•
TANDY COMPUTER PRODUCTS •
The palette mask MUX
is
used
to
switch between incoming RGBI
data and the palette address register. During
a
CPU write
to the palette, this address register selects one
of
the
16
palette locations. Also, the palette mask MUX allows any
of
the input RGBI bits
to be
set
to
zero.
The palette allows the
16
colors
to be
remapped
in
any
desired organization. Normally the pallete
is
set
for
a 1:1 mapping (red
=
red, blue
=
blue, etc.) for
PC
compatibility. However, instantly changing the on-screen
colors
is a
very powerful tool for animation
or
graphics
programs.
After the palette, the RGBI data
is
resynchronized
in the
Post Palette register. The final logic before the RGBI data
is buffered off the chip
is
the Border MUX. This MUX
allows the Border
to be
replaced with any color selected
by
the border color latch. This latch
is
normally disabled
in
PC modes, but
it is
used
in
all PCjr modes.
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