ocr: THE Z-80 MICROPROCESSOR FOLDOUT SCHEMATIC SHEET 2, PAGE 74, FOR EASY REFERENCE. The Z-80 microprocessor is used as a secondary processor in the C128 to run CP/M based pro- grams. The Z-80 is interfaced to the 8502 bus and can access ali of the devices that the 8502 can access. Bus Interface Since a Z-80 bus cycle is much different than a 65xx family bus cycle, a certain amount of interfac- ing is required for a Z-80 to control a 65xx type bus. Since the Z-80 has built-in bus arbitration con- trol lines, it is possible to isolate the Z-80 by tri-stating its address line. Thus, the Z-80 and 8502 ...
