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142 lines
7.0 KiB
C
142 lines
7.0 KiB
C
; 7800.h
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; Version 1.0, 2019/12/13
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; This file defines hardware registers and memory mapping for the
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; Atari 7800. It is distributed as a companion machine-specific support package
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; for the DASM compiler. Updates to this file, DASM, and associated tools are
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; available at https://github.com/dasm-assembler/dasm
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; ******************** 7800 Hardware Adresses ***************************
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;
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; MEMORY MAP USAGE OF THE 7800
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;
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; 00 - 1F TIA REGISTERS
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; 20 - 3F MARIA REGISTERS
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; 40 - FF RAM block 0 (zero page)
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; 100 - 11F TIA (mirror of 0000-001f)
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; 120 - 13F MARIA (mirror of 0020-003f)
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; 140 - 1FF RAM block 1 (stack)
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; 200 - 21F TIA (mirror of 0000-001f)
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; 220 - 23F MARIA (mirror of 0020-003f)
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; 240 - 27F ???
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; 280 - 2FF RIOT I/O ports and timers
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; 300 - 31F TIA (mirror of 0000-001f)
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; 320 - 33F MARIA (mirror of 0020-003f)
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; 340 - 3FF ???
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; 400 - 47F unused address space
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; 480 - 4FF RIOT RAM
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; 500 - 57F unused address space
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; 580 - 5FF RIOT RAM (mirror of 0480-04ff)
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; 600 - 17FF unused address space
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; 1800 - 203F RAM
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; 2040 - 20FF RAM block 0 (mirror of 0000-001f)
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; 2100 - 213F RAM
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; 2140 - 21FF RAM block 1 (mirror of 0140-01ff)
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; 2200 - 27FF RAM
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; 2800 - 2FFF mirror of 1800-27ff
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; 3000 - 3FFF unused address space
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; 4000 - FF7F potential cartridge address space
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; FF80 - FFF9 RESERVED FOR ENCRYPTION
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; FFFA - FFFF 6502 VECTORS
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;****** 00-1F ********* TIA REGISTERS ******************
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INPTCTRL = $01 ;Input control. In same address space as TIA. write-only
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VBLANK = $01 ;VBLANK. D7=1:dump paddle caps to ground. write-only
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INPT0 = $08 ;Paddle Control Input 0 read-only
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INPT1 = $09 ;Paddle Control Input 1 read-only
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INPT2 = $0A ;Paddle Control Input 2 read-only
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INPT3 = $0B ;Paddle Control Input 3 read-only
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; ** some common alternate names for INPT0/1/2/3
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INPT4B = $08 ;Joystick 0 Fire 1 read-only
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INPT4A = $09 ;Joystick 0 Fire 1 read-only
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INPT5B = $0A ;Joystick 1 Fire 0 read-only
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INPT5A = $0B ;Joystick 1 Fire 1 read-only
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INPT4R = $08 ;Joystick 0 Fire 1 read-only
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INPT4L = $09 ;Joystick 0 Fire 1 read-only
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INPT5R = $0A ;Joystick 1 Fire 0 read-only
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INPT5L = $0B ;Joystick 1 Fire 1 read-only
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INPT4 = $0C ;Player 0 Fire Button Input read-only
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INPT5 = $0D ;Player 1 Fire Button Input read-only
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AUDC0 = $15 ;Audio Control Channel 0 write-only
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AUDC1 = $16 ;Audio Control Channel 1 write-only
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AUDF0 = $17 ;Audio Frequency Channel 0 write-only
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AUDF1 = $18 ;Audio Frequency Channel 1 write-only
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AUDV0 = $19 ;Audio Volume Channel 0 write-only
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AUDV1 = $1A ;Audio Volume Channel 1 write-only
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;****** 20-3F ********* MARIA REGISTERS ***************
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BACKGRND = $20 ;Background Color write-only
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P0C1 = $21 ;Palette 0 - Color 1 write-only
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P0C2 = $22 ;Palette 0 - Color 2 write-only
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P0C3 = $23 ;Palette 0 - Color 3 write-only
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WSYNC = $24 ;Wait For Sync write-only
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P1C1 = $25 ;Palette 1 - Color 1 write-only
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P1C2 = $26 ;Palette 1 - Color 2 write-only
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P1C3 = $27 ;Palette 1 - Color 3 write-only
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MSTAT = $28 ;Maria Status read-only
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P2C1 = $29 ;Palette 2 - Color 1 write-only
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P2C2 = $2A ;Palette 2 - Color 2 write-only
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P2C3 = $2B ;Palette 2 - Color 3 write-only
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DPPH = $2C ;Display List List Pointer High write-only
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P3C1 = $2D ;Palette 3 - Color 1 write-only
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P3C2 = $2E ;Palette 3 - Color 2 write-only
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P3C3 = $2F ;Palette 3 - Color 3 write-only
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DPPL = $30 ;Display List List Pointer Low write-only
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P4C1 = $31 ;Palette 4 - Color 1 write-only
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P4C2 = $32 ;Palette 4 - Color 2 write-only
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P4C3 = $33 ;Palette 4 - Color 3 write-only
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CHARBASE = $34 ;Character Base Address write-only
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CHBASE = $34 ;Character Base Address write-only
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P5C1 = $35 ;Palette 5 - Color 1 write-only
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P5C2 = $36 ;Palette 5 - Color 2 write-only
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P5C3 = $37 ;Palette 5 - Color 3 write-only
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OFFSET = $38 ;Unused - Store zero here write-only
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P6C1 = $39 ;Palette 6 - Color 1 write-only
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P6C2 = $3A ;Palette 6 - Color 2 write-only
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P6C3 = $3B ;Palette 6 - Color 3 write-only
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CTRL = $3C ;Maria Control Register write-only
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P7C1 = $3D ;Palette 7 - Color 1 write-only
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P7C2 = $3E ;Palette 7 - Color 2 write-only
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P7C3 = $3F ;Palette 7 - Color 3 write-only
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;****** 280-2FF ******* PIA PORTS AND TIMERS ************
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SWCHA = $280 ;P0+P1 Joystick Directional Input read-write
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CTLSWA = $281 ;I/O Control for SCHWA read-write
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SWACNT = $281 ;VCS name for above read-write
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SWCHB = $282 ;Console Switches read-write
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CTLSWB = $283 ;I/O Control for SCHWB read-write
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SWBCNT = $283 ;VCS name for above read-write
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INTIM = $284 ;Iterval Timer Read read-only
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TIM1T = $294 ;Set 1 CLK Interval (838 nsec/interval) write-only
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TIM8T = $295 ;Set 8 CLK Interval (6.7 usec/interval) write-only
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TIM64T = $296 ;Set 64 CLK Interval (63.6 usec/interval) write-only
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T1024T = $297 ;Set 1024 CLK Interval (858.2 usec/interval) write-only
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TIM64TI = $29E ;Interrupt timer 64T write-only
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;XM
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XCTRL = $470 ; 7=YM2151 6=RAM@6k 5=RAM@4k 4=pokey@450 3=hsc 2=cart 1=RoF_bank1 0=RoF_bank2
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; Pokey register relative locations, since its base may be different
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; depending on the hardware.
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PAUDF0 = $0 ; extra audio channels and frequencies
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PAUDC0 = $1
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PAUDF1 = $2
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PAUDC1 = $3
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PAUDF2 = $4
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PAUDC2 = $5
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PAUDF3 = $6
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PAUDC3 = $7
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PAUDCTL = $8 ; Audio Control
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PRANDOM = $A ; 17 bit polycounter pseudo random
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PSKCTL = $F ; Serial Port control
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