Question: 1. What happens when bits 5 and 6 of the ACIAs control register are loaded with 1,1?
2. The status register of the 6850 is read and is found to contain the following values. How are they interpreted?
a. $00 b. $01
c. $43 d. $02
3. What is the difference between an overrun and a framing error?
4. Write an exception handling routine for a 6850 ACIA to deal with interrupt-driven input. Each new character received is placed in a 4-Kbyte circular buffer. Your answer must include schemes to
(a) deal with buffer overflow and
(b) to deal with transmission errors