Corona PPC-400

Overview

This keyboard was OEMed for Corona Data Systems.

This keyboard is an XT keyboard that was designed for luggable computers. This keyboard technically falls under the NMB First Generation series of keyboards but was OEMed for Corona Data Systems as they manufactured luggable computers for many different companies such as Philips.

Switches
Keycaps
Upper Case
Mounting Plate
PCB
Back Plate
Cable

Switches

Keycaps

The keycaps are made out of PBT with dye-sublimated legends. These keycaps are pressure fitted as they lack the clips that can be found on all keycaps after the First Generation of NMB keyboards.

Upper Case

The upper case is made out of a single piece of beige ABS plastic. The plastic is textured due to the molding process that is used to create the upper case.

Back Plate

The backplate consists of a single plate with a V-shaped trough that is offset from the top edge of the upper case and runs laterally parallel to the top edge. The backplate is black. Early models of the first generation keyboards contain a steel backplate where later models used plastic for the backplate. Note that earlier models contain a grounding screw in the back plate where later models do not.

Switch Plate

The switch plate is made out of stamped steel. The plate has deeper stamping around the switches so that the entire switch plate could be produced with less material. The plate is only coated with a clear coat.

PCB

The PCB is a double-sided PCB with all traces on the backside of the PCB. The controllers found on the PCB vary, some later models have been found with both Toshiba and Mitsubishi controllers.