Originally Posted by seanriddle
When I was putting together info on the PPS-4/1 variants, I ran across part # B90xx in the 1981 Rockwell Electronic Devices Division Data Book, which says that's model MM78LA. There's very little info beyond an entry in a comparison chart, but that leads me to believe that it uses the same opcodes as the MM78.

Definitely very little info online besides that book. There's two pages in "Microprocessor Data Book" (S. A. Money)

One page in "Microprocessor and Microcomputer Data Digest": https://books.google.com/books?id=WxUjAAAAMAAJ&q=MM78LA&dq=MM78LA

and one table in a page in this issue of Electronic Design: https://books.google.com/books?id=KuAEAQAAIAAJ&q=MM78LA&dq=MM78LA

You can get a few more summaries this way: https://www.google.com/search?q=%22MM78LA%22&num=100&safe=off&tbm=bks

And these guys digging around in 2004: http://ana-3.lcs.mit.edu/~jnc/cctalk/2004-July/1584.html

But that's all that's leaping out at me... </masteroftheobvious>