reading static ram

[dwalt]

I've been trying to hunt down the locations for the installer codes and user codes on the OmniPro II.
There are three socketed static ram chips on the board. Two are 28C256 chips which my eprom programmer can read.
The codes are not there. There also is a Samsung K6T4008C1C-DB70 which is a 512Kx8 bit Low Power CMOS Static RAM.
My eprom programmer (GQ-4x4) can't read this static ram. I suspect the codes are there. Does anyone have a device that can read this chip?
dwalt

 

[RAL]

The K6T4008C1C-DB70 is a static RAM memory, not a non-volatile RAM. A static RAM loses its data the moment power is removed, while a NV-RAM will retain the data. So the installer code would not be stored here.

I'm not an expert on the OmniPro II, but my guess is that the installer code is most likely in the 28C256 somewhere, perhaps in encrypted form.

 

[dwalt]

Thanks for that explanation. I will look some more,

 

[amos]

You could change the installer code a few times and dump the eeproms after each change. Compare the dumps.

You might want to check all the chips on the board and see if there's any other nvram types where secure stuff might be stashed.

 

[dwalt]

Yes, I did a diff on the static rams after changing codes. No changes to the static rams.

 

[amos]

How do I reset master code for Omni Pro II ?

You still need the encryption code to log in. Do you really want a security system that is that easy to break into???

cocoontech.com

post 39

 

[dwalt]

How do I reset master code for Omni Pro II ?

You still need the encryption code to log in. Do you really want a security system that is that easy to break into???

cocoontech.com

post 39

Thanks, I looked there originally.