secondary FDC on PC with MS-DOS?

[Chris M]

seems strange. If there's a way of disabling the
floppy portion of the controller, you could try using
an ancillary floppy controller.
 Is your cabling correct?

--- Andrew Lynch <lynchaj at yahoo.com> wrote:

> Hi,
> 
> I am building a test station using an old 486 ISA
> only computer to test
> floppy disk drives and old ST-506/ST-412 style hard
> disk drives.
> 
> The computer seems to work OK and has a Western
> Digital ST-506 MFM hard disk
> controller with a FDC on the card (IO address $1F0).
> 
> To help with testing floppy drives, I thought I
> would add a secondary FDC
> however that is turning out to be much more
> difficult than I planned.
> 
> It seems there are drivers required to make floppy
> drives attached to the
> secondary controller appear as drive letters under
> MS-DOS.
> 
> I searched around a bit and found SDRIVE.SYS which
> refuses to acknowledge
> any of the other FDCs I place in the computer at the
> secondary address (IO
> address $170).
> 
> There are some references to a DC2.SYS program but I
> cannot find it anywhere
> online.
> 
> http://www.seasip.info/VintagePC/floppies.html
> 
> Does anyone know how to add multiple FDCs to a PC so
> I can have multiple
> floppy disk drives?
> 
> Of course, the Compaticard IV would be nice but
> those are very expensive and
> almost unobtainable these days.  I have a
> Compaticard I which "sort of"
> works but the drive gives errors every other time I
> access it.
> 
> Thanks in advance for any help -- especially if
> someone could send me or
> tell me where I could find the DC2.SYS files.
> 
> Andrew Lynch
> 
> 



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