From: as@sci.fi   
      
   David Hoelzer  writes:   
      
   > Hiya!   
   >   
   > I just purchased a ROM image set from RetroInnovations (I have emailed   
   > them and am still waiting for a response) for the 128-DCR.  The   
   > problem I have is that they come with absolutely no documentation.   
   >   
   > I'm assuming that the JiffyDOS_C128DCR_6.01.bin and C64_6.01.bin end   
   > up together in an EPROM in U32, but how do they get put together?  Or   
   > do they go somewhere else?   
      
   Looks to me U32 in a 128DCR should have the C64 basic and C64 and C128   
   kernals all in one chip. From the description on RetroInnovations it   
   seems like they ship only the kernals in separate files? So if your   
   JiffyDOS_C128DCR_6.01.bin is 16 kB and C64_6.01.bin is 8 kB then that   
   would seem to be the case.   
      
   So you'll need to combine a C64 basic with those two kernals for one 32   
   kB image. From a quick look at the C128DCR schematic and PRG it looks   
   like the high half of the ROM has the C128 kernal so the low half should   
   have the basic and C64 kernal. I don't know which order but I'd guess   
   basic first since it's first in the C64 memory map. Could be the other   
   way around too of course. Still, only two combinations to try...   
      
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