11 Aug
2011
11 Aug
'11
5:08 p.m.
Looking back at the 8089 datasheet, I'm not
convinced that it
provides much for the money. ?In the minimum-component "local" mode,
it executes out of the 808x CPU memory space, being another contender
for that resource. ?At 5MHz with no contention/interleaving it can
transfer a byte every microsecond, best case--not much better than an
8237.
This is the main reason why the 8089 failed in the market. For what it
did, it was just too expensive.
--
Will