This is my Ben Eater (https://eater.net/6502) inspired 6502 breadboard project. This is a hobby project, my interests are learning how the 65c02 hardware works and learning some assembly programming.
Some of my divergences from the BE6502 project to date include:
- Clock speed 3Mhz.
- 4-Bit mode for the 1602A LCD Module.
- Using W65C22 T1 timer to add delay for LCD module setup time.
Abbreviated Memory Map
Decimal Hex Binary Desc
0 0x0000 0000000000000000 0000 - 00ff = RAM [Zero Page]
.. .. .. ..
255 0x00ff 0000000011111111 0000 - 00ff = RAM [Zero Page]
256 0x0100 0000000100000000 0100 - 01ff = RAM [Stack Pointer]
.. .. .. ..
511 0x01ff 0000000111111111 0100 - 01ff = RAM [Stack Pointer]
512 0x0200 0000001000000000 0200 - 3fff = RAM
.. .. .. ..
16383 0x3fff 0011111111111111 0200 - 3fff = RAM
16384 0x4000 0100000000000000 4000 - 5fff = Open Bus
.. .. .. ..
24575 0x5fff 0101111111111111 4000 - 5fff = Open Bus
24576 0x6000 0110000000000000 6000 = I/O Register B
24577 0x6001 0110000000000001 6001 = I/O Register A
24578 0x6002 0110000000000010 6002 = T1 Low Order Latches/Counter
24579 0x6003 0110000000000011 6003 = T1 High Order Counter
24580 0x6004 0110000000000100 6004 = T1 Low Order Latches
24581 0x6005 0110000000000101 6005 = T1 High Order Counter
24582 0x6006 0110000000000110 6006 = T1 Low Order Latches
24583 0x6007 0110000000000111 6007 = T1 High Order Latches
24584 0x6008 0110000000001000 6008 = T2 Low Order Latches/Counter
24585 0x6009 0110000000001001 6009 = T2 High Order Counter
24586 0x600a 0110000000001010 600a = Shift Register
24587 0x600b 0110000000001011 600b = Auxiliary Control Register
24588 0x600c 0110000000001100 600c = Peripheral Control Register
24589 0x600d 0110000000001101 600d = Interrupt Flag Register
24590 0x600e 0110000000001110 600e = Interrupt Enable Register
24591 0x600f 0110000000001111 600f = I/O Register A sans Handshake
24592 0x6010 0110000000010000 6010 - 7fff - Mirrors of the sixteen VIA registers
.. .. .. ..
32767 0x7fff 0111111111111111 6010 - 7fff - Mirrors of the sixteen VIA registers
32768 0x8000 1000000000000000 8000 - fff9 = ROM
.. .. .. ..
65529 0xfff9 1111111111111000 8000 - fff9 = ROM
65530 0xfffa 1111111111111010 fffa - fffb = ROM [NMI Vector]
65531 0xfffb 1111111111111010 fffa - fffb = ROM [NMI Vector]
65532 0xfffc 1111111111111100 fffc - fffd = ROM [Reset Vector]
65533 0xfffd 1111111111111100 fffc - fffd = ROM [Reset Vector]
65534 0xfffe 1111111111111110 fffe - ffff = ROM [IRQ/BRK Vector]
65535 0xffff 1111111111111110 fffe - ffff = ROM [IRQ/BRK Vector]
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