Specifications

CoreModule/PC Technical Manual
2-12
Note
"AT" keyboards are not compatible with "PC" or "XT"
keyboards, and may not be used with this interface.
n An LED lamp can be connected between J4 pins 8 (+5 Vdc) and 7 (Ground) to provide a power-
on indication. An external series current limiting resistor is required for some LEDs (typically
330 ohms).
n A reset pushbutton switch can be connected between J4 pins 3 and 7.
n The real time clock battery, if used, connects between J4 pins 9 (+BATV) and 2 (-BATV).
n If a system power status signal is available, it should be connected to J4 pin 10. A high-true
TTL level signal is required. A low resets the computer.
Pin Signal Name Function
1 Speaker+ Audio signal through 33 ohm series resistor
2 -BATV Backup battery connection
3 Reset Switch Reset control
4 N/C No connection
5 Kbd Data Keyboard data
6 Kbd Clk Keyboard clock
7 Kbd Gnd Ground for keyboard and LED
8 Kbd Pwr +5 V for keyboard and LED
9 +BATV Backup battery connection
10 Power Good True when power is good
Table 2-7. Utility Connector (J4)