[Simh] PDP-8 FPP register name descriptions

[Ray Jewhurst]

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
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>>
>>
>>
>>
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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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