S100 Computers

Home S-100 Boards History New Boards Software Boards For Sale
Forum Other Web Sites News Index    
Advanced Digital Corp. --  1001 Hard Disk Controller
This was Advanced Digital Corp's one and only board to interface with a hard disk.   It represented state of the art at the time.


The HDC-1001 was an S-100 bus Winchester hard disk controller board with error correction (ECC) capabilities. It was designed to interface up to four Winchester disk drives. There were two versions of the board, the HDC-1001-5/8. The HDC-1001-8 operated on 8" drives. The HDC-1001-5 was used with most 5-1/4" drives. The drive signals were based upon the floppy look-alike interface available on the Shugart Associates SA1000, the Seagate Technology ST506, and other compatible hard drives. All necessary buffers and receivers/drivers were included on the board to allow direct connection to the drive. Four 20 pin radial connectors were provided for data. Either a 34 pin (5" drive) or a 50 pin (8" drive) connector was provided for drive control. All data to be written to or read from the disk, status information, and macro commands were transferred via the S-100 bus. An on board sector buffer allows data transfers to the host computer independent of the actual data transfer rate of the drive.

The board utilized the Signetics 8X305 bipolor microcontroller to talk to the hard disk. .  This board was IEEE-696 compatible and really well laid out.
The excellently written manual for this great looking board can be obtained here.


Other Advanced Digital Corp.  S-100 Boards
Super Quad SBC     Super Slave SBC    Super Six SBC    HDC      Super 186 SBC     MultiSlave


This page was last modified on 10/25/2013