[Simh] PDP-8 FPP register name descriptions

[Johnny Billquist]

On 2016-04-09 13:32, Ray Jewhurst wrote:
> Those registers are in the pdp8_fpp.c file. As for the other ones, I
> already utilized them.

But then you do not need documentation on the FPP8A, so the question at 
the start was misleading. We're now talking about the implementation in 
SIMH... The registers of the FPP8A are all documented in the Users Manual.

	Johnny

>
> Thanks
> Ray
>
> On Apr 9, 2016 5:08 AM, "Johnny Billquist" <bqt at softjar.se
> <mailto:bqt at softjar.se>> wrote:
>
>     Where do you find those registers? I'm looking at the FPP8A Users
>     Manual, and cannot find them.
>     In that manual you have all the FPP8A registers listed in table 2-1.
>
>              Johnny
>
>     On 2016-04-09 04:19, Ray Jewhurst wrote:
>
>         Hello,
>
>         The register I don't know are FPAC0-4, CMD, XRA, SSF and FLAG.
>         To be
>         honest with you, I know very little about FFP's.  The most I
>         really know
>         about floating point operations is the difference between a
>         float and a
>         double! lol.  I am more of an end user and administrator than I am a
>         coder.  I am glad though that everyone is so helpful and patient
>         with me.
>
>         Thanks
>         Ray
>
>         On Fri, Apr 8, 2016 at 9:04 PM, Ray Jewhurst
>         <raywjewhurst at gmail.com <mailto:raywjewhurst at gmail.com>
>         <mailto:raywjewhurst at gmail.com <mailto:raywjewhurst at gmail.com>>>
>         wrote:
>
>              I already used EK-FFP8A-MM-001 and the Handbook and could
>         figure out
>              about half the registers.  I'm not by my code right now but
>         I will
>              send a message listing the ones I couldn't figure out later
>         tonight.
>              While I was thinking of amending the documentation to
>         include the FFP8A.
>
>              Thanks
>              Ray
>
>              On Apr 8, 2016 7:15 PM, "Rick Murphy" <simh at rickmurphy.net
>         <mailto:simh at rickmurphy.net>
>              <mailto:simh at rickmurphy.net <mailto:simh at rickmurphy.net>>>
>         wrote:
>
>                  At 04:15 PM 4/8/2016, Ray Jewhurst wrote:
>
>                      Hello,
>
>                      I'm trying to expand the help files on some of
>         simulators
>                      and noticed that I can't find much information for
>         the PDP-8
>                      FPP.  I have current documentation but there are no
>                      references to the FPP at all.  If anyone can point
>         me in
>                      the right direction, I'd really appreciate.  I'm also
>                      checking to see if I can get any relevant
>         information from
>                      Bitsavers.
>
>
>                  The most comprehensive documentation is the Maintenance
>         Manual:
>         http://bitsavers.informatik.uni-stuttgart.de/pdf/dec/pdp8/pdp8a/EK-FPP8A-MM-001_FPP8-A_Maint_Sep76.pdf
>
>                  Chapter 2 has the register info.
>
>                  Also, FPP-12 documentation, for example
>         http://bitsavers.trailing-edge.com/pdf/dec/pdp12/fpp12/
>                  The FPP-8A and FPP-12 are register compatible. The
>         FPP-8 has a
>                  few tweaks but it's generally quite compatible.
>
>                  If you want any review of whatever documentation you end up
>                  writing, I'll be happy to help (I did a bunch of work
>         on the
>                  SIMH FPP-8A simulation to get it working and make it
>         compatible
>                  with the real FPP.)
>                           -Rick
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>
>
>
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>
>     --
>     Johnny Billquist                  || "I'm on a bus
>                                        ||  on a psychedelic trip
>     email: bqt at softjar.se <mailto:bqt at softjar.se>             ||
>     Reading murder books
>     pdp is alive!                     ||  tryin' to stay hip" - B. Idol
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-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol