244ce476   
   From: joe@user.com   
      
   "Kelly Leavitt"  wrote in message   
   news:2a9da160-62b0-435d-9b2c-394aaf0a6f3f@p1g2000yqk.googlegroups.com...   
   >>On Oct 12, 3:49 pm, Ken  wrote:   
   >> Hello list,   
   >>   
   >> I've done the obligatory googling and haven't been able to determine   
   >> if a 6000 emulator exists out there.   
   >>   
   >> So, does a 6000 emulator exist out there? Would be pretty awesome to   
   >> fire up Xenix under one again. I have even found the install disk   
   >> images for 3.2.   
   >>   
   >> If not, is there still enough hardware, software and tech info to get   
   >> a real system together and make a proper go at creating an emulator?   
   >>   
   >> Let me know!   
   >> Ken   
   >   
   >I'm sure there is enough hardware, software and tech info to get it   
   >running. I have heard that there are some issues emulating the   
   >interface between the 68000 and th z80 though.   
   >   
   >Somone was working on a native model II emulator, but it seems to have   
   >never been released.   
   >   
   >Someone tried porting the model II to MESS, and I'm not sure how far   
   >that got.   
   >   
   >Kelly   
      
   If you can get a Model II emulator up and running, then the 16 should be   
   relatively easy.  There were NO changes from the 2 to the 16 from the Model   
   II perspective that couldn't and wouldn't be detected from the OS.   
      
   The other key to this would be the 68000 side.  But that's pretty simple, as   
   it communicated to the Z80 side via a 'window' in memory.  The 68000 side   
   was pretty simple.  At least with the early machines, the only thing you'd   
   have to handle would be the 'offset limit' registers that were essentially   
   'adders' to the address bus.   
      
   Overall though, you'd have to keep two 'threads' running in the emulator at   
   all times.  One thread that ran the 68000 board emulator, and the other that   
   ran the Model II emulator for all the I/O.  Both sides would be looking at   
   the shared window.  There's shouldn't be too much of a 'sync' issue, as   
   there never were any issues that I was aware of about different speeds   
   affecting things.   
      
   Later machines were quite enhanced beyond the original essentailly bare   
   68000 board, but once you get the basic up, that could come later.   
      
   Mike   
      
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