Re: If you could design a $300 homecomputer today, what would you choose?

[Bob Retelle <bobr1@provide.net>]

On Wed, 18 Jul 2001 23:44:48 GMT, "Timothy A. Seufert"
<tas@mindspring.com> wrote:

>In article <559alto1n92ebbrfjug42gj4pidregesfi@4ax.com>, Bob Retelle 
><bobr1@provide.net> wrote:
>
.
>> 
>> The 68000 requires an external MMU, taking up more real estate on the
>> motherboard and adding cost to the basic cost of the CPU.
>
>The 68020 requires an external MMU (68851), which doesn't appear to be 
>in production anyways.  (From Motorola's standpoint, that makes all kind 
>of sense; customers which want an MMU and similar performance can just 
>buy an 030).
>
>The 68000 cannot use one at all.
>
That's interesting-   the MMU in my Atari ST (68000) was one of the
fairly easy "hack" points where you could physically attach memory
expansion cards, since all the address lines were available.

I don't know if Atari used an "off the shelf" Motorola part though.

The reason the ST was limited to 4Mb of RAM was that the MMU only had
enough address lines for a max of 4Mb.

(Atari folks loved to poke fun at PC folks and their "640K" limit-
right up until they tried to put more than 4Mb in their STs.  Same
situation-  the company "knows best".)

>
>-- Tim
>To mail me unsolicited advertisements:  Move to Siberia.  Wait until I
>say it's OK to send.  Everybody else, remove "NOSPAM" from my address.

BpbR