One part is that I'm looking for is a few z280-12's, and the only source I have found is china, with ludicrous date codes like 0523, etc. I've got exactly one z280-10, and i got that as a sample direct from zilog, so I've got a gold standard to test against. When did crooked get so mainstream?
On Saturday, June 28, 2014 8:49:10 PM UTC-7, Gary Kaufman wrote: > > Curt - > > I purchased two Z84C0020PEC's that were also questionable. One was dead, > one runs ok at 8mhz (I haven't tried faster clock speeds yet). They had > identical top printing and date codes, but the molding marks on the bottom > were different. The dead chip was replaced without question with one that > also works fine at 8mhz. > > Also a recent batch of TIL311's were used pulls (advertised as new) and > 3/10 were dead in whole or part. They had shortened tinned leads and > obvious signs of removal. > > I could write pages about counterfeit capacitors - my primary hobby is > vacuum tube audio gear. My experience is that 100% of Chinese capacitors > are faked. > > If Mouser or Digikey carries the parts it's worth the extra cost! > > - Gary > > On 6/28/2014 10:44 PM, 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.
