Hi Ian, many thanks, I have now ordered some parts from ACP surplus via ebay cart system. Quest components looked like a good source until I got to checkout and they wanted $50 to ship a few chips USPS to UK ( I dont think so....) regards David Fry On Sunday, June 29, 2014 4:09:19 PM UTC+1, Ian May wrote:
> 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. > Cheers, > Ian. > > > On Sun, Jun 29, 2014 at 2:46 PM, David Fry <[email protected] > <javascript:>> 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 >>> >> -- >> 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 [email protected] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
