defines.inc

                        .equ    mode_pin_0,  24
                        .equ    mode_pin_1,  25
                        .equ    wait_pin,    27
                        .equ    i2c_scl_pin, 28
                        .equ    i2c_sda_pin, 29

                        .equ    I2C_ACK,     0
                        .equ    I2C_NAK,     1
                        .equ    I2C_WRITE,   0
                        .equ    I2C_READ,    1

                        .equ    EEPROM_ADDR, $A0

                        .equ    BUS_M1,      %10000000
                        .equ    BUS_RD,      %01000000
                        .equ    BUS_WR,      %00100000
                        .equ    BUS_A1,      %00010000
                        .equ    BUS_A0,      %00001000
                        .equ    BUS_A6,      %00000100
                        .equ    BUS_A2_A7,   %00000010
                        .equ    BUS_IORQ,    %00000001
                        .equ    BUS_PINS,    %11111111

                        .equ    BUS_WAIT,    (1 << wait_pin)

                        .equ    PORT_MASK,   %0000_11_100
                        .equ    PORT_40,     %0000_00_100_00    // $04
                        .equ    PORT_41,     %0000_01_100_00    // $0C
                        .equ    PORT_42,     %0000_10_100_00    // $14
                        .equ    PORT_43,     %0000_11_100_00    // $1C

                        .equ    VRAM_EXPAND_H,  %10000000       // $80 (128)
                        .equ    VRAM_EXPAND_V,  %01000000       // $40 (64)