From: Richard Erlacher <richard(a)idcomm.com>
 National made an extension on the 8048, i.e. the 8050,
and the 8035 in 
the
 form of an 8040.  It had 256 bytes of on-board RAM, but
otherwise pretty
well compatible with the Intel parts.  They pushed it pretty hard for a 
year
 or two. 
Signetics did the 8050 as well.
I know I have their manuals and 5 or 10 of the NSC8050s (pull EA and
you have romless usability.  I was NEC single chip product support
during those years.  So from about 76 to 85 I ahve a pretty good
collection of intel or intel compatable vendors docs.
Allison