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 >> > -- 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.
