Editing Nabu KBD-2 (section)

===Internals===
A [[Alps SKCC Lock|SKCC Lock]] switch is present on the "CAPS" key. The [[Alps SKCC Cream|SKCC Cream]] switches are infilled with a sort of resin or glue in the switch terminal recess, supposedly to prevent dust or solder fume incursion during manufacturing. They are the black switchplate variant, likely manufactured around 1982 using IC dating.

The switches are soldered to a PCB and clipped into a painted black steel plate on one side. The switch-plate assembly is then secured to the bottom half of the case with double-sided foam tape. The adhesive from the tape corrodes the steel plate over time, and the corrosion is present on NOS (new old stock) units. There are four slots for screws present on the plate; however, these are not used in the keyboard.

The PCB is connected to the controller board through a ribbon cable that is soldered in. The controller on the keyboard is a Motorola MC6803P.

There is a female DIN-6 connector present on the back side of the keyboard labeled "TO COMPUTER," along with two DB-9 joystick ports labeled "CONTROLLER" with a number below each port. All of the ports are soldered onto the controller board. Pins one and six are unused on the DIN-6, pins two and three for power, and pins four and five for data. The shield is connected to ground.