WD1002s-shd

From: Joe <rigdonj_at_cfl.rr.com>
Date: Sun Mar 2 17:43:04 2003

  Thanks Erik. Any idea what it's good for? or what systems may use it?

    Joe

At 10:35 AM 3/2/03 -0800, Erik wrote:
>Joe wrote:
>> Found this a few days ago. I think it's a SASI to ST-412 bridge board.
>
>No, not SASI. The host interface was of WD's own devising. It has eight
>data lines, three address lines, select, read and write strobes, an
>interrupt and a data transfer request. There's an eight-register "task
>file", containing registers to select the drive, cylinder, head, and
>sector, issue commands, read status, and transfer data.
>
>Various small computers from the early to mid 1980s used controllers from
>this family. For instance, the hard disk subsystems from Radio Shack for
>the TRS-80.
>
>The WD1010 and WD2010 were basically an (almost) single-chip version of
>the WD100x board.
>
>The ATA (IDE) host interface is a direct descendent of this, although not
>100% compatible.
Received on Sun Mar 02 2003 - 17:43:04 GMT

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