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near | 5 years ago

On a related note, I had always wished we at least got a complete PDF specification for the unreleased 65832, a 32-bit 6502 core. I'd love to implement it just for the novelty, even if nothing used it. http://www.mirkosoft.sk/65832.html

discuss

codetrotter|5 years ago

This made me wonder if anyone had designed a 64-but 6502. Came across this http://www.6502.org/users/andre/adv65/index.html which in turn links to many different things including a project that they had started on with making a 64-bit extension to 6502 for fun.

JdeBP|5 years ago

There is too much TimeCube on that WWW site. Try this one.

* https://retrocomputing.stackexchange.com/questions/14864/wha...

ndiddy|5 years ago

From skimming the datasheet, it looks like a fairly bad product. Sure the A register is extended to 32 bits, but the 8 bit data bus means that it's not going to be much faster than the 65816 and the address bus is still 24 bits. I have no clue why WDC decided to keep the same pinout as the 65816.

near|5 years ago

Oh, it even has a datasheet! Thanks, that's amazing! The missing SEV instruction could have been aliased to SEP #$40. The only thing missing to produce a working replica today (in hardware or software, just for fun of course,) was indeed the XFE designation. The only place it could have gone was in the WDM prefix, but it could have been any byte after that. We would have to outright guess. He couldn't have reused XCE for it without risking perfect backward-compatibility (though of course he may have decided to do that anyway.)