At 06:48 PM 8/15/02 +0200, Lars Brinkhoff wrote:
>Anders Magnusson <ragge@ludd.luth.se> writes:
>> > > cpu: KL10E, serial number 01, microcode version 0442
>> >        ^^^^^
>> > Where does the "E" come from, exactly?
>> > 
>> The "DECSYSTEM20 Technical Summary" says that if a KL10 has hardware for
>> extended addressing it is a KL10-E.
>
>According to
>        http://www.inwap.com/pdp10/models.txt
>it can also be a KL10-E+, KL10-R, or KL10-R+.
>
>There is also something else going on.  The "innermost" CPU thing can
>be a KL10-PA, KL10-PV, or KL10-PW (the latter supporting extended
>addressing).  I *think* this may be the processor card, or stack of
>cards etc, while KL10-E etc are the whole box with some stuff other
>than the processor proper.
>
>Also, extended models are called "KL10 Model B" or just "KL10B" or
>sometimes "KL10-B", though this is also the name of an early processor
>model without extended addressing.  Finally, "Model B" also somehow
>refers to the back plane.

The Model A backplane supports 1280 words of microcode and the Model B
backplane supports 2048 words of microcode.

>So what's the proper name of a KL10 processor supporting extended
>addressing is, I don't know.  KL10B seems most common, though.

This gets into what you are going to have for a front-end/maintenance
processor. A KL10B will need an emulated PDP-11/40 with emuated DECtapes. A
KL10E+ would have bigger emulated cache and emulated floppies on the
emulated PDP-11/40.

Michael Thompson
E-Mail: M_Thompson@IDS.net