Go to http://www.xs4all.nl/~ganswijk/chipdir/fam/8051/8048.htm

Unfortunately all the pages of the datasheet are stored as gifs, so it's a
bit slooowww.

The 8748 is the eprom version of the 8048.  Both were the predecessors of
the 8051 and the instruction set is very simmilar.  Somewher I even have an
assembler for the 8048, although I scrounged it from somewhere on the net so
it's probably still around.

I found this on Altavista BTW ;o)

Mike Rigby-Jones

> -----Original Message-----
> From: Caisson [SMTP:caisson@TELEBYTE.NL]
> Sent: Tuesday, July 27, 1999 12:30 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Micro-controller NEC D8749HD (8048 family) - Info anyone ?
>
> Hello All,
>
>   I've got a device at home with a 8748 Micro-controller on it, from which
> I would like to know what it's instruction-set is (An EPROM is sitting
> close by).  The controller is used to drive a one-line character-tube of
> about 60 char.  It was used in an old electronic Type-writer.
>
> But I can't seem to find any decent documentation about the thing.  I've
> found a descriptions of it's pin's , but nothing more.  I've visited the
> NEC & INTEL sites, but their search engines came up with nothing, or next
> to nothing :-((  Standard Search-engines (AltaVista, Yahoo) came up with
> numerous hits, but not with regards to a micro-controller :-)
>
> Someone knows where to find more about the beast ?  Pretty please :-)
>
> Greetz,
>   Rudy Wieser