Old Display- how to use?

Hello,
I bought and Sparkfun LCD display "a while" ago and do not find the info how to use it any more. What voltage at power supply and signal (3.3 or5V?)? What library to use?

Thanks all for your help!

I googled the part number and got this back: This is the latest evolution of our serial LCD. Included on a single board is a 20x4 LCD and an embedded circuit based around a PIC 16F88. The on-board PIC takes a TTL serial input and prints the characters it receives onto the LCD. The installed firmware also allows for a number of special commands so you can clear the screen, adjust the backlight brightness, turn the display on/off, and more.

Communication with SerLCD requires 5V TTL serial at a default baud rate of 9600bps (8-N-1). You can adjust the baud to any standard rate between 2400 and 38400bps. The power (VDD), ground (GND) and RX pins are all broken out to both a 0.1" pitch header as well as a 3-pin JST connector.

SerLCD has the ability to dim the backlight to conserve power if needed. There is also a potentiometer on the back of the display to adjust the contrast.

Look under documents and you will find everything you need even code.

https://www.sparkfun.com/products/retired/9568

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