It lives !

Drawing a line on the Microvision LCD

Okay, perhaps not the most exciting screen grab ever - a diagonal line - but it is done using TMS1100 code, programming the LCD driver, and it reverses the polarity.

There's a routine I'm quite pleased with at the heart of it (it starts at $3E0 on the picture) - it takes a value 0..15 (e.g. a coordinate) and pumps out a nibl sequence to the LCD Driver which is 4 x 4 nibbles, with a '1' bit at the appropriate position as specified by the coordinate (11,11) in this particular case (why there's a $B at $0F)