LM80C firmware release R2.10
20191226: SIO init code cleaning & improved support for serial RX; added extended char codes (128-255) for 6x8 fonts; removed double chars in 8x8 fonts
20191226: SIO init code cleaning & improved support for serial RX; added extended char codes (128-255) for 6x8 fonts; removed double chars in 8x8 fonts