Re: Alpha Electronics Dynamic Integrated Digital IC Tester on eBay

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@flippers.com>
To: <techtoolslist@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@flippers.com
>> <mailto:jrr@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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Received on Wed Jul 17 16:11:02 2013