On Thu, 10 Apr 2014, Hoffmann-Vetter, Martin wrote: > Hello, > >> As far as I can determine, there was only one version of DOS 1, >> although Commodore's documentation referred to it variously as DOS >> 1.0 and 1.2. > > I've read at the Book "Programming the PET/CBM" from Raeto West. The author > differ between DOS 1 (2040) and DOS 1.2 (3040). He also show the difference > about the digital main board. The 2040 board with DOS 1 is _not_ > upgradeable. Only the newer 3040 board is upgradable from DOS 1.2 to 2.1. At the University of Michigan we had an early version of the 2040. It was upgraded to DOS 2. Commodore's 1987 price list indicates that the 2040 ROMs were DOS 1.2. > The other point is, there exists a 901468-05. This must be an earlier > version of the 901468-07 (High ROM). And now you can combine what's about > the numbers -01 and -02 or -03 and -04. > > Or if i remember correctly, there exists many early version of 2040 with so > many bugs, that there are not usable. Are this the version -01/-02 > or -03/-04? There may have been many pre-release versions of the ROMs. That the earlier versions of the ROMs had serious bugs, and were not usable, would indicate that they were pre-relaese. >> The power up message on the drive says only DOS, and does not give a >> number. > > That's the problem. Starting with DOS 2.5 the correct DOS version is > reported. > > What's about the DOS 2.0 for 4040? There exists two version. Is the > revisited version the DOS 2.1? The power up message is the same. > Did anyone own the commodore tech topics from 1979? This must be the year > with the info we needed ... > > Martin > > > Message was sent through the cbm-hackers mailing list > wlevak@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.org Message was sent through the cbm-hackers mailing listReceived on 2014-04-11 06:00:08
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