How security holes happen

MRAB python at mrabarnett.plus.com
Fri Mar 7 03:13:02 CET 2014


On 2014-03-07 01:53, Mark H. Harris wrote:
> On Thursday, March 6, 2014 6:28:58 PM UTC-6, Dennis Lee Bieber wrote:
>>
>> 	The 6502 was NOT a Motorola chip (they had the 6800).  The 6502 was MOS
>
> That's funny... did you not see what I wrote back to MRAB?   Here:
>
> The MOS 6502 is to the Motorola 6800 what the Zilog Z80 was to the Intel 8080.
>
Not quite.

The Z80's architecture and instruction set is a superset of that of the
8080; the 6502's architecture and instruction set isn't a superset of,
or even compatible with, that of the 6800 (although it can use the same
I/O, etc, chips).

>      The same engineers who designed the 6800 moved out and then designed
> the 6502; actually ended up in a law suit of sorts--- but I don't remember the
> details. Anyway, the 6502 was bought outright by Commodore, and the rest
> is history with the VIC20.
>




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