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- To: hatari-devel@xxxxxxxxxxxxxxxxxxx
- Subject: [hatari-devel] 68030 instruction time calculation formulae
- From: Douglas Little <doug694@xxxxxxxxxxxxxx>
- Date: Mon, 29 Dec 2014 11:29:45 +0000
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The link below may be useful when looking at emulation timings vs real
world (at least, for cached code - the uncached code case is more complex
to match exactly, albeit perhaps less important to do so for emu purposes)
http://cache.freescale.com/files/32bit/doc/ref_manual/MC68030UM-P2.pdf
See page #187 "Instruction Execution Timing Calculations" and in particular
section 11.3.4 on EA adjustments and instruction overlaps, and the summing
formula provided.
[Caveat: the text assumes bus events consume 2 cycles always, which is not
true for us, add needs accounted for where it matters]