[Coco] Ebay IC's quality

[Mark Marlette]

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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Long live the CoCo

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