Initial base code
Checked SET, NOT, NEG, XCHG, SXTBD, and next word literal
ADD, ADD with literal, SUB and SUB with literal works. Carry and Overflow flags working. Carry also acts like burrow bit
Fixed missing MSB of next word literal. Checked overflow flag is set when overflows
Checked SWP and CPY
LOAD instrucctions working
Merge branch 'master' of https://github.com/Zardoz89/rc1600