Dumping an Intel D8749?
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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