-------- Original-Nachricht -------- > > Are you sure? The most sources write only dos 1 (without the dot zero) > not > > DOS 1.0. At > http://www.6502.org/users/andre/petindex/drives/roms/index.html > > andre write about the first useable dos is DOS 1.2. So is think > 901466-02 > > must be DOS 1.2. But what's about the 901466-01 and DOS 1.0? > > it seems you are right and your explanation sounds reasonable. > > > And in fact, Jim Brain's "Canonical List of Commodore Computer > Equipment", Version 2.0, printed in C=hacking Issue #15, from April > 1998, mentions at least two 2040 disk drives with two different DOS > versions, 1.0 and 1.2. > > * CBM 2040 Dual 5.25" 170K, DOS1.0, Off-White, No Rel Files, > IEEE-488. GP > * CBM 2040 Dual 5.25" 170K, DOS1.2, Off-White, No Rel Files, > IEEE-488. GP > IIRC this was my original source for the content on my web page. > > At least Andrè mentioned that he wrote a tool that would be capable to > read out even DOS 1 FDC ROMs (from the RRIOT chip). I don't remember the details, but it must be the one listed here: http://www.6502.org/users/andre/petindex/drives/progs/index.html Not sure if it actually reads the DOS1 FDC ROM though, I never had a DOS1 drive. It uses the $E0 drive code, which is required for the format code to be executed in a buffer (the format code does not fit into the FDC ROM, so the execute drive code $E0 has to be there right from the start with DOS1) See the DOS1 ROM listing around: FB2F A5 80 LDA DRVNUM FB31 09 E0 ORA #$E0 ; or with EXEC FB33 8D 03 10 STA JOBS André -- Empfehlen Sie GMX DSL Ihren Freunden und Bekannten und wir belohnen Sie mit bis zu 50,- Euro! https://freundschaftswerbung.gmx.de Message was sent through the cbm-hackers mailing listReceived on 2011-08-16 22:00:04
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