[comp.arch] More On Write-Only Control Register

gelsey@convex.UUCP (06/22/88)

Write-only registers have a number of advantages:
	1) Extremely fast
		Even a CMOS write-only register will operate in under a
		nanosecond.
	2) Very low power power dissipation
		Typically they draw in the sub-microamp region
	3) Very space efficient
		One can fit at least an order of magnitude of wo-registers
		in the same space as a rw-register.
	4) Readily available
		Any semiconductor salesman worth his salt will be happy to
		sell you a truckload full on a moment's notice.  Second
		sources are no problem.

These days most commercial computer designers attempt to use write-only
registers wherever possible.