From: larry_fosdick@hotmail.com   
      
   "Knut Roll-Lund"  wrote in message   
   news:T8idnYEAM_Sbe9TZ4p2dnA@telenor.com...   
   > dkelvey@hotmail.com wrote:   
   >> Hi   
   >>  I'm looking for a list of commands and ports for the TRS-80 5Meg   
   >> disk controller. I'm trying to us it in an application that used   
   >> a WD1000 compatable controller but the I/O mapping is not the   
   >> same.   
   >>  Can anyone give me a pointer to something on the web or a list   
   >> of the I/O addresses and register names.   
   >> Thanks   
   >> Dwight   
   >>   
   > I also found I have a gif with schematics of 'WD1002 harddisk interface',   
   > pinning fits the model I expansion port. Its base address is C8, with 8   
   > registers, no jumpers.   
   >   
   > I don't remember where that came from but I was once collecting   
   > information with the intention to make an IDE interface, never did though.   
   > I really like the silence of the old machines, a spinning harddisk would   
   > destroy that.   
   >   
   > Knut   
      
   Knut,   
      
   That sounds like the host interface posted on the Dutch TRS-80 site.  You   
   are correct, that interface uses 8 ports starting at C8H.  If you look at   
   the port description I pulled from Ira's site, port C8 is the R/W port for   
   the Tandy drives.   
      
   I actually built one each  of those interfaces for my Model I's and Model   
   4's.  They work really well.  They do not implement hardware write-protect,   
   so I had to patch the drivers to not look at port C0H which is where that is   
   done.  Other than that, the CP/M and LDOS drivers work the same on those as   
   they do on the Tandy 5 MB drives.   
      
   Larry   
      
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