[Simh] FPP8A

[Johnny Billquist]

On 2016-04-10 02:27, Bob Supnik wrote:
> The PDP8 simulator is a superset. It has a mixture of PDP8/E and PDP8/A
> features and peripherals. (For example, the RL8A was unique to the 8/A.)
> Most PDP8 software is written to be processor agnostic.

Well...The RL8A also works just fine an an 8/E. Same as the FPP8A. You 
just need a hex backplane. Which was possible to hook up. I actually 
have such a setup. And while I do have an RL8A I do not have an FPP8A. :-(

> The PDP8 (original) and 8/I had unique peripherals, and these are mostly
> not simulated. For the PTR/PTP, TTI/TTO, CLK, and RF, the old
> controllers are the same as or proper subsets of the 8/E and 8/A
> controllers, but the early 8s had different and incompatible controllers
> for DECtape, magtape, and cartridge disks, among others.

Right. Before the 8/E, there wasn't as much a proper generic bus on the 
PDP8. Each controller had its own set of cards in a rack of cards, and 
you had to connect that to the CPU. And you sometimes had some area of 
the backplane where the CPU was also prewired for some specific 
controller. And a controller was a whole bunch of cards that were sortof 
generic, which you just added in the combinations needed for the 
functionality you wanted.

	Johnny

>
> /Bob
>
> On 4/9/2016 3:08 PM, Ray Jewhurst wrote:
>>
>> Thanks Bob, this will help me a great deal. A question though,
>> everything I've read has been for the PDP -8/A.  Doesn't simh simulate
>> the E?
>>
>> Thanks
>> Ray
>>
>> On Apr 9, 2016 2:41 PM, "Bob Supnik" <bob at supnik.org
>> <mailto:bob at supnik.org>> wrote:
>>
>>     It was never added to the SimH manual. I've submitted a new
>>     version to the GitHub editor for merging.
>>
>>     /Bob
>>
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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