[Simh] PDP-8 FPP register name descriptions

[Ray Jewhurst]

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> 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> 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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