Paul Schlyter wrote:
In article <wc02f.8681$oc.149@newsread2.news.pas.earthlink.net>, BluPhoenyx <bluphoenyx-@-earthlink.net> wrote:As for how to combine two .nib images, I don't know.Why not simply try to concatenate the images? On a UNIX machine, you do like this: cat image1.nib image2.nib > combined_image.nib and in a Windows machine you do (from a command line): copy /b image1.nib+image2.nib combined_image.nib
No! Have you tried this? A nib is 232960 bytes long and two times 143360 is 286720. This wouldn't work.
The dsk format is sector contents directly 256 bytes times 16 sectors times 35 tracks.
The nib format seems to be each track as it would be seen by the drive head that is 416 bytes times 16 sectors times 35 tracks. Sometimes it seems that it is sectors still, not tracks, but some nib files seems to be starting in the middle of a sector so it is probably tracks, even when each sector is 416 bytes.
So how does SST store this information... in the nib there is extra 160 bytes per sector. I don't know if it is this regular in SST's format. There seems to be stored two tracks per on track original or maybe two sectors per original sector. There is probably some header information saying number of bytes etc.
I would be interested in a tool that would do the opposite of the question in this thread, to break a nib into two dsk images that can be used with ADT and SST "unpack" on a real Apple. SST fails miserably in the emulators doing this, to "pack" a nib into two dsk images. If someone would point out an emulator where SST pack wouldn't fail that would also help.
Maybe some source code for handling nib and dsk would enable me to understand more.
Knut