Hallo Julian and everyone else, > I wonder just what your reason for the question is.... First a remark on forehand: quite some I time ago I read "Inside Commodore DOS" and that book mentioned that you couldn't exchange floppies between a 1541 and a 4040. I never had problems with exchanging floppy disks between the brown 1541, 1541C, 1541-II and CBM 4040. I'm still busy with commenting the sources of the various ROMs and I noticed that in version 901229-03 the number of bytes in the header gap was increased from 8 to 9. This meant that 9 is also the value used in 901229-05, -06AA and the 1541-II. And this is the value that was already present in the CBM 4040. So it seems it was changed to 8 for the 1540 for one or another reasons. I have a 1540 but, to be honest, I never used it for programming, testing etc., etc.: I considered it too much as an collectors item. The rest of my 1541s have all been equiped with the 05, even the older long-boards (not done by me). And I wanted to know if this was a coincidense or was the 05 more wide spread than anything else. Except changing the checksum, changing the size of the header gap at two places was the only change of version 03. And these 9 bytes triggered me to remember the book. And as said before, I never had any, any problem at all so I thought the author must have it wrong in one or another way. But what? It now seems that the author must have been testing using a 01 or 02 version. After remark: this afternoon I got the idea to check my spare storage and that gave me another conformation of what is the most used ROM inside the 1541: I _only_ have 901229-05s ! -- Kind regards / Met vriendelijke groet, Ruud Baltissen www.Baltissen.org Message was sent through the cbm-hackers mailing listReceived on 2015-06-18 19:00:07
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