From mboxrd@z Thu Jan 1 00:00:00 1970 From: milov@uwlax.edu (Milo Velimirovic) Date: Thu, 1 May 2008 10:31:58 -0500 Subject: [Unix-jun72] svn changes? In-Reply-To: <1209651902.5140.981.camel@papa> References: <1209645318.5140.974.camel@papa> <26098.1209646462@mini> <26275.1209647082@mini> <1209651902.5140.981.camel@papa> Message-ID: On May 1, 2008, at 9:25 AM, Hellwig Geisse wrote: > On Thu, 2008-05-01 at 09:04 -0400, Brad Parker wrote: >> Via email I asked Tim about EAE support in simh, since apout has it >> and >> the code claims he added it to simh, but I can't find it. > > Wasn't this called the "EIS" option? If I remember > well, simh enabled that by default if you choose the > CPU to be an 11/40. No... EIS is not the same as EAE, though simh does include EIS in its 11/40 configuration. From memory: EAE is the "Extended Arithmetic Element" which provided multiply, divide and shift capabilities through registers in the I/O space. See Dennis Ritchie's "Odd Comments and Strange Doings in Unix" the pertinent item is "A hardware story" at the the end of the document, cached here: (It seems the link provided by Google to dmr's website is down...) EIS is the Extended Instruction Set, which on the pdp11/40 (and lsi11) went hand in hand with FIS, the Floating Instruction Set. See a pdp11 processor handbook for all the details. -- Milo Velimirović, Unix Computer Network Administrator 608.785.6618 Office - 608.386.2817 Cell University of Wisconsin - La Crosse La Crosse, Wisconsin 54601 USA 43 48 48 N 91 13 53 W