The Atari 800-D Developers System

        The Atari 800D was a developers system which comprised several parts.   The first part was a CPU card (not an OS card from Slot #0) that had a ribbon cable that feed to the empty part of the right side of a normal Atari 800.   The Atari 800D had in that section an interface adapter, the ribbon cable plugged into that adapter.   Power was feed to the interface adapter from a hand solder pair of wires from the power board.  The interface has a RESET switch, external ribbon cable connector which feed to an S-100 card (More information below) and also what appear to be 2 DIP switch programmable serial ports.

Atari 800 on an S-100 Card

        Then a ribbon cable from the right side interface adapter feed into this S-100 bus interface card which is essentially an Atari 800 on a card (well sorta).   The card contains a PIA, POKEY, CTIA or GTIA and ANTIC chips.   These boards were used in Crememco S-100 systems (If you wanted to find the 2nd largest source of Crememco equipment you'd come to Atari, they had hundreds upon hundreds of them, the 1st largest source would have been Crememco itself).   These boards were used early on for writing new software for the Atari 400/800 systems.
 


       If any ex-Atari employees out there have additional information that could help shed more light on these components and there use, please contact us here at Atari Historical Society (webmaster@atari-history.com), we appreciate any and all help on learning and sharing any and all knowlegde of Atari related items such as this.