Glossary
This glossary defines terms for the purposes of using and programming
the PCR II Plus. These meanings may not coincide with other uses nor
with formal definitions.
Brightness Level
One of nine CRT intensities (0 through 8). The user or the internal sys-
tem assigns a subset of intensities to red, green and blue colors in a
given mode.
Bus
A circuit path over which information passes.
Cathode Ray Tube (CRT)
A vacuum tube in which an electron beam, directed at a phosphor-
coated glass screen, causes a point on the screen to glow. As magnetic
coils deflect the beam, the point of light moves across the screen. Vari-
ations in the intensity of the beam create a contrasted visible display
on the screen.
Checksum
The result of summing data bytes after a data transfer. The resultant
checksum is used to verify that the data were transferred properly.
DIP
Switch
A set of switches encased within a single package (a "dual in-line pack-
age" or DIP) which can be set by hand.
DRAM
A form of memory, continually refreshed, possessing both read and
write capability. Memory contents are lost when the power is turned
off.
Appendix • A-9
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