1 May
2008
1 May
'08
9:31 p.m.
On May 1, 2008, at 9:25 AM, Hellwig Geisse wrote:
On Thu, 2008-05-01 at 09:04 -0400, Brad Parker wrote:
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:
<http://64.233.167.104/search?q=cache:Cp9qctiIuLcJ:www.cs.bell-labs.com/who/dmr/odd.html+dmr+eae&hl=en&ct=clnk&cd=4&gl=us
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. (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
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