From: utzoo!decvax!harpo!eagle!allegra!linus!genrad!grkermit!masscomp!tjt
Newsgroups: net.micro.68k
Title: Re: 68000 coprocessor card for Apple ][
Article-I.D.: masscomp.124
Posted: Sat May  7 08:03:21 1983
Received: Tue May 17 23:21:56 1983

Anticipating flames in response to my previous followup ...

The coprocessor board has its own memory which apparently is not
accessible over the Apple II bus (the article said the 68000 could
access the Apple II memory -- not vice versa).  This should make it
substantially easier to build sufficiently fast memory for a 12.5MHz
processor.  In particular, you can attach the memory more or less
directly to the 68000 without bothering with bus drivers, arbiters,
and the like.  You can even punt a memory controller and refresh the
RAM from software (a la SUN).

In summary, I COULD be wrong about the 12.5MHz processor not being
substantially faster than their 8MHz processor, but I would still be
surprised.

		Tom Teixeira
		Massachusetts Computer Corporation (MASSCOMP)
		...!decvax!genrad!masscom!tjt