How to read code from P87C750?

[Martin Riddle]

Obsolete data controller from defunct company uses this Philips
ucontroller.
Units are failing and customer has the option of either throwing out
all his
infrastructure when these units fail and spending $$$$ to replace
everything,
or burning new controller ICs as units fail.

<http://www.datasheetcatalog.org/datasheet/philips/P87C750EBPN.pdf>

It looks like the P87C750 comes with a 16-byte encryption table,
optionally
used to encrypt the contents of program memory.

The only way, it seems, to know if the memory contents has been
encrypted is
to read the contents and see if it contains legible code.

Is there another means to know if the memory contents have been
encrypted?

Thanks.

Gary, I have a DS-750 dev kit from Ceibo. It has 2 87C750's
<http://ceibo.com/eng/pdf/ds750.pdf>
Its dos or win98 based. It will read or write the devices.
If you want to give it a shot let me know.

Cheers

 

[Gary Walters]

How can I email you directly ?

notax2day at the popular "Y" service.

Thanks.

 

[Robert Baer]

Obsolete data controller from defunct company uses this Philips ucontroller.
Units are failing and customer has the option of either throwing out all his
infrastructure when these units fail and spending $$$$ to replace everything,
or burning new controller ICs as units fail.

<http://www.datasheetcatalog.org/datasheet/philips/P87C750EBPN.pdf>

It looks like the P87C750 comes with a 16-byte encryption table, optionally
used to encrypt the contents of program memory.

The only way, it seems, to know if the memory contents has been encrypted is
to read the contents and see if it contains legible code.

Is there another means to know if the memory contents have been encrypted?

Thanks.

I think i have a complete programming kit which has all manuals.
I also have a bunch of the P87C750s.
If you want all of that, let me know and i will dig it up and send to
"first come first served" - just pay reasonable estimate for shipping.

 

[josephkk]

What was really the worst uP architecture? That RCA 17xx thing?

My vote is for the Fairchild 3850.

?-)

 

[stratus46]

"The Philips 8XC750 offers the advantages of the 80C51
architecture..."

ADVANTAGES of the 8051 architecture???!!!

--

John Larkin         Highland Technology, Inc

jlarkin at highlandtechnology dot comhttp://www.highlandtechnology.com

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom laser drivers and controllers
Photonics and fiberoptic TTL data links
VME thermocouple, LVDT, synchro   acquisition and simulation

Well if ALL you know is MCS-51, then it would be an advantage. I've
written lots of MIDI code in MCS-51 and it's a clunky architecture. I
just get the impression that some of the instructions were added as
'Oh, Yeah'.

Does the op know if security is set? Tektronix used 8751s as the
controllers in the 17xx series broadcast video scopes. The 'security
bit' wasn't set so we just copied from a good scope to repair the
broken ones. Good old JDR Microdevices EMUP programmer. Still got it
with a pentiun 166.

G²