=> R0 = 243 (&F3)
R1 = 0
R2 = 255
<= R0 preserved
R1 = switch state
R2 corrupted
This call is obsolete - it reads which of the two copies of the centisecond clock is read/written to by OS_Word 3 and 4, and which is updated on the 100Hz interrupt. In effect it provides a location that changes 100 times per second.
See PRM 1, page 407
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