Contended memory: Difference between revisions

Contended memory (view source)

43 bytes added , 23 February 2011

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 === +2A / +3 ===
-The +2A / +3 ULA differs more significantly in that it applies less contention than the 48K or 128K ULAs. Specifically, it applies contention only if the MREQ line is active, whereas the 48K ULA applies it under all circumstances. In the table below, contention patterns which differ on the +3 are shown in ''italics''. The timing pattern also differs significantly:
+The +2A / +3 ULA differs more significantly in that it applies less contention than the 48K or 128K ULAs. Specifically, it applies contention only if the MREQ line is active, whereas the 48K ULA applies it under all circumstances. In the [[#Instruction breakdown|instruction breakdown table]], contention patterns which differ on the +3 are shown in ''italics''. The timing pattern also differs significantly:
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