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MOS Technology Ceramic 6502 for sale on ebay

That is the less rare version of the ceramic 6502 used on the later NTI Apple-1. This version usually goes for around 1k to 1.5k depending on condition. The rarer one that was used on the early Byte Shop Apple-1 tend to go for around 2k plus. It's a different ceramic package.

Forgetting the Apple-1. Ceramic 6502, especially the ones with the RoR bug are very valuable to chip collectors.

Cheers,
Corey
 
What is the cutoff week in 1976? or maybe they made the chips with the gold trace across the cover while still also putting out the "trace-less" version. what is more important to apple collectors, newer but no trace or older with trace? i.e a late 1976 without the trace vs. a mid 1976 with the trace.

b
 
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If you are the buyer who paid $213,600 in 2010 at a Christie's auction (SALE 7882 LOT 65) for an Apple 1 with a 1981 Rockwell chip, you definitely need this IC to increase the value of your purchase and just to make it look right.
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Nah, it's OK - I'm happy with the Rockwell chip. It still works :p
 
GeoNomad said:
Any idea what an early one with the ROR bug might be worth?

Should I put mine in a safe deposit box? :p

Any offers? PM me...
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If your date code is around sept 1975, the last one I saw sell in good condition was 2.5k on eBay. I know of one that sold for 4K privately but that one was in great condition.
 
Corey986 said:
If your date code is around sept 1975, the last one I saw sell in good condition was 2.5k on eBay. I know of one that sold for 4K privately but that one was in great condition.
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Mine is not pristine as the ceramic is cracked on a corner from when I pried it off the board to replace it with a new one after they fixed the ROR. I was not used to desoldering big chips like that back then and the tools were a soldering gun and a screwdriver to pry it out.

Still, it is a nice souvenir.
 
GeoNomad said:
Mine is not pristine as the ceramic is cracked on a corner from when I pried it off the board to replace it with a new one after they fixed the ROR. I was not used to desoldering big chips like that back then and the tools were a soldering gun and a screwdriver to pry it out.

Still, it is a nice souvenir.
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And that is the reason a good example can cost so much. It's like comic books. I could get an Action Comics #1 in poor condition for 100,000 or near mint for more than 3 million. Kind of a big range.

Still a chipped RoR 6502 is worth more than one missing a leg, so I'd guess, and this is just a guess, it's worth about 1k.
 
I could look this up, but I assume there is a test that one can run to determine if they have the ROR bug, correct? Could you slip one of these into an Apple II, or how to people check to see if they have Wonka's Golden TIcket?
 
billdeg said:
I could look this up, but I assume there is a test that one can run to determine if they have the ROR bug, correct? Could you slip one of these into an Apple II, or how to people check to see if they have Wonka's Golden TIcket?
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You can test it in a system that doesn't use the ROR instruction as part of what you are running. The Kim-1 ROM doesn't use ROR because it didn't exist when programmed. I doubt they updated the ROM after they fixed the chip. So, to test for ROR, just enter the appropriate code into the hex keyboard to load a value, ROR it, and display the result.

It is hard to guess whether the Apple ][ uses ROR in the main code. It might, as the new 6502s were shipping while it was being developed. If it does, then you won't have a display to test with as it will probably crash. I don't remember what happened if you tried to execute an ROR on a faulty chip. HALT and catch fire, or just do some other bit manipulation (more likely). Lots of undocumented opcodes in the early 6502 did things that were potentially useful if you wanted to save space.
 
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