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]. For more options, visit https://groups.google.com/d/optout.
