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The AUX (auxiliary interface) socket supports two input lines (pins 2
and 5) and two output lines (pins 2 and 4). The I/O lines are driven
by 1488 and 1489 line driver chips which are, in turn, connected to
the I/O lines of the AY-3-8912 (see the manufacturer's data sheet for
this device). Basically, register 16 of the AY-3-8912 controls eight
I/O lines, the bits are designated as follows...
| Bit |
Name
|
| 0 |
AUX pin 2 (out)
|
| 1 |
AUX pin 4 (out)
|
| 2 |
RS232 pin 5 (CTS out)
|
| 3 |
RS232 pin 3 (RXD out)
|
| 4 |
AUX pin 3 (in)
|
| 5 |
AUX pin 5 (in)
|
| 6 |
RS232 pin 4 (DTR in)
|
| 7 |
RS232 pin 5 (TXD in)
|
Using software control loops, the I/O lines could be driven as a
second RS232 port (in the same way as the RS232/MIDI socket is driven
using bits 2, 3, 6 and 7). Alternatively, the I/O lines could be used
to drive, for example, a robot or some other external device.
___________________________
__| 6 5 4 3 2 1 |
|__ ### ### ### ### ### ### |
|___________________________|
AUX socket
| Pin |
Function
|
| 1 |
GND
|
| 2 |
OUTPUT BIT 0
|
| 3 |
INPUT BIT 4
|
| 4 |
OUTPUT BIT 1
|
| 5 |
INPUT BIT 5
|
| 6 |
+12V
|
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