=> R0 = 112
R1 = bank number
<= R0 preserved
R1 = previous bank number
R2 corrupted
This call selects the bank of screen memory which is to be used by the VDU drivers according to R1, where 0 means the default for the current mode (1 or 2). Any other value means to set the screenbank which starts at Screenstart+(R1*Modesize). The maximum bank number is TotalScreensize/ModeSize. The default bank for a non-shadow mode is 1, for a shadow mode is 2.
See PRM 1, page 639
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