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