MICROPROCESSOR

 512

 65536

 256

 64

 Data transfer takes place between the I/O device and memory during every alternate clock cycle

 DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device

 The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses

 While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor

 all interrupts except non-maskable interrupt are disabled

 the microprocessor cannot be interrupted by any mask able interrupt

 the microprocessor cannot be interrupted by any interrupt

 the microprocessor can be interrupted by a non-mask able interrupt

 None

 8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O

 8085 has 5 interrupts lines, whereas 6800 has only two

 8085 has multiplexed bus, whereas 6800 does not have

 RST 7.5

 TRAP

 INTR

 RST 5.5