S100 Computers

Home S-100 Boards History New Boards Software Boards For Sale
Forum Other Web Sites News Index    
Digital Research Computers -- 16K EPROM Board
This was a the first ROM board DRC made.


The board was an early board so it did not met the IEEE-696 specifications. For example it had no 24 bit addressing.  It utilized 16 450 nsec. 2708 EPROMS.  The board had 0-4 wait state insertion capability and unused EPROM sockets did not use up the 64K RAM address apace. There was an interesting utilization of diodes to board deselect a particular EPROMs adderss space within the CPU's 64K address space. It did support the S-100 bus Phantom line for input but unfortunately not output (to inactivate othere overlapping RAM on the bus). 
The manual for this board can be obtained here.


Digital Research Computers S-100 Boards
16K RAM     8K RAM    16K ROM    32K EPROM    Sound Effects Board    Z80 CPU Board   128K RAM/EPROM   LS-100 RAM Disk
64K Static RAM


This page was last modified on 12/01/2013