=> R0 = 250 (&FA)
R1 = 0
R2 = 255
<= R0 preserved
R1 = VDU driver screen bank
R2 = display screen bank (see OS_Byte 251)
This call reads the screen bank used by the display, as set with OS_Byte 112. This call should not be used to write the value - doing so would only change the value in memory, without affecting the hardware.
See PRM 1, page 671
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