'Disk Preservation Updates Thread'
Author:System (guest: search)
Date: Mon, Jan 30th, 2012 @ 04:02 ( . )

C64 Disk Preservation Updates for Mon, 30 Jan 12 04:02:01 -0500

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Title: SimCity (PAL) (v1.1)
Publisher: Maxis
Year: 1989
Protection: checks signature on track 16 (?)
Contributor: dc, hedning
Notes: cifo
Verified: 1
Last Modified: 2012-01-29 20:12:16
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Title: Rocky Horror Show
Publisher: Electric Dreams / CRL
Year: 1984
Protection: none
Contributor: lyons, jerry, quapil
Notes: cifo - my original says CRL, Jerry's says Electric Dreams? Identical sectors. alt is different version from Europe
Verified: 0
Last Modified: 2012-01-29 20:26:55
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Title: Rocky Horror Show (C128)
Publisher: CRL
Year: 1987
Protection: checks fat track 35/36
Contributor: mayhem, quapil
Notes: cifo - verified
Verified: 1
Last Modified: 2012-01-29 20:27:07
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Title: Cop Shocker (PAL)
Publisher: Digital Marketing
Year: 1989
Protection: Checks non-standard density within a sector.

1. Seeks to track 35, sector 1
2. Reads 41 GCR bytes after the sync mark, they must all be $5A.
3. Changes to highest density.
4. Read 3 GCR bytes, remembering the 3rd byte.
5. The next 10 GCR bytes must all be the same as that 3rd byte.

The image is easily fixed for emulators by making those 11 bytes all the same (ie. $65). Fixing this for writing back to real diskette requires a special writing routine that can write this sector with the required non-standard density.
Contributor: nozy
Notes: cifo
Verified: 0
Last Modified: 2012-01-29 12:11:01
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Title: Mission on Thunderhead
Publisher: Avalon Hill
Year: 1986
Protection: checks signature on track 18 at boot
Contributor: hedning
Notes: cifo
Verified: 0
Last Modified: 2012-01-29 19:45:36
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Title: Guderian
Publisher: Avalon Hill
Year: 1986
Protection: Rapidlok V6
Contributor: hedning
Notes: cifo
Verified: 0
Last Modified: 2012-01-29 19:58:35
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Title: Panzer Grenadier
Publisher: SSI
Year: 1985
Protection: checks error on t33s5
Contributor: hedning
Notes: ifo - t13s6 is bad, disk damaged. If you patch checksum, game runs, but is probably corrupt in some way. Need another dump.
Verified: 0
Last Modified: 2012-01-29 20:05:11
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Title: Lincoln
Publisher: Multisoft
Year: 1989
Protection: none
Contributor: hedning
Notes: cifo
Verified: 0
Last Modified: 2012-01-29 20:10:03
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