Segher Boessenkool wrote > On Fri, Feb 01, 2019 at 02:12:39AM -0600, vossi wrote: >> At page A-6 3.4 are the absolute,x addressing cycles. >> There is also a T3 cycle (always - not only at page boundarys) with >> discarded read. But I measured this with my 6509 and had no dummy read!!! > > Interesting. It sounds like the 6509 does away with the last cycle of > those insns (which handles the carry in the address, on 6502). > > Segher Very interesting: I've taken a *brief* look at the decode rom of the 6509R7 and the 6502D and found no apparent change... As soon as time permits I will dig into this deeper! However can someone confirm this changed behaviour independently? In case someone wants to take a look: 6509R7A_decode.jpg <http://cbm-hackers.2304266.n4.nabble.com/file/t374877/6509R7A_decode.jpg> -- Sent from: http://cbm-hackers.2304266.n4.nabble.com/Received on 2019-02-04 11:00:03
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