I set out to write a driver for this IEE FLIP VFD screen.
I wanted to write a parallel input driver for added vintage points but I hooked up the WR pin to the MCLR pin on my Dev. board and damaged the pin when I programmed the PIC.
After about 30 minutes of denial, I decided to continue on but writing a serial driver.
In the end it was a whole lot easier than I thought. Getting the screen to write characters with Commas and Decimal points was a bit tricky.
The screen is Alpha Numeric, it doesn't take the whole ASCII Table and uses the unused ASCII characters for other things.
For example: ASCII 0x20 with a comma is replaced by 0x80
I had to write an interpreter function to change characters to their equivalent character with comma or decimal point.