On Friday, October 14, 2011 at 9:15:21 AM UTC-4, Mike Y wrote:   
   > "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   
      
   In the recent version of MAME that I have both the TRS-80 Model II and the   
   Model 16 boot TRS-DOS. The Model II is marked as working but the Model 16 is   
   marked as non-working.   
      
   --- SoupGate-Win32 v1.05   
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