CompuPro - Disk 2  & Selector Channel
CompuPro's Disk 2 & Selector Channel was a two board set to interface the S-100 bus to up to 4 Winchester hard disk drives.

The DISK board featured a set of ribbon cable connectors along the top which will directly accept up to four Winchester type hard disk drives selected from a variety of manufacturers, models and capacities. The board contained all of the hardware necessary to control the drives including the ability to format them. The board also contained the necessary hardware to arbitrate for and accept the bus as a temporary master per the IEEE 696/S-100 specification and to transfer data thereon. The second board the "SELECTOR CHANNEL" contained all of the hardware for generation of address, status and control signals required for temporary master operation of the DISK 2. The two board combination functions exactly as a temporary master per the bus specifications. No interconnections (other than the bus Itself) are required between the boards for operation and all bus signals are used in their normal way. The DISK 2 performs no useful function without the Selector channel board, but the Selector channel may be shared by other controllers designed to use it.
 
The Disk 2 had quite a bit of flexibility associated with it. The board used two IO ports which were switch configurable. Sector sizes were also switch configurable (128 bytes - 2K bytes). CompuPro provided CPM based software to format new disks.
 
The manual for these boards can be obtained here.

 

Other CompuPro S-100 Boards
CPU8085-88  CPU86-87  CPU-Z  Disk1  Disk1A  Disk1B  Disk2  Disk3   EconoROM2708  
RAM Boards   Interfacer 3  Interfacer 4  Interfacer II  M-Drive  MPX-Board  PC-Video  
System-Support1  System-Support2   SPIO  Spectrum  SP186   CPU-286   68000   SPUZ