rzh@lll-lcc.llnl.gov (Roger Hanscom) (12/07/88)
In item <12169@cup.portal.com> Jeff_A_Scott@cup.portal.com writes: >I'm looking for a low-priced source of Motorola 68020 processors. >I just want one (and a 68881 co-processor) and I've looked in all the >common places (back pages of Byte, etc). Since this is a ~$300 purchase >the best price is important. Anyone know a cheap place? If you can lower your sights a little, a 10 MHz 68010 can be had rather cheaply -- say about $10 at computer shows, etc. Co-processors? You're on your own ..... probably big $$$.
dya@unccvax.UUCP (York David Anthony @ WKTD, Wilmington, NC) (12/07/88)
In article <2196@lll-lcc.llnl.gov>, rzh@lll-lcc.llnl.gov (Roger Hanscom) writes: > > In item <12169@cup.portal.com> Jeff_A_Scott@cup.portal.com > writes: > > >I'm looking for a low-priced source of Motorola 68020 processors. > >I just want one (and a 68881 co-processor) and I've looked in all the > >common places (back pages of Byte, etc). Since this is a ~$300 purchase > >the best price is important. Anyone know a cheap place? If you are on good terms with your local Schweber or Hamilton-Avnet rep (or other Motorola distributor) they should be able to secure a 12.0 mHz processor in the $80-$120 range. They are jellybean parts now. (I think I paid $135 for MC68020RC12 last summer, which is still awaiting the breadboard!). For the coprocessor, you are on your own. Try and get prime parts, anyway. I can't believe that most of the junk in the back of consumer fishwrappers were obtained from legitimate sources. (We've bought some, er, grey-market RAM chips from ads in magazines (they take MC &Visa, hey, what can I say) and while they meet the speed spec, they usually do not meet the speed at power dissipation spec.) 68008's from a **well known** mail order place (Mostek brand) have an off-spec failure of about 1 part in 25. DUARTS (MC68681) were even **worse**. If at all possible, get prime parts. Saving money on off-spec devices, fallouts, cull-outs, call 'em what you will, is false economy. York David ANthony WKTD Wilmington, NC
neals@tekigm2.TEK.COM (Neal Sedell) (12/13/88)
Y.D.AN. writes: > If you are on good terms with your local Schweber or Hamilton-Avnet >rep (or other Motorola distributor) they should be able to secure a 12.0 >mHz processor in the $80-$120 range. - and then he says - > If at all possible, get prime parts. Saving money on off-spec >devices, fallouts, cull-outs, call 'em what you will, is false economy. > Gee, if the 68020RC12 wasn't an off-spec part it would run at a maximum clock freq of 12.5MHz, not 12.0... Same thing for the 'RC16 - max clock is 16.7MHz (actually the minimum clock period is 60ns....) Seriously, watch out for the minimum frequency too - it's 8MHz for both the '12 and the '16. Good luck finding a cheap co-processor - supply/demand/production volume/ yield/etc. isn't on the consumer's side at this point. -- Neal Sedell