Editing DIY Robotics and Sensors (section)

== What it is good for, and what it is not ==
Chapters 2, 4, 5 and 9 document the '''Commodore user port and analogue port from the outside''' — signal levels, data direction registers, address decoding and the CB2 output on the PET. That is real, checkable interfacing information and it is the reason to keep the book.

'''It is not a repair source.''' There is no schematic of any Commodore machine in it, no parts list, no component values for any Commodore board and no fault-finding procedure. Its circuits are the author's own designs for things to plug in, not the machine's own circuits.

One piece of bench advice in it has aged well and one has not. The soldering guidance in chapter 1 — tin both wires separately, never carry molten solder on the iron because the crust disguises a dry joint — is sound. The recommendation to buy a '''moving-coil multimeter rather than a digital one''' was reasonable in 1984 for watching a signal swing; see [[Recommended Tools]] for what a modern bench actually needs.