ocr: THE MEMORY MANAGEMENT UNIT (Continued) MCR=SD505 6 D Proc. Mcde f: 2-80 8500 EXPANSION FSDIR f : Borpit /GAME Sense /EXROM Sense OS Mode 0E 1= CB4 C128 43/80 Sense Mode Contiguration Register The Mode Configuration Register The control of the current system mode is governed by the Mode Configuration Register, MCR. Ito controls which processor, 8502 or Z-80, and which operating system mode, C64 or C128, is cur- rently in operation, and handles other overhead of the different operating modes, This register is located in the 1/O space at $D505. Several of the bits in this register function as bid ...
