In SX Microcontrollers, SX/B Compiler and SX-Key Tool, rich2006jag wrote:

Well, it works!
I made an interface cable to connect to the sign, as in my previous post.  I ran the software, made a message and downloaded to the sign.  When the sign receives the message it scrolls 'RC880' and then displays the downloaded message.  I tried the 'colors' commands, but my sign only has red leds... but it's OK.
The input power circuit has a bridge rectifier at the input, so it seems that the original power supply is AC output of at least 12V and after rectification it feeds into the 5V regular (LM7805).
A 8K SRAM chip holds the messages and has a backup battery of 3.6V.
I did not see any data out of the IC9 chip, so it's a mystery what it does .. any ideas anybody?

That does it for this sign.
Rich

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