[atari7800] 512K Carts in Mess ?
- From: "Andy Mucho" <m00@xxxxxxxxxxxxxxxxxxx>
- To: <atari7800@xxxxxxxxxxxxx>
- Date: Fri, 24 Sep 2004 10:19:01 +0100
Me, again, probably this is painfully obvious, but I can't see..
How on earth can I get a 512K cart to boot in MESS ?
I'm trying something along the lines of this cart configuration:
http://www.atarihq.com/danb/7800cart/C301105.shtml
512K ROM, Pokey, 32 banks of 16K..
The header A78 header is setup correctly, yet MESS just dies on booting up
with an illegal operation ?
The header looks like this, which I think is correct ?
I'm suspecting that it's one of the (Special bits) 8-15 in the cart type
field ? But I've no idea what to plug in there for the above 512K
configuration ?
HEADER:
DC.B 1 ; 0 Header version - 1
byte
DC.B "ATARI7800" ; 1..16 "ATARI7800 " - 16
bytes
DS 7,32 ;
DC.B "Test 23.09.04" ; 17..48 Cart title - 32 bytes
DS HEADER+49-.,0 ;
DC.B $00,$08,$00,$00 ; 49..52 data length - 4 bytes
DC.B $00,$03 ; 53..54 cart type - 2 bytes
; bit 0 - Pokey cart
; bit 1 - Supercart bank switched
; bit 2 - Supercart RAM at $4000
; bit 3 - ROM at $4000
; bit 4 - Bank 6 at $4000
; bit 8-15 - Special
; 0 = Normal cart
DC.B 1 ; 55 controller 1 type - 1
byte
DC.B 1 ; 56 controller 2 type - 1
byte
; 0 = None
; 1 = Joystick
; 2 = Light Gun
DC.B 0 ; 57 0 = NTSC 1 = PAL
ORG HEADER+100 ; 100..127 "ACTUAL CART DATA STARTS
HERE" - 28 bytes
DC.B "ACTUAL CART DATA STARTS HERE"
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