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Chapter 12 Interrupt Functions
12
(b) With ring control
Modulo register
(MR)
Ring counter
(RC)
Macro service counter
(MSC)
Data macro service pointer,
low (MPDL)
Data macro service pointer,
high (MPDH)
Timer macro service pointer,
low (MPTL)
Timer macro service pointer,
high (MPTH)
Mode register
Channel pointer
Macro service channel
Macro service control word
Higher address
Lower address