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Some tech specs for the Atari that were useful for me
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Dave Bernazzani
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techdocs/HSC-7800.png
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BIN
techdocs/HSC-7800.png
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192
techdocs/a78header.asm
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192
techdocs/a78header.asm
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@ -0,0 +1,192 @@
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; A78 Header v4.2
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;
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; Use this file to add an a78 header via the source code of your ROM.
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;
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; _Implementation Notes_
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;
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; * Include this header near the beginning of your DASM source, but after
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; your initial ROM ORG statement.
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; * Change the fields withn the file to describe your game's hardware
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; requirements to emulators and flash carts.
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; * All unused/reserved bits and bytes must be set to zero.
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.ROMSIZE = $20000 ; Update with your total ROM size.
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; Uncomment the following entry to force older v3 style headers.
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;V3ONLY = 1
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; Uncomment the following entry to break support with platforms that only
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; have v3 headers implemented.
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;V4ONLY = 1
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; Auto-header ROM allocation follows. If the current address is page aligned,
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; we backup 128 bytes. This may cause issues if you use a different ORG+RORG
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; at the start of your ROM - in that case, account for the 128 bytes of
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; header within your game ROM start ORG+RORG statements.
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if ( . & $FF ) = 0 ; Check if we're at an even page.
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ORG (. - 128),0 ; If so, go -128 bytes, for header space.
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else
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ORG .,0 ; In case zero-fill wasn't specified
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endif ; orginally.
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SEG ROM
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.HEADER = .
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; Format detection - do not modify.
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#ifconst V3ONLY
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DC.B 3 ; 0 header major version
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#else
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DC.B 4 ; 0 header major version
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#endif ; V3ONLY
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DC.B "ATARI7800" ; 1..16 header magic string - zero pad
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ORG .HEADER+$11,0
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DC.B "Game Name Here" ; 17..48 cartridge title string - zero pad
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ORG .HEADER+$31,0
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DC.B (.ROMSIZE>>24) ; 49..52 cartridge ROM size
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DC.B (.ROMSIZE>>16&$FF)
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DC.B (.ROMSIZE>>8&$FF)
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DC.B (.ROMSIZE&$FF)
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#ifnconst V4ONLY
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; The following 2 cartridge type bytes are deprecated as of header v4.0.
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; It's recommended that you still populate these bytes for support with
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; platforms that don't yet support v4.
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DC.B %00000000 ; 53 cartridge type A
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DC.B %00000000 ; 54 cartridge type B
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; _Cartridge Type A_
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; bit 7 ; POKEY @ $0800 - $080F
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; bit 6 ; EXRAM/M2 (halt banked RAM)
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; bit 5 ; BANKSET
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; bit 4 ; SOUPER
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; bit 3 ; YM2151 @ $0460 - $0461
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; bit 2 ; POKEY @ $0440 - $044F
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; bit 1 ; ABSOLUTE
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; bit 0 ; ACTIVISION
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; _Cartridge Type B_
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; bit 7 ; EXRAM/A8 (mirror RAM)
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; bit 6 ; POKEY @ $0450 - $045F
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; bit 5 ; EXRAM/X2 (hotspot banked RAM)
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; bit 4 ; EXFIX (2nd last bank @ $4000)
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; bit 3 ; EXROM (ROM @ $4000)
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; bit 2 ; EXRAM (RAM @ $4000)
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; bit 1 ; SUPERGAME
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; bit 0 ; POKEY @ $4000 - $7FFF
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#else
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DC.B %11111111
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DC.B %11111111
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#endif ; !V4ONLY
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DC.B 1 ; 55 controller 1 device type
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DC.B 1 ; 56 controller 2 device type
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; 0 = none
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; 1 = 7800 joystick
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; 2 = lightgun
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; 3 = paddle
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; 4 = trakball
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; 5 = 2600 joystick
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; 6 = 2600 driving
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; 7 = 2600 keypad
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; 8 = ST mouse
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; 9 = Amiga mouse
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; 10 = AtariVox
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; 11 = SNES2Atari
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; 12 = Mega7800
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DC.B %00000000 ; 57 tv type
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; bits 7..3 ; reserved
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; bit 2 ; 0:single-region,1:multi-region
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; bit 1 ; 0:component,1:composite
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; bit 0 ; 0:NTSC,1:PAL
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DC.B %00000000 ; 58 save peripheral
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; bits 7..2 ; reserved
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; bit 1 ; SaveKey/AtariVox
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; bit 0 ; High Score Cart (HSC)
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; The following irq source byte is deprecated as of header v4.0.
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; It's recommended that you still populate this byte for support with
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; platforms that don't yet support v4.
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ORG .HEADER+62,0
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DC.B %00000000 ; 62 external irq source
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; bits 7..5 ; reserved
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; bit 4 ; POKEY @ $0800 - $080F
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; bit 3 ; YM2151 @ $0460 - $0461
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; bit 2 ; POKEY @ $0440 - $044F
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; bit 1 ; POKEY @ $0450 - $045F
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; bit 0 ; POKEY @ $4000 - $7FFF
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DC.B %00000000 ; 63 slot passthrough device
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; bits 7..1 ; reserved
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; bit 0 ; XM module
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#ifnconst V3ONLY
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; The following 6 bytes are v4 header specific. You should populate
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; them with valid info if you're not using V3ONLY, because they will
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; take precedence over v3 headers.
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DC.B 0 ; 64 mapper
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; 0 = linear
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; 1 = supergame
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; 2 = activision
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; 3 = absolute
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; 4 = souper
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DC.B 0 ; 65 mapper options
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; linear_
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; bit 7 ; bankset rom
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; bits 0-1 ; option @4000...
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; 0 = none
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; 1 = 16K EXRAM
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; 2 = 8K EXRAM/A8
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; 3 = 32K EXRAM/M2
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; supergame_
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; bit 7 ; bankset rom
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; bits 0-2 ; option @4000...
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; 0 = none
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; 1 = 16K EXRAM
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; 2 = 8K EXRAM/A8
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; 3 = 32K EXRAM/M2
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; 4 = 16K EXROM
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; 5 = EXFIX
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; 6 = 32K EXRAM/X2
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DC.B %00000000 ; 66 audio hi
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DC.B %00000000 ; 67 audio lo
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; bit 5 ; adpcm@420
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; bit 4 ; covox@430
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; bit 3 ; ym2151@460
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; bits 0-2 ; pokey...
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; 0 = none
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; 1 = pokey@440
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; 2 = pokey@450
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; 3 = dual pokey @440+@450
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; 4 = pokey@800
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; 5 = pokey@4000
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DC.B %00000000 ; 68 interrupt hi
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DC.B %00000000 ; 69 interrupt lo
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; bit 2 ; YM2151
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; bit 1 ; pokey 2 (@440)
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; bit 0 ; pokey 1 (@4000, @450, or @800)
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#endif ; !V3ONLY
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ORG .HEADER+100,0 ; 100..127 footer magic string
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DC.B "ACTUAL CART DATA STARTS HERE"
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