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.