Re: Amtech RF512C DOS: differences to 1571 ROM (was: Amtech RF512C manipulates reading the ROM image with M-R)

From: Mario Kienspergher <contact_at_kinzi.net>
Date: Wed, 6 Oct 2021 18:47:43 +0200
Message-ID: <eb67c5dd-efda-0805-1a7e-d0be584dc1d4_at_kinzi.net>
Great find ... :-)

Am 06.10.21 um 16:32 schrieb Spiro Trikaliotis:
> Thus, they did not only patch the drive to not read back the $FFxx area,
> they even did it in a very stupid way, patching out the checksum
> functions instead of fixing the checksum.
Well, the 157x checksum algorithm is somewhat ... special. :-)
I guess they were too lazy (not saying too stupid) to fix it.
> Did they really know what they were doing?
I'd say: YES.
They simply wanted to hide the fact they had used an exact copy of the 
1571 ROM in their device.
> Regards,
> Spiro
>
-kinzi
Received on 2021-10-06 19:00:02

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