So a few months ago I was looking on eBay for cheap wafers for decoration for my room, and there was one seller which had some wafers marked with "1145X".

By looking at the pictures, the chip looked awfully familiar to the MOS 6502, specially the huge PLA, but not quite the same. So a friend and I ...

They're not 6502s but I ordered a bunch of Altera EPM7128's off ebay and none of them work at all.
Top-left is one I bought from a local reseller before they went obsolete (this one works), all the other ones are from ebay & are not detected by the programming cable. they could be pulls from some ...

@socram, I think it would be best to double check your conclusion, just in case something else is causing your program to fail. How about trying the following? This should loop even on an NMOS CPU.

cheers
Jeff
start:
CLC
BCC start
BRK
START
A:0007 D:EA R
A:8007 D:00 R SYNC
A:8007 D:00 R
A ...

Otherwise these come from a parallel universe in which Rockwell still exist in 2014 :D
Do they work and are they CMOS?
Apparently, they do work but they are not CMOS:
A:8001 D:00 R
A:0001 D:FE R SYNC
A:0001 D:FE R
A:0002 D:00 R
A:0001 D:FE R
A:0000 D:80 R
A:FFFC D:00 R
A:FFFD D:00 R
A:0000 D:80 ...

Otherwise these come from a parallel universe in which Rockwell still exist in 2014 :D
Do they work and are they CMOS?
I tested these with the tester I had made for the other fake 65C02s I had received , but that's before I found out I had the data pins wired backwards, and the only thing I am ...

Might it be true that chips advertised as Rockwells are unlikely to be counterfeit, simply because they have a lower market value? I'm only speculating. But if I saw chips on EBay advertised as being 14 MHz WDC parts I'd be more suspicious.
I am well aware that Rockwell can be counterfeit as well ...

Query: How does one determine if the R65C02 you receive is a counterfeit?

The reason I ask is that I bought 4 R65C02P4 units off an eBay vendor in Hon Kong not long ago and they work perfectly.
You may want to build a simple Arduino tester like the one I made for the W65C02s I received from China ...

I'm looking forward getting at least two old, NOS R65C02 processors, at any speed. After having tried to get them on eBay and ending with a bunch of counterfeits, I'd rather get them somewhere else even if they're pricier. Could anybody suggest a thrustworthy place to get them?

It's not for a ...

Well, thank you everyone. I've just found a picture of the underside of a CMD G65SCxxx chip and can say for sure these are CMD chips.

The circles on the top are exactly the same in the CMD chips I've seen. The notch on the top, and the circle marking pin 1 are also identic on mine

On the underside ...

Yes yes, I am aware that this is certainly not a WDC product. I am at this point just interested for sake of science in guessing which CPUs I had here.

The resistance between GND on pin 21 and pin 1 is in the order of 10 ohms, so I am pretty sure they are tied together, which would be the case if ...

Might be worth checking for the presence of BBR/BBS (opcode 0x7) and RMB/SMB (opcode xF). The G65SC12 doesn't have these.
Apparently it doesn't have them - they're treated as a one-cycle NOP as seen in the log on my previous after I edited it.

I'll see if I can decap them, and look at their ...

I thus got an Arduino, clocked it manually while probing on key pins Can you clarify what you mean by clocking it manually? Just a reminder: NMOS 65xx CPU's have a spec for maximum cycle time -- IOW, minimum operating frequency. The published spec is very conservative, but nevertheless there's a ...

Well, this is my first post, so hello everybody.

I've wanted for a very long time to build my own tiny computer from scratch, and after a friend told me he was doing one himself, I began actually designing mine.

My idea was a 6502-based design, at the highest speed I could run it reliably, so I ...