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vcs.h
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; VCS.H
; Version 1.05, 13/November/2003
VERSION_VCS = 105
; THIS IS A PRELIMINARY RELEASE OF *THE* "STANDARD" VCS.H
; THIS FILE IS EXPLICITLY SUPPORTED AS A DASM-PREFERRED COMPANION FILE
; PLEASE DO *NOT* REDISTRIBUTE THIS FILE!
;
; This file defines hardware registers and memory mapping for the
; Atari 2600. 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 at http://www.atari2600.org/dasm
;
; Many thanks to the original author(s) of this file, and to everyone who has
; contributed to understanding the Atari 2600. If you take issue with the
; contents, or naming of registers, please write to me (atari2600@taswegian.com)
; with your views. Please contribute, if you think you can improve this
; file!
;
; Latest Revisions...
; 1.05 13/NOV/2003 - Correction to 1.04 - now functions as requested by MR.
; - Added VERSION_VCS equate (which will reflect 100x version #)
; This will allow conditional code to verify VCS.H being
; used for code assembly.
; 1.04 12/NOV/2003 Added TIA_BASE_WRITE_ADDRESS and TIA_BASE_READ_ADDRESS for
; convenient disassembly/reassembly compatibility for hardware
; mirrored reading/writing differences. This is more a
; readability issue, and binary compatibility with disassembled
; and reassembled sources. Per Manuel Rotschkar's suggestion.
; 1.03 12/MAY/2003 Added SEG segment at end of file to fix old-code compatibility
; which was broken by the use of segments in this file, as
; reported by Manuel Polik on [stella] 11/MAY/2003
; 1.02 22/MAR/2003 Added TIMINT($285)
; 1.01 Constant offset added to allow use for 3F-style bankswitching
; - define TIA_BASE_ADDRESS as $40 for Tigervision carts, otherwise
; it is safe to leave it undefined, and the base address will
; be set to 0. Thanks to Eckhard Stolberg for the suggestion.
; Note, may use -DLABEL=EXPRESSION to define TIA_BASE_ADDRESS
; - register definitions are now generated through assignment
; in uninitialised segments. This allows a changeable base
; address architecture.
; 1.0 22/MAR/2003 Initial release
;-------------------------------------------------------------------------------
; TIA_BASE_ADDRESS
; The TIA_BASE_ADDRESS defines the base address of access to TIA registers.
; Normally 0, the base address should (externally, before including this file)
; be set to $40 when creating 3F-bankswitched (and other?) cartridges.
; The reason is that this bankswitching scheme treats any access to locations
; < $40 as a bankswitch.
IFNCONST TIA_BASE_ADDRESS
TIA_BASE_ADDRESS = 0
ENDIF
; Note: The address may be defined on the command-line using the -D switch, eg:
; dasm.exe code.asm -DTIA_BASE_ADDRESS=$40 -f3 -v5 -ocode.bin
; *OR* by declaring the label before including this file, eg:
; TIA_BASE_ADDRESS = $40
; include "vcs.h"
; Alternate read/write address capability - allows for some disassembly compatibility
; usage ; to allow reassembly to binary perfect copies). This is essentially catering
; for the mirrored ROM hardware registers.
; Usage: As per above, define the TIA_BASE_READ_ADDRESS and/or TIA_BASE_WRITE_ADDRESS
; using the -D command-line switch, as required. If the addresses are not defined,
; they defaut to the TIA_BASE_ADDRESS.
IFNCONST TIA_BASE_READ_ADDRESS
TIA_BASE_READ_ADDRESS = TIA_BASE_ADDRESS
ENDIF
IFNCONST TIA_BASE_WRITE_ADDRESS
TIA_BASE_WRITE_ADDRESS = TIA_BASE_ADDRESS
ENDIF
;-------------------------------------------------------------------------------
SEG.U TIA_REGISTERS_WRITE
ORG TIA_BASE_WRITE_ADDRESS
; DO NOT CHANGE THE RELATIVE ORDERING OF REGISTERS!
VSYNC ds 1 ; $00 0000 00x0 Vertical Sync Set-Clear
VBLANK ds 1 ; $01 xx00 00x0 Vertical Blank Set-Clear
WSYNC ds 1 ; $02 ---- ---- Wait for Horizontal Blank
RSYNC ds 1 ; $03 ---- ---- Reset Horizontal Sync Counter
NUSIZ0 ds 1 ; $04 00xx 0xxx Number-Size player/missle 0
NUSIZ1 ds 1 ; $05 00xx 0xxx Number-Size player/missle 1
COLUP0 ds 1 ; $06 xxxx xxx0 Color-Luminance Player 0
COLUP1 ds 1 ; $07 xxxx xxx0 Color-Luminance Player 1
COLUPF ds 1 ; $08 xxxx xxx0 Color-Luminance Playfield
COLUBK ds 1 ; $09 xxxx xxx0 Color-Luminance Background
CTRLPF ds 1 ; $0A 00xx 0xxx Control Playfield, Ball, Collisions
REFP0 ds 1 ; $0B 0000 x000 Reflection Player 0
REFP1 ds 1 ; $0C 0000 x000 Reflection Player 1
PF0 ds 1 ; $0D xxxx 0000 Playfield Register Byte 0
PF1 ds 1 ; $0E xxxx xxxx Playfield Register Byte 1
PF2 ds 1 ; $0F xxxx xxxx Playfield Register Byte 2
RESP0 ds 1 ; $10 ---- ---- Reset Player 0
RESP1 ds 1 ; $11 ---- ---- Reset Player 1
RESM0 ds 1 ; $12 ---- ---- Reset Missle 0
RESM1 ds 1 ; $13 ---- ---- Reset Missle 1
RESBL ds 1 ; $14 ---- ---- Reset Ball
AUDC0 ds 1 ; $15 0000 xxxx Audio Control 0
AUDC1 ds 1 ; $16 0000 xxxx Audio Control 1
AUDF0 ds 1 ; $17 000x xxxx Audio Frequency 0
AUDF1 ds 1 ; $18 000x xxxx Audio Frequency 1
AUDV0 ds 1 ; $19 0000 xxxx Audio Volume 0
AUDV1 ds 1 ; $1A 0000 xxxx Audio Volume 1
GRP0 ds 1 ; $1B xxxx xxxx Graphics Register Player 0
GRP1 ds 1 ; $1C xxxx xxxx Graphics Register Player 1
ENAM0 ds 1 ; $1D 0000 00x0 Graphics Enable Missle 0
ENAM1 ds 1 ; $1E 0000 00x0 Graphics Enable Missle 1
ENABL ds 1 ; $1F 0000 00x0 Graphics Enable Ball
HMP0 ds 1 ; $20 xxxx 0000 Horizontal Motion Player 0
HMP1 ds 1 ; $21 xxxx 0000 Horizontal Motion Player 1
HMM0 ds 1 ; $22 xxxx 0000 Horizontal Motion Missle 0
HMM1 ds 1 ; $23 xxxx 0000 Horizontal Motion Missle 1
HMBL ds 1 ; $24 xxxx 0000 Horizontal Motion Ball
VDELP0 ds 1 ; $25 0000 000x Vertical Delay Player 0
VDELP1 ds 1 ; $26 0000 000x Vertical Delay Player 1
VDELBL ds 1 ; $27 0000 000x Vertical Delay Ball
RESMP0 ds 1 ; $28 0000 00x0 Reset Missle 0 to Player 0
RESMP1 ds 1 ; $29 0000 00x0 Reset Missle 1 to Player 1
HMOVE ds 1 ; $2A ---- ---- Apply Horizontal Motion
HMCLR ds 1 ; $2B ---- ---- Clear Horizontal Move Registers
CXCLR ds 1 ; $2C ---- ---- Clear Collision Latches
;-------------------------------------------------------------------------------
SEG.U TIA_REGISTERS_READ
ORG TIA_BASE_READ_ADDRESS
; bit 7 bit 6
CXM0P ds 1 ; $00 xx00 0000 Read Collision M0-P1 M0-P0
CXM1P ds 1 ; $01 xx00 0000 M1-P0 M1-P1
CXP0FB ds 1 ; $02 xx00 0000 P0-PF P0-BL
CXP1FB ds 1 ; $03 xx00 0000 P1-PF P1-BL
CXM0FB ds 1 ; $04 xx00 0000 M0-PF M0-BL
CXM1FB ds 1 ; $05 xx00 0000 M1-PF M1-BL
CXBLPF ds 1 ; $06 x000 0000 BL-PF -----
CXPPMM ds 1 ; $07 xx00 0000 P0-P1 M0-M1
INPT0 ds 1 ; $08 x000 0000 Read Pot Port 0
INPT1 ds 1 ; $09 x000 0000 Read Pot Port 1
INPT2 ds 1 ; $0A x000 0000 Read Pot Port 2
INPT3 ds 1 ; $0B x000 0000 Read Pot Port 3
INPT4 ds 1 ; $0C x000 0000 Read Input (Trigger) 0
INPT5 ds 1 ; $0D x000 0000 Read Input (Trigger) 1
;-------------------------------------------------------------------------------
SEG.U RIOT
ORG $280
; RIOT MEMORY MAP
SWCHA ds 1 ; $280 Port A data register for joysticks:
; Bits 4-7 for player 1. Bits 0-3 for player 2.
SWACNT ds 1 ; $281 Port A data direction register (DDR)
SWCHB ds 1 ; $282 Port B data (console switches)
SWBCNT ds 1 ; $283 Port B DDR
INTIM ds 1 ; $284 Timer output
TIMINT ds 1 ; $285
; Unused/undefined registers ($285-$294)
ds 1 ; $286
ds 1 ; $287
ds 1 ; $288
ds 1 ; $289
ds 1 ; $28A
ds 1 ; $28B
ds 1 ; $28C
ds 1 ; $28D
ds 1 ; $28E
ds 1 ; $28F
ds 1 ; $290
ds 1 ; $291
ds 1 ; $292
ds 1 ; $293
TIM1T ds 1 ; $294 set 1 clock interval
TIM8T ds 1 ; $295 set 8 clock interval
TIM64T ds 1 ; $296 set 64 clock interval
T1024T ds 1 ; $297 set 1024 clock interval
;-------------------------------------------------------------------------------
; The following required for back-compatibility with code which does not use
; segments.
SEG
; EOF