Date   : Sun, 08 Aug 2010 23:33:12 +0100
From   : pete@... (Pete Turnbull)
Subject: Why did Acorn ADFS only allow 640KB on a floppy?

On 08/08/2010 19:08, Mike Tomlinson wrote:
> In article <4C53E12D.2020200@...>, Rick Murray <rick@...>
> writes
> 
>> PS: One of my old college friends was a hardcore Amiga fan... While I
>>     never really thought that highly of the machines, some of the
>>     add-ons were incredible. There was a box that plugged into the side
>>     with a button that, when pressed, would freeze the machine. You
>>     could snapshot memory, compare a snapshot with live, modify memory
>>     or registers... it was the closest I've seen to a full-blown
>>     emulation 'monitor' running on live hardware.
> 
> Very similar things were available for the Beeb and Spectrum.  Vine
> Micros's Replay for the Beeb and ?the Multiface for Spec.

Before that there was a device called a Snapshot card for an Apple ][ 
which would freeze the machine and save a memory image to disk, or 
reload one.  Made by Dark Star Systems, cost $109.95.  There were at 
least two other similar cards made by other companies around the same 
time (1981), at least one of which came with a memory editor program 
(the Crack-Shot, from the wonderfully named Pirates Harbor company). 
Meant purely for archival copies.  Honest.

-- 
Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York