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NAME   rev ADDR type chip Description
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HHPOSR  H 1DA  R  A  DUAL mode hires Hbeam counter read
HHPOSW  H 1D8  W  A  DUAL mode hires Hbeam counter write

	This the secondary beam counter for
	the faster mode, triggering the UHRES pointers & doing the
	comparisons for HBSTRT, STOP, HTOTAL, HSSRT, HSSTOP
	(See HTOTAL for bits)