From: larry_fosdick@hotmail.com   
      
   "JBlaser"  wrote in message   
   news:op.tvfaskf48pn154@portege...   
   > All right, all of you Tandy 1000 experts...here's one for you:   
   >   
   > I'm trying to add a vintage hard disk to my vintage 1000A.  I know there   
   > are   
   > lot's of choices, even IDE or SCSI is a possiblity with these old systems,   
   > but I'm trying to keep this all in the realm of mid-1980's tech.   
   >   
   > My 1000A (BIOS 01.01.00) has seen the Intel 8088 replaced with a NEC V-20   
   > CPU long ago, and has a PLUS Memory Expansion board installed with   
   > 512KB of RAM and the PLUS RS-232 daughter board in the left-most   
   > (outside) slot.  Otherwise, the system is in it's original configuration.   
   >   
   > I'm trying to add a 20MB MFM drive (a Seagate ST-225) using a Western   
   > Digital WD1002S-WX2 controller.  I have tested both the controller and the   
   > hard disk in a Leading Edge Model D PC clone, and confirmed that they   
   > are fully functional.  I have cut the W7 hardwire trace on the solder-side   
   > of   
   > the WD controller, and jumpered pins 2-3 to select IRQ 2.   
   >   
   > Here's what happens:   
   >   
   > When booting up I see the normal MEMORY=640K message, then the   
   > floppy drive spins with the drive select LED showing for a second, then a   
   > pause, and then one or the other of:   
   >   
   > A) The hard drive's LED lights up and stays on forever, and the system   
   > hangs at that point and never boots.  CTRL-ALT-DEL is effective for a   
   > warm reboot.   
   >   
   > B) The hard drive's LED briefly flicks on and off, another pause, and then   
   > the system boots from my boot floppy.  But any subsequent attempt to   
   > access the hard drive results in the hard drive LED lighting up and   
   > staying   
   > on, and the machine hangs forever.  A CTRL-ALT-DEL is effective for a   
   > warm booting.   
   >   
   > So, it seems that I don't have everything set up just right.  I'm at a   
   > loss,   
   > since all of my online research indicates that as long as I have the   
   > 01.01.   
   > 00 BIOS, the memory expansion board with DMA,  and use IRQ 2 on the   
   > controller, it should "just work".   
   >   
   > I was lucky to get my hands several WD1002S-WX2 controllers at the   
   > same time, and I've tried all five of them (yes, I mod-ed each for IRQ 2),   
   > with the same results.   
   >   
   > Any ideas?   
   >   
   > TIA,   
   >   
   > Jared   
   >   
      
   MFM drives had to be low level formatted with the particular controller   
   used.  Did you try to boot from floppy and then do a low level format?  It   
   was some bios call on the controller, but I can't remember the segment and   
   address.   
      
   Larry   
      
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