=> R1 = &8A (reason code)
R2 = 0 power up
1 power down
R3 = bitmask of ports which will be powered down/have been powered up
<= R1 = &8A (don't claim, unless R3 = 0)
R2 preserved
R3 = bitmask - set bits mean no objection to power up/down
This service is issued before powering down, or after powering up certain hardware. If a module wishes to prevent power down it should clear the appropriate bits for that hardware. If this results in R3 = 0, the service should be claimed to prevent it being needlessly passed round remaining modules.
See PRM 4, page 197
Bitmask of ports
Bit Hardware
0 Econet
3 Serial oscillator and buffer
14 Floppy Disc Controller oscillator
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