2019-09-27 07:38:51 +00:00
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; CX16 definitions
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;
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; ---------------------------------------------------------------------------
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; Constants
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.enum COLOR
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BLACK = $00
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WHITE
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RED
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CYAN
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VIOLET
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PURPLE = VIOLET
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GREEN
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BLUE
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YELLOW
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ORANGE
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BROWN
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LIGHTRED
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GRAY1
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GRAY2
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LIGHTGREEN
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LIGHTBLUE
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GRAY3
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.endenum
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; Special keys
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.enum KEY
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F1 = $85
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F3
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F5
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F7
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F2
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F4
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F6
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F8
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F9 = $10
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F10 = $15
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F11
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F12
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.endenum
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; ---------------------------------------------------------------------------
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; Zero page
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; BASIC
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VARTAB := $2D ; Pointer to start of BASIC variables
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MEMSIZE := $37 ; Pointer to highest BASIC RAM location (+1)
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TXTPTR := $7A ; Pointer into BASIC source code
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; Kernal
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IN_DEV := $99 ; Current input device number
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OUT_DEV := $9A ; Current output device number
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IMPARM := $9B ; Pointer for PRIMM function
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TIME := $A0 ; 60 Hz. clock
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FNAM_LEN := $B7 ; Length of filename
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SECADR := $B9 ; Secondary address
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DEVNUM := $BA ; Device number
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FNAM := $BB ; Pointer to filename
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KEY_COUNT := $C6 ; Number of keys in input buffer
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RVS := $C7 ; Reverse flag
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CURS_FLAG := $CC ; 1 = cursor off
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CURS_BLINK := $CD ; Blink counter
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CURS_CHAR := $CE ; Character under the cursor
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CURS_STATE := $CF ; Cursor blink state
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SCREEN_PTR := $D1 ; Pointer to current row on text screen (16 bits)
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CURS_X := $D3 ; Cursor column
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CURS_Y := $D6 ; Cursor row
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LLEN := $D9 ; Line length
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NLINES := $DA ; Number of screen lines
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JOY1 := $EF ; 3 bytes of NES/SNES gamepad data
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JOY2 := $F2
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FREKZP := $FB ; Five unused bytes
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; Page two
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BASIC_BUF := $200 ; Location of command-line
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BASIC_BUF_LEN = 89 ; Maximum length of command-line
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CHARCOLOR := $286
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CURS_COLOR := $287 ; Color under the cursor
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; ---------------------------------------------------------------------------
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; Vector and other locations
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IRQVec := $0314
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BRKVec := $0316
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NMIVec := $0318
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; ---------------------------------------------------------------------------
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; I/O locations
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; Video Enhanced Retro Adapter
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; Has audio, SPI, and UART.
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.scope VERA
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; External registers
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.struct
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.org $9F20
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ADDR .faraddr ; Address for data port access
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DATA0 .byte ; First data port
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DATA1 .byte ; Second data port
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CTRL .byte ; Control register
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IRQ_EN .byte ; Interrupt enable bits
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IRQ_FLAGS .byte ; Interrupt flags
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.endstruct
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.enum ; Address automatic increment amounts
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INC0 = 0 << 4
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INC1 = 1 << 4
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INC2 = 2 << 4
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INC4 = 3 << 4
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INC8 = 4 << 4
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INC16 = 5 << 4
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INC32 = 6 << 4
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INC64 = 7 << 4
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INC128 = 8 << 4
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INC256 = 9 << 4
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INC512 = 10 << 4
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INC1024 = 11 << 4
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INC2048 = 12 << 4
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INC4096 = 13 << 4
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INC8192 = 14 << 4
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INC16384 = 15 << 4
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.endenum
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; Internal RAM and registers
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VRAM := $000000
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.scope COMPOSER ; Display composer
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.struct
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.org $0F0000
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VIDEO .byte
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HSCALE .byte
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VSCALE .byte
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FRAME .byte
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HSTART_LO .byte
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HSTOP_LO .byte
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VSTART_LO .byte
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VSTOP_LO .byte
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STRTSTOP_HI .byte
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IRQ_LINE .word
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.endstruct
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.enum MODE ; Output mode
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DISABLE = 0
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VGA
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NTSC
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RGB ; Interlaced, composite sync
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.endenum
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.enum
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ENABLE_COLOR = 0 << 2
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DISABLE_COLOR = 1 << 2 ; NTSC monochrome
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.endenum
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.endscope
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PALETTE := $0F1000
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.struct L0 ; Layer 0 registers
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.org $0F2000
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CTRL0 .byte ; Display mode control
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CTRL1 .byte ; Geometry control
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MAP_BASE .addr
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TILE_BASE .addr
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HSCROLL .word ; Horizontal scroll
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VSCROLL .word ; Vertical scroll
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.endstruct
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.struct L1 ; Layer 1 registers (same as layer 0)
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.org $0F3000
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CTRL0 .byte
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CTRL1 .byte
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MAP_BASE .addr
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TILE_BASE .addr
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HSCROLL .word
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VSCROLL .word
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.endstruct
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.enum MAP ; Map geometry
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WIDTH32 = 0
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WIDTH64
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WIDTH128
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WIDTH256
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HEIGHT32 = 0 << 2
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HEIGHT64 = 1 << 2
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HEIGHT128 = 2 << 2
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HEIGHT256 = 3 << 2
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.endenum
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.scope TILE ; Tile geometry
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.enum
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WIDTH8 = 0 << 4
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WIDTH16 = 1 << 4
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WIDTH320 = WIDTH8
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WIDTH640 = WIDTH16
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HEIGHT8 = 0 << 5
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HEIGHT16 = 1 << 5
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.endenum
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.enum FLIP
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NONE = 0 << 2
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HORIZ = 1 << 2
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VERT = 2 << 2
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BOTH = 3 << 2
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.endenum
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.endscope
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.enum DMODE ; Display modes
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TEXT16 = 0 << 5
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TEXT256 = 1 << 5
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TILE4 = 2 << 5
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TILE16 = 3 << 5
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TILE256 = 4 << 5
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BITMAP4 = 5 << 5
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BITMAP16 = 6 << 5
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BITMAP256 = 7 << 5
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.endenum
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.scope SPRITE
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.struct
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.org $0F4000
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CTRL .byte ; Enables sprites
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COLLISION .byte
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.endstruct
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.enum FLIP
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NONE = 0
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HORIZ
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VERT
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BOTH
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.endenum
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.enum ; Sprite geometry
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WIDTH8 = 0 << 4
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WIDTH16 = 1 << 4
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WIDTH32 = 2 << 4
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WIDTH64 = 3 << 4
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HEIGHT8 = 0 << 6
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HEIGHT16 = 1 << 6
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HEIGHT32 = 2 << 6
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HEIGHT64 = 3 << 6
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COLORS16 = 0 << 7
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COLORS256 = 1 << 7
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.endenum
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.enum DEPTH
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DISABLE = 0 << 2
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CANVAS = 1 << 2
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LAYER0 = 2 << 2
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LAYER1 = 3 << 2
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.endenum
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ATTRIB := $0F5000 ; Sprite attributes
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.endscope
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AUDIO := $0F6000
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.scope SPI
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.struct
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.org $0F7000
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DATA .byte
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CONTROL .byte
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.endstruct
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.enum
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DESELECT = 0
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SELECT
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BUSY_MASK = 1 << 1
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.endenum
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.endscope
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.scope UART ; Universal Asyncronous Receiver Transmitter
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.struct
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.org $0F8000
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DATA .byte
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STATUS .byte
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BPS_DIV .word
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.endstruct
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.enum MASK
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RECEIVE = 1 << 0
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TRANSMIT = 1 << 1
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.endenum
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.endscope
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.endscope
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; 65c22
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.struct VIA1 ; Versatile Interface Adapter
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.org $9F60
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PRB .byte ; ROM bank, IEC (Port Register B)
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PRA .byte ; RAM bank (Port Register A)
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DDRB .byte ; (Data Direction Register B)
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DDRA .byte ; (Data Direction Register A)
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T1 .word ; (Timer 1)
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T1L .word ; (Timer 1 Latch)
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T2 .word ; (Timer 2)
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SR .byte ; (Shift Register)
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ACR .byte ; (Auxiliary Control Register)
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PCR .byte ; (Peripheral Control Register)
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IFR .byte ; (Interrupt Flags Register)
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IER .byte ; (Interrupt Enable Register)
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PRA2 .byte ; RAM bank (Port Register A without handshaking)
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.endstruct
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; 65c22
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.struct VIA2
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.org $9F70
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PRB .byte
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2019-10-15 16:10:34 +00:00
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PRA .byte ; NES controller communication
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2019-09-27 07:38:51 +00:00
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DDRB .byte
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DDRA .byte
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T1 .word
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T1L .word
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T2 .word
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SR .byte
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ACR .byte
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PCR .byte
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IFR .byte
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IER .byte
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PRA2 .byte
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.endstruct
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; Real-Time Clock
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; X16 Emulator device
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; This device doesn't exist on the real machine.
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.struct EMULATOR
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.org $9FB0
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DEBUG .byte ; Boolean: debugging enabled
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2019-10-15 16:10:34 +00:00
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VERALOG .byte ; Boolean: log VERA activity
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2019-09-27 07:38:51 +00:00
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KEYBOARDLOG .byte ; Boolean: log keyboard data
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2019-10-15 16:10:34 +00:00
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ECHO .byte ; Type of echo that's enabled
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2019-09-27 07:38:51 +00:00
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SAVEXIT .byte ; Boolean: save on exit
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2019-10-15 16:10:34 +00:00
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GIFREC .byte ; Method of recording GIF movie
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.org $9FBD
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KEYMAP .byte ; Current keyboard layout number (Read-Only)
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DETECT .byte 2 ; If is "16" string, then running on emulator (RO)
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2019-09-27 07:38:51 +00:00
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.endstruct
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