After getting the #Commodore#C64 and #C128 running again, the next device to repair is the #C1571.
It had #corrosion and #rust on the main board and the power supply is beyond repairworthiness. I'd replace the latter with a #meanwell RD-35 with 5 and 12 volt output.
One #diode was rusty, a few traces needed #cleaning and five #resistor looked bad. Hope the black hybrid chip is still okay.
Sadly, the lower read head seems to be broken, my work might've been in vain. #floppydrive#retrocomputer
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I've got a busted consumer product here that has 2 #Holtek#microcontrollers in it. Either one would be sufficient to run this product (a brushless-motor tower fan), but #MCUs are cheap, so why not throw a second one in if it saves a few centimeters of wire?
I'm trying to determine if there's a #standard#serial#physical#layer in use here to communicate from one #MCU to the other. It's one-way communication.
The connection from one MCU to the other is a single #signal#wire, plus shared #power and #ground. It's a point-to-point link; there's no addressing involved. It's simplex, so no collision detection or anything complicated.
In fact, it's dirt-simple, and extremely low-bandwidth. The secondary MCU transmits a single #byte of data to the primary MCU approximately every 120ms. So ~70 bits per second, max.