What's CIS for? (was RE: Original 11/74 front panel) - test-drb@ccmp.vtda.org

11 Feb 2006

Yes, I stand corrected. I should have written EIS, Extended Instruction Set.
And as Billy points out, FIS is *not* FP11-x or FPP-x.
I might have taken a bit more time to write it down correct the first time.
OTOH, this is a thread worthy of CC, which is not always the case :-)

  have a nice weekend,
- Henk.

________________________________

Van: cctalk-bounces at classiccmp.org namens Tom Uban
Verzonden: vr 10-02-2006 20:58
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: RE: What's CIS for? (was RE: Original 11/74 front panel)

At 08:44 PM 2/10/2006 +0100, you wrote:

...
 now you got me thinking, Zane.
I have FIS in my 11/44, and I am not sure I have CIS either installed
in the /44, or the module is somewhere, or I passed on it for the same
reason I did not install the CIS chip in the QBUS-based 11.
My 11/35 OTOH does have FIS and CIS (and MMU plus SLR), but 
Do you mean EIS (M7238) instead of CIS here?

--tom

...
 that's just to have a complete CPU with *all*
options :-)

- Henk.

________________________________

Van: cctalk-bounces at classiccmp.org namens Zane H. Healy
Verzonden: vr 10-02-2006 20:27
Aan: cctalk at classiccmp.org
Onderwerp: Re: What's CIS for? (was RE: Original 11/74 front panel)

 Speaking of CIS, can anyone point me to a good document as to what the
 benefits of CIS are?  I've often wondered what this is about, as it's a
 plug-in chip on my 11/23+

As I recall, it's for *business* computing, rather than *scientific*
computing.  I think it speeds up Cobol, and maybe some other stuff.

Out of *all* of my PDP-11's, the only system I have with the CIS option is a
/23+.  I rather wish I had it for my /44, though I don't actually need it
:^)

                 Zane

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