EXTERNAL SYSTEM
v0
This section describes each I10 interface in detail, and some of the
tradeoffs made with respect to
AI
000 compatibility.
The Amiga 2000 and Amiga
500
have differences in the serial and
parallel ports from the Amiga 1000, the main difference being
changes in the sex of each port (changing the serial to female and the
parallel to male), which allows the new Amigas to use standard inter-
face cables.
RS232
and
MIDI
Port
The RS232 connector on the
A500
and A2000 is form fit and func-
tion identical to a Commodore PC- 10120 with a few exceptions.
This
is
the
OPPOSITE
sex
connector from
the
A1 000.
The connector
is a shielded male
DB25P connector. The A1 000 supplies various
non-standard
RS232 signals on the DB25 connector. These non-
standard signals were removed wherever possible. The
RS232 con-
nectar
is NOT physically compatible with some
MIDI
interfaces but is
compatible with the
~miga ~odem/1200 RS (model 1680). Below is
a comparison chart between the
RS232 standard, a Hayes Smart-
modem standard, the A1
000
RS232, and the new Amiga 50012000
RS232 connector.
AS001
PIN
RS232
A1000 A2000 PC10 HAYES@ DESCRIPTION
GND
TxD
RxD
RTS
CTS
DSR
GND
DCD
-
-
S.SD
S.CTS
S.T
X
D
TxC
S.R
X
D
RxC
-
S.RTS
DTR
SQD
R
I
SS
TxCl
-
Frame ground
Transmit Data
Receive Data
Request to send
Clear to send
Data set ready
Signal ground
Carrier detect
+
12 volt power
-
12 volt power
Audio output
Speed Indicate
GND
TxD
RxD
RTS
CTS
DS
R
GND
DCD
GND
TxD
RxD
RTS
CTS
DSR
GND
DCD
+
12v
-
12v
AUDO
-
CND
TxD
RxD
RTS
CTS
DSR
CND
DCD
+
12v
-
12v
GND
TxD
RxD
-
CTS
DSR
GND
DCD
-
-
5Vdc
AUDO
AUDl
EB
INTZ*
-
5
volt power
Audio output
Audio input
Port clock 71
6KHz
Interrupt IineJAudio input
AUDl
DTR
+
5Vdc
DTR
DTR
-
DTR
Data terminal ready
+
5
volt power
Ring indicator
+
12 volt power
3.58MHz
clock
Buffered system reset
C2*
RESB*
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