Delete comment from: Ken Shirriff's blog
robus said...
Thanks for this helpful write up, but I'll admit confusion over the Subtract handling. In order to get the calculation to work Carry in must be set? For example: If the accumulator has 0x50 and I want to subtract 0xF0, the algorithm states that we ones-compliment 0xF0 reulting in 0x0F and then call ADC - giving a result of 0x5F, not 0x60 as expected. What sets the carry flag to avoid this?
Aug 20, 2022, 10:15:44 PM