Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!yale!quasi-eli!cs.yale.edu!fischer-michael From: fischer-michael@cs.yale.edu (Michael Fischer) Newsgroups: comp.sys.atari.st.tech Subject: Re: Instruction timings ? Message-ID: <27994@cs.yale.edu> Date: 10 Jan 91 14:12:50 GMT References: <18805@shlump.nac.dec.com> Sender: news@cs.yale.edu Organization: Yale University Computer Science Dept., New Haven, CT 06520-2158 Lines: 21 Nntp-Posting-Host: ginkgo.theory.cs.yale.edu Originator: fischer@ginkgo.CS.Yale.Edu In article <18805@shlump.nac.dec.com> jamie@defoe.enet.dec.com () writes: >Hello! > >I wonder if anyone has a listing of 68000 instruction timings for the ST >? I've got a couple of books on ST internals and 68000 programming but >neither of them mention instruction speeds at all. I'm trying to write >some code to remove all the borders so I need to know exactly how many >clock cycles each instruction takes in my code... > >Can anyone help ? Sure. Get the Motorola MC68000 Microprocessor User's Manual, published by Motorola, Inc. The instruction timings take up 8 pages of an appendix (in the version of the manual that I have)! They are quite complicated and depend on the particular instruction, addressing mode and lengths of the two operands. -- ================================================== | Michael Fischer | ==================================================