At 13:30 27/07/99 +0200, you wrote:

I used this chip in a eprom emulator sold though DIY (AKA kits'r'us) in Hong
kong. These chips were discontinued years ago and thus the lack of data
currently available.

My data source is the intel embedded controller handbook 1988. Other sources
are the cheap TAB microcontroller data books that you may fine collecting
dust somewhere. I seem to have several of these books covering these chips.

Here is a real hint. These parts are very similar to the 4042 keyboard
controller used in the early AT motherboards. You might have more luck
tracking down data on these chips. Also search for the TASM assembler or
other 8048 assembler. The manual may have some info I'm sure.

The thing I remember most about these chips was the short jump was page
orientated, (absolute 8-bit address to the current page, not relative)


Jim




>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
>
Regards,

Jim Robertson
NEWFOUND ELECTRONICS
________________________________________
Email: newfound@pipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.
________________________________________