Graphics to sign
Dos program has the option to download a graphics file. haven't been able to figure out the file fromat.

the command "GR A 1" will send the file A.GED to the sign in slot 1.

format of command is GR [a..dA..D] [1..99]

gr a 2 - send a.GED to sign in slot 2

Anybody have any ideas??

Links on the web
http://kuci.org/~jburley/LED C Code including checksum calculation. DOS program distributed with sign and a disassembled listing.

http://www.dickwick.com/sign/ Test scrips to download. Includes binary file from ROM inside of sign. Sign is a 6502 processor.

http://www.eio.com/public/led/index.html discussion group. Hard to find new useful info in the noise.

http://signindustry.com/mb/list.php?f=19 Another discussion group

http://www.fiverod.com/silentradio/ copies of dos program and instruction sheet. link stopped working