Build an 8-bit CPU from scratch

Re:Build an 8-bit CPU from scratch by duskwuff on Monday December 14, 2020 @08:01PM (#25425706)

Yikes. That's a remarked part -- the style of printing on the top is wrong, and the date code is nonsense. (0448 would indicate it was manufactured in late 2004, but Rockwell Semiconductor was spun off as Conexant in 1999, and they stopped manufacturing this part many years before that.)

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Re:Build an 8-bit CPU from scratch by Jedd on Monday December 14, 2020 @08:10PM (#25425787)

Oh, that's interesting (and way outside my knowledge bubble). You reckon it would actually work as a 6502, or it's remarked from an entirely not-65xx CPU?

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Re:Build an 8-bit CPU from scratch by segfaultbuserr on Monday December 14, 2020 @08:19PM (#25425847)

Both are possible. I guess there's a 70% chance that the chip is not a 6502 at all, nevertheless still a 30% chance that the chip is salvaged from trash and remarked but its silicon die is authentic.

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Re:Build an 8-bit CPU from scratch by duskwuff on Monday December 14, 2020 @08:18PM (#25425839)

There's a decent chance it's actually a 6502, but the actual part that's under those markings could be any one of a number of 6502s from many different manufacturers.

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