I've had really good luck with Quest Components out here in California. I bought the FDC chip for my ECB SBC-188 from them, and 10 each uPD7220 and the BT478 chips to go with them. Everything came very well packaged (desiccant even) and quickly.
I looked at some of the 286/386 board support chips and they had them so when I get to those boards that is where I will order from. Andrew B On Friday, August 15, 2014 2:07:03 PM UTC-7, Crustyomo wrote: > > Gary, > > Thanks for those names, I've added them to my own private "Black list" > > Regards, > Josh > > > ------------------------------ > Date: Fri, 15 Aug 2014 15:21:35 -0400 > From: [email protected] <javascript:> > To: [email protected] <javascript:> > Subject: Re: [N8VEM-S100:4934] Fake 65C02 > > Welcome to the counterfeit club. I could make a mosaic with fake Z80's. > > Who was the vendor/seller? > > My experiences include: > > adeleparts2010 - purchased 10 pc TIL311 - used parts, obviously desoldered > and some damaged > - no relationship to the parts in the picture. > > allpartspipe2008 - Z84C0020PEC 20mhz CMOS Z80's are all counterfeit - and > poorly done. > > - Gary > > On 8/15/2014 3:14 PM, Rich Leary wrote: > > I purchased some 65C02's on eBay in June to use on my V1 6502 CPU board. > While my wire-wrap CPU board used a 'C02' (GTE 65SC102-2 to be a little > more definitive) I had never written any code that used the 'C02' added > opcodes, addressing modes, or other features. My DOS/65 code uses strictly > NMOS 6502 opcodes etc. > > I wrote a short utility that used BRA instead of JMPs and in one spot > used an INC A opcode. The utility would not work leading me to question > whether I had the residual brain cells to have fun with computers. I > changed the code to remove any 'C02' opcodes etc. and the utility worked > fine. I was now suspicious. > > I then used the few lines of code that perform BCD arithmetic as the > NMOS 6502s do not correctly handle the flags when doing BCD arithmetic. The > CMOS versions do correctly set the flags. This test clearly indicated that > what was labeled a 65C02 (specifics in a minute) was not a 65C02 but was an > NMOS 6502. > > Bottom line - the ICs appear to be intentionally mislabeled. So if you > see an eBay add for a 65C02 with the following lines and with the Rockwell > logo to the right of the first three lines be careful. > > R65C02P4 > 11450-13 > MEXICO > 0815 S11468-4 > > I did a quick eBay check and more than seller in China had IC pictures > with this marking. Some may be correct but I suspect many are not. > > By the way, when I pulled the new 6502 V1 board and put my 30+ year old > wire wrap board in my system to run the same tests on the GTE IC, it > refused to start. I guess I really do need the V1 6502 CPU! > > Rich Leary > -- > 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] <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.
