Re: Looking for the elusive "Expanded VisiCalc v1.76a, for the Commodore 8096"

From: Tonguç Endem <calculathor_at_hotmail.com>
Date: Fri, 2 Mar 2018 13:17:27 -0700 (MST)
Message-ID: <1520021847976-0.post@n4.nabble.com>
found it :-)
Actually, I found it by accident while I was researching another software,
so that was great.
I'll provide a link soon.
There are some things I'm trying to figure out with the stuff I found.
It appears that back then, some of the most popular software used the
optional ROM for copy protection.
It also appears that a soft-rom / no-rom hack was being used to circumvent
this protection.
I think the hack uses bank switching on 8x96 devices and loads the rom data
from disk to $9000 location and the program works without an actual ROM chip
on the option slot since from the point of the program the rom data appears
where it's supposed to be.

Anyways, I'll provide more info when I discover more about this stuff.
 



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Received on 2018-03-02 22:00:03

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