x86 instructionsThis is a discussion on x86 instructions within the ASM x86 ASM 370 forums in Programming Languages category; Hello. Where can i find detailed information about 8086(or other processors) instruction and how flags works. I read intel manuals, but didn't find that i want. Because i am trying to implement simple emulator of 8086(my hobby). I found one page about 6502: http://nesdev.parodius.com/6502.txt . This page is very detailed. I am looking something for x86. Actually i know how instructions works, but still i have big gap how flags works and how to implement even simple adc instruction without any mistakes. Thank you... | ||||||||
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#1
09-02-2008, 11:59 PM
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 x86 instructions Hello. Where can i find detailed information about 8086(or other processors) instruction and how flags works. I read intel manuals, but didn't find that i want. Because i am trying to implement simple emulator of 8086(my hobby). I found one page about 6502: http://nesdev.parodius.com/6502.txt . This page is very detailed. I am looking something for x86. Actually i know how instructions works, but still i have big gap how flags works and how to implement even simple adc instruction without any mistakes. Thank you  |
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#2
09-03-2008, 07:12 AM
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| Re: x86 instructions "kestas.rutkauskas" <spamtrap@crayne.org> wrote in message news:4db637d3-d819-4c50-b99a-9fadf0787650@2g2000hsn.googlegroups.com... > Hello. Where can i find detailed information about 8086(or other > processors) instruction and how flags works. I read intel manuals, but > didn't find that i want. Because i am trying to implement simple > emulator of 8086(my hobby). > > I found one page about 6502: http://nesdev.parodius.com/6502.txt . > This page is very detailed. I am looking something for x86. Actually i > know how instructions works, but still i have big gap how flags works > and how to implement even simple adc instruction without any mistakes. The current online Intel manuals are overwhelming. When I worked on 8086/etc years ago I found the paper datasheets very easy to work with. An example for 8086 is here: http://www.micro.deis.unibo.it/~iafe.../intel8086.pdf All the instruction details are in the last 4 pages. -- Bartc |
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#3
09-03-2008, 08:06 AM
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| Re: x86 instructions kestas.rutkauskas asked: > Hello. Where can i find detailed information about 8086(or other > processors) instruction and how flags works. I read intel manuals, but > didn't find that i want. Because i am trying to implement simple > emulator of 8086(my hobby). > I found one page about 6502: http://nesdev.parodius.com/6502.txt . > This page is very detailed. I am looking something for x86. Actually i > know how instructions works, but still i have big gap how flags works > and how to implement even simple adc instruction without any mistakes. The best source I found on this matter is: AMD64 24594.pdf Appendix E 'Instruction Effects on RFlags' (Sep/2003) There might be newer documents available yet, but this few pages may be still valid for 32-bit AMDs and also for Intel CPUs (+586). __ wolfgang |
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