=> R0 = -1 for current mode
(if < 256) source mode
(if >= 256) pointer to sprite area
R1 = (if R0 < 256) source palette pointer, or -1 for current palette
(if R0 >= 256) pointer to sprite name/sprite in area pointed to by R0 (as specified by R4)
R2 = pointer to buffer, or 0 to return size needed in R3
R3 = size of buffer (if R2 is nonzero)
R4 = flags (only used if R0 >= 256)
<= R2 = incremented by words written
R3 = remaining size of buffer
This call reads the screen's palette or a sprite's palette. All entries are returned as true 24 bit RGB, calibrated if required. In 256 colour modes the full 256 palette entries are returned, rather than the 16 used by VIDC 1.
See PRM 3, page 387.
Read Palette flags
Bit Meaning if set
0 R1 = pointer to sprite (otherwise sprite name)
1 return flashing colours (default is not to return flashing colours)
other bits reserved (must be zero)
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