OSWORD &99

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OSWORD &99 (153) Perform BeebLink request
On entry:
 XY?0   =inward control block size
 XY?1   =returned control block size
 XY?2   =command
 XY?3   =sub-command/returned status
 XY!4...
On exit:
 XY?2   =&00 if call actioned
 XY?3   =returned status
 XY!4...