[Techtoolslist] Alpha Electronics Dynamic Integrated Digital IC Tester on eBay

[Fabrizio Vasile]

Does someone  tell me more about this piece of equpment?Thanks.

http://www.ebay.it/itm/Tektronix-851-BDM-1250-Portable-Digital-Tester-Test-Set-/380061776492


----- Original Message ----- 
From: "John Robertson" <jrr at flippers.com>
To: <techtoolslist at flippers.com>
Sent: Wednesday, July 17, 2013 1:51 AM
Subject: Re: [Techtoolslist] Alpha Electronics Dynamic Integrated Digital IC 
Tester on eBay



> It works????

>

> Cool!

>

> This is a CMOS battery backed up RAM - it should be able to be read by a 

> good eprom burner as a 27256. Heck read it as a 27512 to be absolutely 

> sure of getting the correct memory size - it will just mirror the data if 

> it is smaller.

>

> The battery is under the cover on the thick IC with the warning label on 

> it. Do NOT remove the battery until you are sure you have valid data. The 

> way to be sure is to send me the file and I'll drop it in one of my chips 

> and test my unit.

>

> John :-#)#

>

>

> On 07/16/2013 4:26 PM, Default wrote:

>> Hi Group,

>> I couldn't help myself.  I figured at $19.95, this would be a cool little 

>> device to have even if it doesn't work.

>> Get it in the mail, read the documentation that came with it and couldn't 

>> find a battery.  Hmm, that's odd.  But there is a power jack.  And 

>> everything looks brand new, not even dust!

>> Pop it open, no battery but a funny thing what looks like to be a RAM 

>> stacked on something else, a few custon chips, etc.  No standard EPROMs 

>> that I could dump, bummer.

>> kids are in bed, back to the schematic and it'll take between 9 and 

>> 12VAC.  Looked through my wall wart collection and found a 12VAC one.

>> Wired it up, hit the switch and...

>> COMMAND? scrolling across the screen!  Figure i'll let it run for a  half 

>> hour if there is a battery somewhere and it needs to be charged.

>> My question to the group is, how do I dump the program on this thing?

>> Thanks

>>

>>

>> On Tue, Jul 9, 2013 at 3:46 PM, John Robertson <jrr at flippers.com 

>> <mailto:jrr at flippers.com>> wrote:

>>

>>     I chatted with the seller and he confirms that it does NOT power

>>     up. So chances are the battery backed up system ROM has failed.

>>

>>     Item 390623172259

>>

>>     He reduced the price on his own from the original asking $59.95 to

>>     $19.95.

>>

>>     Pity. I was hoping to find a good one to extract the program from

>>     to save mine...

>>

>>     If someone here buys it and CAN extract the ROM data I'd sure like

>>     a copy!

>>

>>     John :-#(#

>>

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>>

>>

>

>

> -- 

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