Just an aside - are you sure there was an 80186? I thought the '286 was the direct successor to the 8086/8088 processors (which were essentially the same, just commercially distinct). The "Mark 1" aspect was just implied by specifying the "Mark 2" aspect of the 80286.
Pedrocelli ----- Original Message ----- From: "Neven MacEwan" <[EMAIL PROTECTED]> To: "NZ Borland Developers Group - Delphi List" <[EMAIL PROTECTED]> Sent: Wednesday, September 15, 2004 2:39 PM Subject: Re: [DUG] ShortInt, SmallInt At some point Intel developed/exposed a RISC instruction set, I thought it was the 486 The family goes (from memory) 8080 8085 8088 (IBM PC) 8086 80186 80286 (IBM AT) 80386 (Compaq) 80486 Pentium As for a 'RISC' core, all CISC processors have a RISC core (microcoded or hardwired) In my definition a RISC processor executes instructions in 1 cycle, and as such I think you'll find the majority of the pentium instruction set RISC, though it has a CISC family lineage Neven MacEwan (B.E. E&E) Ph. 09 621 0001 Mob. 0274 749062 Alister Christie wrote: > Thanks Neven, but I think you'll find that the 486 was CISC as were > Pentiums, starting with the Pentium Pro the Intel went down the CISC > interface / RISC core (where complex instructions were broken down > into a reduced instruction set making them more easily pipelined) - > they obviously could not just go RISC (like the PowerPC) due to the > fact that it would make them incompatible with the x86 instruction set. > > But it has been a long time since I studied this kind of stuff so I > could be wrong (and hopefully forgiven). > > Alister Christie > Computers for People > Ph: 04 471 1849 Fax: 04 471 1266 > http://www.salespartner.co.nz > PO Box 13085 > Johnsonville > Wellington > > > Neven MacEwan wrote: > >> Alister >> >> My understanding is the the 386 was a CISC the 486 introduced a RISC >> instruction set, For what it is worth you may consider a CISC >> instruction as >> a series of RISC instructions (microcode) in fact this is how they >> are implemented >> >> Neven MacEwan (B.E. E&E) >> Ph. 09 621 0001 Mob. 0274 749062 > > _______________________________________________ > Delphi mailing list > [EMAIL PROTECTED] > http://ns3.123.co.nz/mailman/listinfo/delphi > > _______________________________________________ Delphi mailing list [EMAIL PROTECTED] http://ns3.123.co.nz/mailman/listinfo/delphi _______________________________________________ Delphi mailing list [EMAIL PROTECTED] http://ns3.123.co.nz/mailman/listinfo/delphi
