Reading ESDI disks

Fred Cisin cisin at
Thu Feb 11 16:35:27 CST 2021

On Thu, 11 Feb 2021, Paul Berger via cctalk wrote:
> I do seem recall using ESDI drives in a PC with 16 bit ISA slots but it is a 
> long time ago but I am not sure if the controller used was the RT controller 
> you have pictured, it seems to me the one used was a Western Digital 
> controller. 

The most likely ISA ESDI would be the WD1007 controller.
There were a few variant submodels of that, such as with/without floppy 
support, w/wo BIOS ROM.

Mine had the ROM.  On one machine, I had a 200M 3.5" drive.  My first 
drive of that size of both capacity and physical size.
I think that I know where it is.

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