Hello Martin, Hoffmann-Vetter, Martin schrieb: >> I don't want to open up other such speculations but I would expect >> that both chips (-01 and -02) are the same DOS version, but different >> revisions. Basically both being DOS 1.0, but the -02 with a bugfix. > > 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 http://www.ffd2.com/fridge/chacking/c=hacking15.txt On the other side there are references to and citations from printed material that mention a "DOS 1.0" in relation to the 901466-02 chip code: http://www.zimmers.net/anonftp/pub/cbm/firmware/README.txt See also the TOC entry: " DOS 1.0 Bug Notes (2040)" > We talk about the FDC rom. You can change the dos for some modification > without changing the FDC rom. It's only 1kB! Okay, if there is an error it > must be corrected. But was there errors in the fdc from dos 1? I see some references that people back in the past wrote up articles about all the bugs, but I can't find the referenced articles/boot in electronic form. >>> At home i >>> have a 901466-02 chip, but that can't be read out in dos1. >> >> This is interesting. Once I read a posting from Anders Carlsson over >> here where he also told that DOS1 cannot be read out with the well >> known method from William/Olaf/Marko. > > That's a goog question. I remember that some commands are missing. But if i > look at the disassembly (see above) all you need is into dos 1. If a have > time, i try it with the vice emulator. At least Andrč mentioned that he wrote a tool that would be capable to read out even DOS 1 FDC ROMs (from the RRIOT chip). >> Do you know why this is so? Does this unability belong to executing >> job codes (let the DC execute a memory page copy routine)? Or has it >> something to do with the BC? I would like to try to find a solution >> for this within my version of the ROM copy tool. > > That's a good idea. If Andrč's tools doesn't work, we might go further and try to find a solution based on my routine. This will work in the end, I'm sure. >>> I've build an >>> adapter to read it as an eprom, but i forgot to clock phi2. So i try >>> it at a later time. Or has anyone readout the 901466-02 or -01? >> >> That would be really great and I don't think that evereone else did it >> yet. The Zimmer's archive doesn't it now as well as other places. > > Yes, i've posted last night, i want to try with a shift of the addess lines. > And so Phi2 can be connected to A0. With this clock signal i hope to readout > the 6530. > >> I'm willing to extend and/or fix my dumping tool to your local needs >> (to make extracting feasible, not fulfilling all your wishes ;-) as >> long as there is a chance to get a copy of the extracted image file. > > At this time, i only have the chip 6530. I found it near some other > commodore chips. So i don't have a working 4040 (or 2040) with dos 1 roms. I see, so you hopefully get it don't with your phi2 emulation ;-) Womo -- ------ to obtain more infos about me, look up the page ------ ------ http://www.wmsr.de | wm (at) wmsr (dot) de ------ Message was sent through the cbm-hackers mailing listReceived on 2011-08-16 21:00:31
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