I have 901226-01 and 901227-01 original ROMs 901226-01 and 901227-02 revised kernal ROM 901226-01 and 901246-01 4064 901226-01 and 251104-04 SX-64 901226-01 and 901227-03 second revision kernal ROM 251913-01 above ROMs combined As far as I know 901227-01, 901227-02, and 901227-03 are interchangeable. Commodore did not necerssarily change the ROMs and system boards at the same time. In addition, many older C64s were upgraded when new ROMs became available. On Fri, 9 Nov 2018, Francesco Messineo wrote: > Hi all, > I've been reading the C64 wikipedia entry and I believe there're some > incorrect statements: > > "The Kernal ROM went through three separate revisions, mostly designed > to fix bugs. The initial version is only found on 326298 motherboards, > used in the first production models, and cannot detect if an NTSC or > PAL VIC-II is present. The second revision is found on all C64s made > from late 1982 through 1985. The third and last Kernal ROM revision > was introduced on the 250466 motherboard (late breadbin models with > 41464 RAM) and is found in all C64Cs." > > --- > > My comments: > > 1) yes, mostly there're three revisions if we exclude the slightly > modified ones in the SX64, PET64, different keyboard models etc... > this would be 901227-01 and yes, probably only present in 326298 PCBs > and in the very early ones. I've never seen one in real life. > 2) The second revision would be 901227-02 and that, in my experience, > is present only in the 1982-1983 period PCBs. All 901227-02 I've seen > have 83xx date codes anyway. > 3) The third revision would be 901227-03 and it was introduced > somewhere between 1983 and 1984, as all 1984 and later C64 that I've > seen have the -03. > 4) The C64C just "condensed" basic and kernel ROMs into one single > 16Kbyte ROM instead of the 2 x 8Kbytes of the previous PCB revisions. > It still uses the 901227-03 image, even if obviously the part number > of this new ROM changed. So we can't really speak about a "revision" > here. > > What do you think? At least some parts of that wikipedia entry should > be rectified imho > > Frank IZ8DWF > > wlevak@sdf.lonestar.org SDF Public Access UNIX System - http://sdf.lonestar.orgReceived on 2018-11-10 00:00:02
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