Re: Copy II Plus would be illegal today

[mjmahon@aol.com (Michael J. Mahon)]

Matthew Russotto replied:

>In article <20011218153850.12961.00000863@mb-cu.aol.com>,
>Michael J. Mahon <mjmahon@aol.com> wrote:
>>Matthew Russotto wrote:
>>
>>>There were a few cards of this type.  Some even saved the contents of
>>>memory to their own on-board memory.
>>
>>Any card that wanted to capture _all_ of memory has to have some
>>on-board memory, since it's impossible to communicate with the
>>operator of the Apple without changing Apple memory in some way--
>>the screen memory comes immediately to mind.  And a number of
>>programs put critical code/data in screen memory while running just
>>to thwart simple IRQ attacks.
>
>IRQ?  Try NMI.

Right--slip of the finger.

>               My point was that some of the cards saved the
>contents of memory _entirely_ to their own on-board memory.

Interesting.  Never saw one of these.  Must have been quite
uncompetitive to have such a needlessly expensive design
when only a 2KB SRAM would have done the job perfectly.

-michael

 Email:  mjmahon@aol.com
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