Hello, > However, I have just realized they're not broken - they are just > stuck with Commodore DOS 1.X as opposed to the 2.X versions I am > used to. Some commands are'nt implemended in DOS 1. > if there is any way to upgrade them to a newer DOS version. Yes, you can update from DOS 1 to DOS 2 by changing the DOS-ROMs (901468-06 and 901468-07 for DOS 1 to 901468-11, 901468-12 and 901468-13 for DOS 2 or 901468-14, 901468-15 and 901468-16 for DOS 2 Rev.) and the RIOT (901466-02 for DOS 1 to 901466-04 for both DOS 2 versions). > My EPROM programmer can handle 2532 chips, > so upgrading the ROM is not a problem, but I have noticed that a > DOS 2.x floppy drive uses a different 6530 RIOT than a DOS 1. Correct, you must change the RIOT, too. > If I only upgrade ROM and keep the original RIOT, will it work at > all? No! > Is there any custom DOS 2 compatible version that could be > made to run with a board otherwise equipped for DOS 1? No! > Is there some known replacement circuit for 6530 chips? I see there > exists BIN code from a DOS 2 chip, so I assume there is a way to > program an "emulation" as well. I do realize it contains RAM, I/O > and timers so not trivial. Yes, have a look at the 8250LP, SFD1001 or the disc in 8296-D. Alle these bords have a doutherboard for the RIOT (e.g. 251252 rev. A for SFD1001 - http://zimmers.net/anonftp/pub/cbm/schematics/drives/old/1001/manual/47.gif) . Because Commodore don't put the new DC code for some DOS 2.5 and 2.7 versions in a new RIOT. They hide the ROM from the RIOT and put the new DC code in an additional EPROM (2716). So you can use a RIOT from any commodore floppy with any code. Best regards Martin Hoffmann-Vetter Message was sent through the cbm-hackers mailing listReceived on 2010-07-30 22:00:04
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