STOP! Use a hex editor that loads the entire image linearly. Chances are as I described previously. Bytes added as a header or as a trailer or both. Remove them and resave the image. DOS 3.3 disks usually start with $01A5, and ProDOS with $0138. Disks with their own RWTS will start with something else, but can most times be identified as the start of T0/S0. If you have trouble ID'ing an image, then you can email one to me and I'll fix and explain it to you. William Garber Email Address - willy46pa@garberstreet.com Alt. Email - willy46pa@comcast.net Web address - http://www.garberstreet.com
all is good. the images in question both start $01A5. i understand sector skewing under 3.3 and prodos and the images dumped by the editor are linear. if i dump an image of the 3.3 system master and look at $00011000 to $00011FFF, it is the volume directory in correct order, vtoc at $11000 to 110FF, directory backwards from $11FF0 to $11100.
i pulled an image of 'situation critical' from a real 3.3 disk and compared it to one i downloaded. the download image has trash added beginning half way through the last sector of the disk, putting it oversize. the 3.3 disk is 00's
the second was 'crisis mountain'. on the 3.3 disk the game data appears to only occupy the first half of the disk, and it has a shortened -properly formatted, however- hack directory. the second half of the disk is mostly the same 256 bytes over and over again to about $18f00 then all $00s. the downloaded image is the same for the most part. the repeated 256 bytes go to the end of the disk
then over.i shortened both of these to 143360 bytes and they seem to work fine when saved to a floppy.
i would like to find the source code for 3.3. all of it. the 256 bytes on the card, the 256 bytes on t0/s0, the next t0/s1 to t0/s9 and then the rest. i think that's right, it's been a while since i read beneath
apple dos. i'll leave that for another day. -matthew