=> R0 = 114
R1 = 0 modes will be shadow
1 modes will be non-shadow
<= R0 preserved
R1 = previous shadow sate
R2 corrupted
This call determines whether future mode changes will be forced to use shadow state. OS_Byte 112 and 113 control the use of shadow banks.
Shadow state requires twice the amount of RAM than the equivalent non-shadow mode since two copies of the screen are stored in memory.
See PRM 1, page 643
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