Dumping an Intel D8749?

allison ajp166 at verizon.net
Sat Oct 2 07:33:14 CDT 2010

On 10/01/2010 11:08 PM, Josh Dersch wrote:
>  Short story:  Anyone have the ability to dump an Intel D8749 
> microcontroller's internal EEPROM for me?
> Long story:  I picked up a neat-o keen display unit.  (See 
> http://yahozna.dyndns.org/scratch/avtron/IMG_0477.JPG for a picture) 
> It uses two *huge* Panaplex displays (Babcock SP-431's) showing 4 
> 7-segment digits (with 2" digit height) each.
> It's made by Avtron, an industrial automation hardware company -- I 
> got in touch with their support department and they helped me identify 
> the display (it's a "K885 Extrabrite display" designed to be used with 
> their K885 "Speed / Draw" systems).  Alas, they can't provide any 
> interface specifications (which is about what I expected), so all I 
> know is that it uses some sort of two-pin serial interface (with 
> connectors labeled "High" and "Low")
> I was thinking that if I could get a dump of the microcontroller ROM, 
> I might be able to either (a) decipher the protocol enough to allow 
> another microcontroller/PC to control the display, or (b) decipher the 
> hardware enough to figure out how to write a replacement EEPROM for 
> the onboard microcontroller... I think this thing would make a 
> *really* cool clock...
> - Josh
I'm too far away.   However if you find a copy of the 8048/49 Intel 
books the procedure for dumping the
Eprom is trivial though its 2048 bytes in size by 8bits.  Once you have 
the content I rember somewhere
on the net seeing a decent disassembler.


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