[Coco] Ebay IC's quality

[Luis Antoniosi (CoCoDemus)]

Those chips from Russia were all communists from soviet era. Half work
and half not...

On Wed, Feb 12, 2014 at 10:20 AM, Mark Marlette
<mmarlette at frontiernet.net> wrote:
> Luis,
>
> Not just Ebay....
>
> I procured 300-400 HD63C09EPs from Russia several years ago. Almost a 50% failure rate. Not a big deal as I picked them up cheap.
>
> Time before that I picked up 100 or so HD63c09eps at x4 the cost. All worked fine. This to was an overseas purchase.
>
> I test every uP sold at C-9 to verify that they are functional. The case is always a no boot, dead, black screen on CoCo.
>
> Thus the higher price.
>
>
> Regards,
>
> Mark
> http://www.cloud9tech.com
>
>
> ________________________________
>  From: Luis Antoniosi (CoCoDemus) <retrocanada76 at gmail.com>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Wednesday, February 12, 2014 8:02 AM
> Subject: [Coco] Ebay IC's quality
>
>
> Hi people,
>
> It's not the first time I had problems with scrap IC's sold on ebay.
>
> My first problem appeared with commodore 64 SID chips. A lot of 10
> chips only 5 weren't completely dead and among those 5 none of them
> were perfect. Some had one blown channel or bad filters.
>
> Yeterday debugging my new wordpak2+ card I found a short circuit on
> dram lines: RAS and AD7. I tested all connections, removed 9958,
> removed all DRAMs and I found a bad 4464 DRAM with short circuit. Then
> I replaced it for another dram from same lot (bought on ebay) and
> bang: other 2 pins were shorted too.
>
> Then talking to Daniel I found that the VDPs I just bought are not in
> fact V9958s but a V9938s. There weren't V9958 in 1984. These chip were
> rebranded:
>
> http://www.ebay.com/itm/261031498657?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
>
> Ebay is a scrap and fake IC's paradise. Take care when buying cheap IC's
>
> --
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>
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