CPU utilization is 50% as it is dual core
Image is divided to two parts because the LCD is using bits 0-3 for upper screen and 4-7 to lower. I just connected bits of the both parts. The main reason I didn't used whole image is that my current LPT-breadboard adapter is missing output lines. I need 8+3 to control the device.
This configuration is very slow. It is about 40 (!) times slower than recommended in datasheet. The screen is flickering- it is 2..3 fps!
This setup was done only to reverse engineer all timings and programming sequences.