[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [N8VEM-S100:4417] Re: v20-16, z80-20 and chip counterfeits

Hi David,
eBay seller acpsurplus has Western Digital WD2793s and some SAB2793s which are a Siemens version according to the listing. He is a California based seller and every device I have purchased from him has been genuine old stock. I have no connections to acpsurplus, just a satisfied customer.

On Sun, Jun 29, 2014 at 2:46 PM, David Fry <dgf...@googlemail.com> wrote:
Hi all,
does anyone know a reliable source for a WD2793 floppy controller ic, I have been looking on ebay and am also concerned that many of the TMS2793 look suspicious, too many suppliers with identically printed/date coded chips. I can believe that there is a large stash of these parts in China.
the whole fake IC this is very frustrating, I buy from reputable suppliers where possible but many of these chips are obsolete/not stocked.
wrt 20mhz Z80 CPU , Mouser has 119 DIP's on order with an estimated delivery of 3/10/2014 for those who can wait
David Fry

On Sunday, June 29, 2014 3:44:02 AM UTC+1, curt mayer wrote:
I've got a 8088 cpu blank, and a z80 cpu populated.   I bought a 10 chip lot of z84c0002pec's from ebay, and was a bit horrified when I got them to find
that they smelled of new paint.  identical fronts, but the backs showed different countries (indonesia and phillipines), all with different mold imprints.

obviously shenanigans. 

so, I wired up a 20mhz test rig for the z80's, using a derivative of dunfield's no-ram monitor (i disassembled it and added a lot more code), and not a one tested
out at 20 mhz.  one limped at 16, 2 ran at 12, and the rest were good at 8.  all tested as cmos: the out (C),F instruction sends FF, the nmos sends 00.

for 15 bucks, I got a bunch of mildly useful z80s of unknown actual characteristics.

anyhow, now i want to build the 8088 board with V20's - NEC has a part number for dip-40's at 16mhz.  70108hcz-16.  lots of them available on ebay from china.

any experiences here before I become the ebay counterfeit chip crash test dummy?


You received this message because you are subscribed to the Google Groups "N8VEM-S100" group.
To unsubscribe from this group and stop receiving emails from it, send an email to n8vem-s100+...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.