[Simh] PDP-8 FPP register name descriptions

[Tom Morris]

Without digging two deeply into it, at least some of them are just slight
name variants.

FPAC0-4 == FAC (Floating Accumulator) - it has varying sizes depending on
the mode
CMD == Command
XRA == XO (Index) - it's called "idx reg pointer" in the comment

Tom

On Sat, Apr 9, 2016 at 7:32 AM, Ray Jewhurst <raywjewhurst at gmail.com> wrote:

> Those registers are in the pdp8_fpp.c file. As for the other ones, I
> already utilized them.
>
> Thanks
> Ray
> On Apr 9, 2016 5:08 AM, "Johnny Billquist" <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>> 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>> 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
>>>         _______________________________________________
>>>         Simh mailing list
>>>         Simh at trailing-edge.com <mailto:Simh at trailing-edge.com>
>>>         http://mailman.trailing-edge.com/mailman/listinfo/simh
>>>
>>>
>>>
>>>
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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
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>
>
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