12 Nov
2003
12 Nov
'03
11:46 a.m.
"Dwight K. Elvey" <dwight.elvey(a)amd.com> wrote:
I always thought the 6800 was the best thought out
instruction set for a 8 bitter.
It was pretty good. A bit weak on addressing modes. The 6502
had better addressing modes (especially the indirected indexed by Y
mode), but was somewhat hamstrung by the single accumulator and only
256 bytes of stack.
Once the 6809 was introduced, the question of best instruction set for
an 8-bit microprocessor was definitively answered. (At least until the
Hitachi 63C09, which is a CMOS 6809 with various improvements and
extensions.)