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| Acmlm's Board - I3 Archive - General Emulation - Two FDS Questions |
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Imajin Bot Local Moderator Currently affected by 'No syndrome' ---!!!                   Since: 12-05-05 From: Camineet, Palm Last post: 6466 days Last view: 6466 days |
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| 1. The fourth level of the Famicom Disk System game Aisenshi Nicol is rather glitched in the FCEUXD emulator. Is this a known emulator problem? I have not been able to find other copies of the ROM to test them.
2. Does anyone know how a .FDS ROM is laid out, especially where the data for the disk sides is divided? I can't find information on this anywhere. |
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PrincessPeach Buzzy Beetle    Since: 11-18-05 From: Rüti ZH Last post: 6472 days Last view: 6472 days |
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| As much as I know, every Diskside is so and so kilobytes long, so it's reasonable that the next side / disk beginns after every XY bytes. Please mind the header.
The Famicom Disks are not Sector-Based, when the Game want's particular data from the disk, the hole content is streamed to the RAM-Cart. More info on Parodius.com. |
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kennametal Newcomer Since: 08-03-06 Last post: 6657 days Last view: 6657 days |
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| I realize this is a rather old thread, but I figured I'd reply anyway
1) My money is on an emu problem. I got through that level without any noticable glitches in another emulator. 2) $10 byte header, "FDS", $1A, followed by the number of disk sides (a value of '02' would be a single 2-sided disk) Following the header is the disk data -- Disk 1 side A, Disk 1 side B, Disk 2 A, etc packed tightly. Each side is an awkward 65500 bytes is size (rather than a nice even 64k) Inside each disk, there's sort of a file system structure. I haven't looked into it in detail, but nesdev has some docs on the basic layout I believe... This doc seems to lay out the file system structure pretty well -- though I only just glanced at it. |
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