Dynamic Ram Memory

Also:

• The 16C74A to 256KB SIMM interface (can easily adapt up to 4 MB)
• Ken Websters PIC16C74 serial port multiplexer. This includes a complete SRAM interface and memory test code.

See also:

• http://www.pjrc.com/tech/mp3/simm/simm.html microcontroller interfacing with SIMMs
• http://home.kabelfoon.nl/~bertrik/bat/timexp.htm Time expansion detector idea
• http://www.abraxis.com/incr/dram/ (cached 20000427091213) This file was missing all the images and was pretty useless without them. Thanks to Kelly Kohls, N5TLE Dallas, TX for the hint required to allow me to recover the images from the .ps file. (see the cached page)
• http://www.jdm.homepage.dk/dram.htm using a Fast Page Mode DRAM's Refresh Counter Test Cycle followed by a Read / Write cycle so that the row address is loaded from the interal refresh counter and no external multiplexor or counter is needed.