Search found 402 matches

by brightcaster
Mon Jun 14, 2021 5:04 pm
Forum: Dumping
Topic: Sublogic Flight Simulator Scenery Disk Format (IBMPC)?
Replies: 8
Views: 136

Re: Sublogic Flight Simulator Scenery Disk Format (IBMPC)?

IF you want to analyze it with the HxC-Tool, here is the trick for converting 360rpm to 300rpm streams: Go to the menu "Settings/Internal parameters" and change the value for FLUXSTREAM_RPMFIX from "NONE" to "360TO300RPM" and hit "close". Don't forget to chang...
by brightcaster
Sun Jun 13, 2021 1:56 pm
Forum: Dumping
Topic: Sublogic Flight Simulator Scenery Disk Format (IBMPC)?
Replies: 8
Views: 136

Re: Sublogic Flight Simulator Scenery Disk Format (IBMPC)?

I can't see any boot sector on disk 263 and 265! Only disk 264 has the standard which tells you that it's not a system disk when you accidentally left the floppy inserted during a restart....

Can't see any speedlock track either...

David
by brightcaster
Fri Jun 11, 2021 8:43 am
Forum: Support
Topic: Test image for an 8" drive?
Replies: 28
Views: 360

Re: Test image for an 8" drive?

Since nobody knows how the floppies have been stored over the decades, there could be small residues of mold on the surface, which are worn off a little more with each read-write process. It happens more often that floppies give very bad results on the first attempt and then show fewer errors on eac...
by brightcaster
Thu Jun 10, 2021 9:00 pm
Forum: Support
Topic: Test image for an 8" drive?
Replies: 28
Views: 360

Re: Test image for an 8" drive?

The very first sector has "APOLLO" in it, not sure what logical format/file system is that... could be e.g. a backup archive too, some of those did something similar to ID their own disks quickly. Could be this machine: https://www.computerhistory.org/collections/catalog/102678356 https:/...
by brightcaster
Thu Jun 10, 2021 10:13 am
Forum: Support
Topic: Test image for an 8" drive?
Replies: 28
Views: 360

Re: Test image for an 8" drive?

You mixed up 512/1024 byte sector size in your last post (parameter -z2 vs -z3). The new image of disk 1 contains 8 sectors per track with 1024 byte each! Thats DSHD not DSDD.... So what you wrote back, was a HD image! Maybe you picked a wrong file? I guess your Mitsubishi M2896 is not capable of re...
by brightcaster
Wed Jun 09, 2021 2:05 pm
Forum: Support
Topic: Test image for an 8" drive?
Replies: 28
Views: 360

Re: Test image for an 8" drive?

I've attached the decoded image, but it does not seem to contain anything useful, maybe some database? Just a hunch, but... each record is 128 bytes, 0x40 means valid, 0x60 deleted, then the record number/offset etc. record itself is gibberish, maybe byte order is scrambled or has some simple encry...
by brightcaster
Tue Jun 08, 2021 9:37 pm
Forum: Support
Topic: Test image for an 8" drive?
Replies: 28
Views: 360

Re: Test image for an 8" drive?

Disk 9 claims to be space quest II for MSDOS 3.3 with a FAT12 filesystem (8sectors, 1024 byte). But sector 8 each track on both sides shows a bad data checksum!

I guess it's a copy from a 5,25inch 1,2MB floppy...

Disk 8 is very weird with FM parts on it. Will look at it tomorrow.

David
by brightcaster
Tue Jun 08, 2021 5:28 pm
Forum: Support
Topic: Backing up MSX Disks
Replies: 1
Views: 67

Re: Backing up MSX Disks

As with all copy protected floppies where you don't know which protection was used Kryoflux streamfiles (so called .raw files) are the only choice...

The HxC Tool can read Kryoflux streamfiles and export dmk...

https://hxc2001.com/download/floppy_dri ... r_soft.zip

David
by brightcaster
Mon Jun 07, 2021 7:27 pm
Forum: Support
Topic: Test image for an 8" drive?
Replies: 28
Views: 360

Re: Test image for an 8" drive?

As far as I know there are only 3 DOS FAT format for 8inch drives: Formatted Capacity 250K 500K 1.2 MB ----------------------------------------------- # of Heads (Sides) 1 2 2 # of Cyls (Tracks) 77 77 77 # of Sectors/Track 26 26 8 Total # of Sectors 2002 4004 1232 # of Bytes/Sector 128 128 1024 # of...
by brightcaster
Thu Jun 03, 2021 8:53 pm
Forum: Support
Topic: Panasonic JU-475-2 5.25" drive jumpers settings
Replies: 4
Views: 111

Re: Panasonic JU-475-2 5.25" drive jumpers settings

The sheet in your first posting shows the factory settings...

David