Re: [N8VEM-S100:4418] Re: v20-16, z80-20 and chip counterfeits

For US folks, I just purchased the WD37C65 for my ECB SBC-188 from Quest Components. I also ordered some NEC 7220s and the BT RAMDAC chips that go with them for a future build of the ECB (and maybe the new S-100) upD7220 boards.

I'm in California and the parts showed up the next day, perfectly packed, exactly what I ordered.

They have some 20 Mhz Z80s too.

I think there is a minimum order which is why I combined and ordered a few things at once.

I also noticed they have the chips for the 286 board including some of the 12 mhz bus chips that John mentioned in his write-up he was trying to locate.

Always nice to deal with a US company.

Andrew B

On Saturday, June 28, 2014 10:16:16 PM UTC-7, David Fry 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

http://uk.mouser.com/Search/Refine.aspx?Keyword=z84c0020

regards

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?

--curt

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