C64 Zero Page, Thank god that Jim Butterfield and others of his kind long ago mapped out all the addresses in zero page and workspace that are used by the KERNAL and BASIC. The high order byte is often referred to as the page of memory. Oct 19, 2018 · Whenever you need to modify and access a variable in many places in the code, zeropage saves one cycle per instruction. Bit #x: 0 = Bit #x in processor port can only be read; 1 = Bit #x in processor port can be read and written. . Dec 11, 2021 · The first 256 Bytes of the C64 memory map (0-255 or $0000-$00FF) are called zeropage (Page 0). Bits: Bit #x: 0 = Bit #x in processor port can only be read; 1 … Read more The following codes are used by the Commodore 64 to stand for the CBM devices listed below: ADDRESS DEVICE 0 Keyboard 1 Datassette (TM) 2 RS-232C device 3 CRT display 4 Serial bus printer 8 CBM serial bus disk drive Device numbers 4 or greater automatically refer to devices on the serial bus. Processor port. For example, the address $1637 is in page $16 (22), and $0277 is in page $02 (2). Retrieved from " " Category: Addressing mode Page Lists of ROM entry points and zero page addresses for various CBM 8-bit machines (PET, VIC-20, C64) generated directly from assembler listing files - ethandicks/cbmsymbols Die ersten 256 Byte im Speicher (entspricht einer Page), also der Bereich von 0 bis 255 bzw. ga82x, yvugej8x, 1z4fw, yzpuk, hw5xcrau, if1kwf, d8l, sm621, fwr, 2z,