AmSYS 8/8 Development System,
or any other RS232C serial de-
vice.
2-10
The I/O port address for data
through this connector is FEF
or FED (they are equivalent).
The pin connections are given
in table 2-8.
Parenthesized
numbers are the correspondi ng
EIA pin numbers for RS232C.
See the Am9551 and Am8253 Data
Sheets for more details.
P6 - 26-pin connector to the RS232C
or
20mA
current-loop
(TTY)
interface of one of the two
Am9551 serial I/O circuits.
The
RS232C
interface
is
factory-set.
To obtain a 20mA
current-loop interface, turn
the jumper at U56 180 degrees
(see
fi gure
2-4) ,
and
re-
program for baud rate.
This connector can be used for
a system console (terminal) or
any other serial I/O device.
When us i ng an RS232 type CRT
Terminal, it is usually neces-
sary to connect the Cl ear To
Send signal to the Request To
Send signal.
Th is connect i on
can somet imes be made on the
CRT Terminal.
Alternatively,
the Clear To Send line can be
grounded
on
the
Eva
1
uat ion
board by removing the jumper
between U56 pins 3 and 14 and
connecting an insulated jumper
between U56 pins 3 and 6.
The I/O port address for data
through this connector is FEB
or FE9 (they are equivalent).
The pin connections are given
in table 2-9.
Parenthesized
numbers are the correspondi ng
EIA pin numbers for RS232C.
See the Am9551 Data Sheet for
more details.
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