Apple IIe Mystery Boards

[Jeff Lemke <lemke@terra.cira.colostate.edu>]

Can anybody clue me in on a few interface cards I found?  One board says it's a 
PKASO Interface.  There are 8 rather long wire prongs coming out and bent up at a 
90-degree angle on the left end, and there's a 16-pin connector on the right end.

Another board has a series of what might be memory chips along with a Z80A CPU.  
I'm guessing the Z-80 allows you to run CPM programs.  Is that correct?

There are a couple other boards that weren't installed in anything.  They're 
dated 1979 - of Apple II+ vintage.  They're both in their original little boxes, 
and both put out by California Computer Systems.  One is an Arithmetic Processor 
AP-1, Mod.7811A.  (The HI BYTE and LO BYTE chip sockets are empty.)  I'm curious 
as to what advantages this board will provide to a 6502.  How much of a speed 
advantage would it provide?  The other CCS board is an Asynchronous Serial 
Interface, Mod.7710A.  There are 4 baud rate DIP switches on it (B0-B3).  What 
does 'asynchronous' mean for a serial interface?  How would this card differ from 
Apple's Super Serial Card?

Thanks for any help.

Jeff Lemke