Atari Drives: http://www.cyberroach.com/analog/an10/percom.htm

Flex User Group History: http://www.ipblythe.com/fug3.htm

Old Computer Company Phone List: http://www.textfiles.com/phreak/NUMBERS/800-bbs.txt

Up Your Model I by Bruce Powel Douglass Article: http://members.tripodnet.nl/electrickery/comp/lnw/articles/doublers.html

LDOS Quartly Newsletter Oct 82: http://www.tim-mann.org/trs80/doc/ldosq1-6.txt

Search the Web for 'PERCOM CASSETTE': http://www.google.com/search?hl=en&safe=off&q=percom+cassette

Search the Web for 'PERCOM ATARI': http://www.google.com/search?hl=en&safe=off&q=percom+atari

Search the Web for 'PERCOM DOUBLER': http://www.google.com/search?hl=en&safe=off&q=percom+double

Search the Web for 'PERCOM DALLAS': http://www.google.com/search?hl=en&safe=off&q=percom+dallas