Acorn Arcade forums: Games: RTFM Software - Pon / Slappit
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RTFM Software - Pon / Slappit |
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sirbod (22:31 25/6/2012)
sirbod (10:21 18/7/2012)
sirbod (12:07 30/9/2012)
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Jon Abbott |
Message #120698, posted by sirbod at 22:31, 25/6/2012 |
Member
Posts: 563
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Does anyone have originals of any of the RTFM Software titles that they could image and send to me:
Pon
Pon in Winterland
Slappit
Sector 0 of my copy of Slappit is knackered. I've managed to read it via KryoFlux and reconstruct it, but the protection is failing and it looks like a method ADFFS doesn't currently support anyway. As I can't test the original, I can't be sure without an image to compare.
Instructions on how to image protected floppies with ADFFS are here
EDIT: I've managed to re-write the floppy and now have a working copy. Track 128 has an extended GAP3 and no data.
[Edited by sirbod at 17:24, 17/7/2012] |
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Jon Abbott |
Message #120812, posted by sirbod at 10:21, 18/7/2012, in reply to message #120698 |
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Posts: 563
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I spent all of yesterday analysing the disc protection on Slappit.
EDIT: The detail below is in fact the wrong way round, the 1772 is returning the current result. 710/711 chipsets return an incorrect result.
It does a DiscOp 3 to track 128 (64.0) and checks the result. What should return is two sector IDs of 0, 0, 0, 0 (cylinder, head, sector no, sector size) as there's only one sector with an valid ID CRC. Note it's repeated due to the head passing the track ID mark and picking up the first sector ID again.
This behaviour works correctly on the A4000, A7000 and RiscPC, and I expect also works on the A3000 and A5000.
However, a 1772 (eg A3x0, A4x0) returns:
72 x Fuzzy bytes (they change on each read)
Last two bytes of GAP2 and all bytes of track from there, included GAP's, ID's etc.
Consequently, this title and quite possibly other RTFM titles will only work on a physical machine. I'm not aware of any emulator supporting this behaviour, but I am now coding it into ADFFS.
I really need images of the other RTFM discs - someone must have them, that's prepared to spend 10 mins to image it with ADFFS.
[Edited by sirbod at 16:29, 1/10/2012] |
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Jon Abbott |
Message #121138, posted by sirbod at 12:07, 30/9/2012, in reply to message #120812 |
Member
Posts: 563
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I'm starting to code the protection method used by RTFM into ADFFS, if anyone has originals of any of their games beside Slappit, could you drop me an email at: Jon at jaspp dot org dot uk
Games I have documented by RTFM:
Dominate
Bouncer
Pon
Pon in Winterland
Rekall |
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Acorn Arcade forums: Games: RTFM Software - Pon / Slappit |
