Re: SC/MP timing and microcode information
On this thread and the Mk14 VDU thread we were speculating whether the SC/MP NENIN input responds immediately or whether the SC/MP completes its current cycle before relinquishing.
I think I can say with confidence that it relinquishes immediately, probably via asynchronous logic so there's not even a clock delay. I think the SC/MP gets straight off the bus but takes note if it has been knocked back part-way through a cycle. It will try again when the buses subsequently become free again, perhaps multiple times. There must be a point in each memory cycle when the SC/MP deems 'mission accomplished' and ceases retries.
Do people concur with this analysis?
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