NCR 5932, Руководство пользователя

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Chapter 1: General Overview 1-9
With the 5932 PS/2, this is accomplished by using firmware that senses
both plungers and the time lag between the plungers. If adjacent
plungers are pressed within a certain interval, then the firmware only
sends one of the two. Which one it sends is fixed, and the time lag is
fixed. Thus, although this method works, it is subject to occasional
error due to small mechanical tolerance problems. It is also somewhat
limited in flexibility.
With the 5932 USB, the keyboard is fully programmable. Two keys that
are capped together can be programmed to literally BE the same key.
(Duplicate messages are discarded.) Thus there is no limit to the
flexibility, and no problem can be induced by the same minor
mechanical problems experienced with the 5932 PS/2 keyboard.
Keyboard Programmability
The 5932 PS/2 keyboard includes the ability to select whether the
keypad should be telephone- or calculator-style. This is implemented
with a simple toggle that selects which layout is to be selected. No
other programming is possible.
The 5932 USB keyboard includes full programmability of the keyboard.
Each and every key can be re-assigned as desired, and is only limited
by the capabilities of a standard USB-HID keyboard. Based on registry
entries, a program on the PC sends a complete keyboard layout matrix
to the keyboard firmware. From that moment on, the firmware sends
the newly assigned set of keys over the USB connection. No translation
software is required in the host PC.
New key values are assigned using registry entries. This means a
keyboard can be replaced in the field without any extra programming
steps. Once the terminal has been set up with key assignments, a
replacement keyboard will automatically receive the programmed key
assignments. Key assignments are sent from the registry whenever an
NCR USB keyboard is connected to the PC, whether at power-on or
hot-plugged.