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Created a target and a library for the Commander X16 prototype computer.

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This commit is contained in:
Greg King
2019-09-27 03:38:51 -04:00
parent 0896deedef
commit 18afc7c703
49 changed files with 2440 additions and 59 deletions
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316
asminc/cx16.inc Normal file
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;
; CX16 definitions
;
; ---------------------------------------------------------------------------
; Constants
.enum COLOR
BLACK = $00
WHITE
RED
CYAN
VIOLET
PURPLE = VIOLET
GREEN
BLUE
YELLOW
ORANGE
BROWN
LIGHTRED
GRAY1
GRAY2
LIGHTGREEN
LIGHTBLUE
GRAY3
.endenum
; Special keys
.enum KEY
F1 = $85
F3
F5
F7
F2
F4
F6
F8
F9 = $10
F10 = $15
F11
F12
.endenum
; ---------------------------------------------------------------------------
; Zero page
; BASIC
VARTAB := $2D ; Pointer to start of BASIC variables
MEMSIZE := $37 ; Pointer to highest BASIC RAM location (+1)
TXTPTR := $7A ; Pointer into BASIC source code
; Kernal
IN_DEV := $99 ; Current input device number
OUT_DEV := $9A ; Current output device number
IMPARM := $9B ; Pointer for PRIMM function
TIME := $A0 ; 60 Hz. clock
FNAM_LEN := $B7 ; Length of filename
SECADR := $B9 ; Secondary address
DEVNUM := $BA ; Device number
FNAM := $BB ; Pointer to filename
KEY_COUNT := $C6 ; Number of keys in input buffer
RVS := $C7 ; Reverse flag
CURS_FLAG := $CC ; 1 = cursor off
CURS_BLINK := $CD ; Blink counter
CURS_CHAR := $CE ; Character under the cursor
CURS_STATE := $CF ; Cursor blink state
SCREEN_PTR := $D1 ; Pointer to current row on text screen (16 bits)
CURS_X := $D3 ; Cursor column
CURS_Y := $D6 ; Cursor row
LLEN := $D9 ; Line length
NLINES := $DA ; Number of screen lines
JOY1 := $EF ; 3 bytes of NES/SNES gamepad data
JOY2 := $F2
FREKZP := $FB ; Five unused bytes
; Page two
BASIC_BUF := $200 ; Location of command-line
BASIC_BUF_LEN = 89 ; Maximum length of command-line
CHARCOLOR := $286
CURS_COLOR := $287 ; Color under the cursor
; ---------------------------------------------------------------------------
; Vector and other locations
IRQVec := $0314
BRKVec := $0316
NMIVec := $0318
; ---------------------------------------------------------------------------
; I/O locations
; Video Enhanced Retro Adapter
; Has audio, SPI, and UART.
.scope VERA
; External registers
.struct
.org $9F20
ADDR .faraddr ; Address for data port access
DATA0 .byte ; First data port
DATA1 .byte ; Second data port
CTRL .byte ; Control register
IRQ_EN .byte ; Interrupt enable bits
IRQ_FLAGS .byte ; Interrupt flags
.endstruct
.enum ; Address automatic increment amounts
INC0 = 0 << 4
INC1 = 1 << 4
INC2 = 2 << 4
INC4 = 3 << 4
INC8 = 4 << 4
INC16 = 5 << 4
INC32 = 6 << 4
INC64 = 7 << 4
INC128 = 8 << 4
INC256 = 9 << 4
INC512 = 10 << 4
INC1024 = 11 << 4
INC2048 = 12 << 4
INC4096 = 13 << 4
INC8192 = 14 << 4
INC16384 = 15 << 4
.endenum
; Internal RAM and registers
VRAM := $000000
.scope COMPOSER ; Display composer
.struct
.org $0F0000
VIDEO .byte
HSCALE .byte
VSCALE .byte
FRAME .byte
HSTART_LO .byte
HSTOP_LO .byte
VSTART_LO .byte
VSTOP_LO .byte
STRTSTOP_HI .byte
IRQ_LINE .word
.endstruct
.enum MODE ; Output mode
DISABLE = 0
VGA
NTSC
RGB ; Interlaced, composite sync
.endenum
.enum
ENABLE_COLOR = 0 << 2
DISABLE_COLOR = 1 << 2 ; NTSC monochrome
.endenum
.endscope
PALETTE := $0F1000
.struct L0 ; Layer 0 registers
.org $0F2000
CTRL0 .byte ; Display mode control
CTRL1 .byte ; Geometry control
MAP_BASE .addr
TILE_BASE .addr
HSCROLL .word ; Horizontal scroll
VSCROLL .word ; Vertical scroll
.endstruct
.struct L1 ; Layer 1 registers (same as layer 0)
.org $0F3000
CTRL0 .byte
CTRL1 .byte
MAP_BASE .addr
TILE_BASE .addr
HSCROLL .word
VSCROLL .word
.endstruct
.enum MAP ; Map geometry
WIDTH32 = 0
WIDTH64
WIDTH128
WIDTH256
HEIGHT32 = 0 << 2
HEIGHT64 = 1 << 2
HEIGHT128 = 2 << 2
HEIGHT256 = 3 << 2
.endenum
.scope TILE ; Tile geometry
.enum
WIDTH8 = 0 << 4
WIDTH16 = 1 << 4
WIDTH320 = WIDTH8
WIDTH640 = WIDTH16
HEIGHT8 = 0 << 5
HEIGHT16 = 1 << 5
.endenum
.enum FLIP
NONE = 0 << 2
HORIZ = 1 << 2
VERT = 2 << 2
BOTH = 3 << 2
.endenum
.endscope
.enum DMODE ; Display modes
TEXT16 = 0 << 5
TEXT256 = 1 << 5
TILE4 = 2 << 5
TILE16 = 3 << 5
TILE256 = 4 << 5
BITMAP4 = 5 << 5
BITMAP16 = 6 << 5
BITMAP256 = 7 << 5
.endenum
.scope SPRITE
.struct
.org $0F4000
CTRL .byte ; Enables sprites
COLLISION .byte
.endstruct
.enum FLIP
NONE = 0
HORIZ
VERT
BOTH
.endenum
.enum ; Sprite geometry
WIDTH8 = 0 << 4
WIDTH16 = 1 << 4
WIDTH32 = 2 << 4
WIDTH64 = 3 << 4
HEIGHT8 = 0 << 6
HEIGHT16 = 1 << 6
HEIGHT32 = 2 << 6
HEIGHT64 = 3 << 6
COLORS16 = 0 << 7
COLORS256 = 1 << 7
.endenum
.enum DEPTH
DISABLE = 0 << 2
CANVAS = 1 << 2
LAYER0 = 2 << 2
LAYER1 = 3 << 2
.endenum
ATTRIB := $0F5000 ; Sprite attributes
.endscope
AUDIO := $0F6000
.scope SPI
.struct
.org $0F7000
DATA .byte
CONTROL .byte
.endstruct
.enum
DESELECT = 0
SELECT
BUSY_MASK = 1 << 1
.endenum
.endscope
.scope UART ; Universal Asyncronous Receiver Transmitter
.struct
.org $0F8000
DATA .byte
STATUS .byte
BPS_DIV .word
.endstruct
.enum MASK
RECEIVE = 1 << 0
TRANSMIT = 1 << 1
.endenum
.endscope
.endscope
; 65c22
.struct VIA1 ; Versatile Interface Adapter
.org $9F60
PRB .byte ; ROM bank, IEC (Port Register B)
PRA .byte ; RAM bank (Port Register A)
DDRB .byte ; (Data Direction Register B)
DDRA .byte ; (Data Direction Register A)
T1 .word ; (Timer 1)
T1L .word ; (Timer 1 Latch)
T2 .word ; (Timer 2)
SR .byte ; (Shift Register)
ACR .byte ; (Auxiliary Control Register)
PCR .byte ; (Peripheral Control Register)
IFR .byte ; (Interrupt Flags Register)
IER .byte ; (Interrupt Enable Register)
PRA2 .byte ; RAM bank (Port Register A without handshaking)
.endstruct
; 65c22
.struct VIA2
.org $9F70
PRB .byte
PRA .byte ; NES controller communication
DDRB .byte
DDRA .byte
T1 .word
T1L .word
T2 .word
SR .byte
ACR .byte
PCR .byte
IFR .byte
IER .byte
PRA2 .byte
.endstruct
; Real-Time Clock
; X16 Emulator device
; This device doesn't exist on the real machine.
.struct EMULATOR
.org $9FB0
DEBUG .byte ; Boolean: debugging enabled
VIDACCESSLOG .byte ; Boolean: log VERA activity
KEYBOARDLOG .byte ; Boolean: log keyboard data
ECHO .byte ; Boolean: echo enabled
SAVEXIT .byte ; Boolean: save on exit
.res $D - $5
KEYMAP .byte ; Current keyboard layout number
DETECT .byte 2 ; If is "16" string, then running on emulator
.endstruct