Author Topic: NVRAM Micro 400 Battery Tester  (Read 834 times)

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Offline Quarlo Klobrigney

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NVRAM Micro 400 Battery Tester
« on: September 12, 2018, 08:30:29 pm »
This battery tester was given to me to replace the LCD. That I did, without any problems. However, the display is gibberish (including several Neptune tridents) no matter which LCD is installed (standard Hitachi).

All LCD modules (16x2) check good in a tester.

I removed the "protective" epoxy brush painted on all the IC's.
The ┬ÁP is a 68HC705, and from what I see, it is loading garbage from the NVRAM, ID unknown, with a battery long ago dead (mfg. 1996). No support is available.

After I removed the NVRAM, the 68HC705 loads nothing, (blank screen).
Obviously the boot code was in there....

So my question is this,
1) Has anyone seen this tester?
2) Is there any way to dump it regardless of battery?
3) Did anyone ever dump their own NVRAM from this thing?

Purely sentimental value for this person. Any help would be welcome.
Voltage does not flow, nor does it go.
 

Offline Quarlo Klobrigney

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Re: NVRAM Micro 400 Battery Tester
« Reply #1 on: September 12, 2018, 10:17:28 pm »
De-encapsulation complete...No data, no battery voltage (.3V) Dead Dead Dead. The battery voltage can also be measured from pin 7 VBAT to 4 GND on the DS1218. Still Dead :horse:

 :scared: Now is the time to backup all those NVRAMs before it's too late. Tektronix calibrations come to mind....
« Last Edit: September 13, 2018, 02:19:38 pm by Quarlo Klobrigney »
Voltage does not flow, nor does it go.
 

Offline CJay

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Re: NVRAM Micro 400 Battery Tester
« Reply #2 on: September 13, 2018, 11:34:50 am »
Well that's a bit crap...

FWIW, the DS12xx battery backed RAMs can usually be read like an EPROM, it'd be worth tracking down someone who has another one of those battery testers and explaining the problem to them before offering to 'back up' their device to make it safe.

I'd suggest putting in an EPROM but I have a feeling the NVRAM is used to store calibration data aws well as boot code.
 

Offline Quarlo Klobrigney

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Re: NVRAM Micro 400 Battery Tester
« Reply #3 on: September 13, 2018, 02:23:08 pm »
Now with NEW PIX! :popcorn:
Voltage does not flow, nor does it go.
 

Offline ogden

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Re: NVRAM Micro 400 Battery Tester
« Reply #4 on: September 13, 2018, 02:45:03 pm »
If NVRAM is dead then most likely it's end of the story. Usual buyers of such tool do not even know what NVRAM is.

Purely sentimental value for this person. Any help would be welcome.

Suggest him to put that thing into display box with neat LED lights. Some ideas: http://newmediologo.me/doll-display-case/
« Last Edit: September 13, 2018, 02:46:41 pm by ogden »
 


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