This is probably applicable to all the other Powerbook 1XX machines as well as there are little variances between them. I took a gander at the 145 schematics and the 180c is basically the same in this department.
The key here is to attach a shottky barrier diode much in the same way you do on other machines such as the Plus, to a switched 5V source so the BlueSCSI or other termpower peripherals will turn off when the laptop is turned off...
You can pick this up at the 5V supply going to the floppy disk drive. I would have grabbed it from the SCSI port, but the 180C it is not so easy to do so. There are a pair of capacitors connected to pin 5 of the HDI port which is termination power. those capacitors don't go anywhere but filter the termpower line.
Diode goes in between the Switched 5V source which is roughly 5.2V since the circuitry is basically designed similarly to the PB100 and Backlit portable, and the termpower pin.
Pictures are attached:
The key here is to attach a shottky barrier diode much in the same way you do on other machines such as the Plus, to a switched 5V source so the BlueSCSI or other termpower peripherals will turn off when the laptop is turned off...
You can pick this up at the 5V supply going to the floppy disk drive. I would have grabbed it from the SCSI port, but the 180C it is not so easy to do so. There are a pair of capacitors connected to pin 5 of the HDI port which is termination power. those capacitors don't go anywhere but filter the termpower line.
Diode goes in between the Switched 5V source which is roughly 5.2V since the circuitry is basically designed similarly to the PB100 and Backlit portable, and the termpower pin.
Pictures are attached:
