[Unix-jun72] svn changes?
milov at uwlax.edu
Fri May 2 01:31:58 AEST 2008
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
>> 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
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: <http://22.214.171.124/search?q=cache:Cp9qctiIuLcJ:www.cs.bell-labs.com/who/dmr/odd.html+dmr+eae&hl=en&ct=clnk&cd=4&gl=us
> (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
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University of Wisconsin - La Crosse
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