SA1 - Revision history

Dlevere: /* Overview */

2014-09-26T06:26:15Z

Overview

← Older revision		Revision as of 06:26, 26 September 2014
Line 2:		Line 2:
	The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.		The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.

	~~http~~:~~//upload.wikimedia.org/wikipedia/commons/thumb/b/b6/SA1_01.jpg/~~220px-SA1_01.jpg		[[File:220px-SA1_01.jpg]]

	There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.		There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.

Dlevere: /* Overview */

2014-03-24T20:18:35Z

Overview

← Older revision		Revision as of 20:18, 24 March 2014
Line 1:		Line 1:
	== Overview ==		== Overview ==
	The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.		The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.

			http://upload.wikimedia.org/wikipedia/commons/thumb/b/b6/SA1_01.jpg/220px-SA1_01.jpg

	There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.		There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.

Ugetab: Added a new mapping possibility to 'Memory Mapping Comparison'

2010-03-25T05:34:59Z

Added a new mapping possibility to 'Memory Mapping Comparison'

← Older revision		Revision as of 05:34, 25 March 2010
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	00:4000 - 00:7FFF<br>		00:4000 - 00:7FFF<br>
	CPU Address:<br>		CPU Address:<br>
	40:0000 - 40:3FFF		40:0000 - 40:3FFF<br>

			Jikkyuu Oshaberi Parodius has the following in the SNES native CPU as well:<br>
			00:676C writes going to 40:076C<br>

	SA1 Address Testing:<br>		SA1 Address Testing:<br>

MathUser at 18:53, 9 November 2008

2008-11-09T18:53:03Z

← Older revision		Revision as of 18:53, 9 November 2008
Line 40:		Line 40:
	C9C3793F		C9C3793F

	[[Category:~~GSHI pages~~]]		[[Category:Hacking and Game Info]]

MathUser at 15:18, 30 September 2008

2008-09-30T15:18:51Z

← Older revision		Revision as of 15:18, 30 September 2008
Line 39:		Line 39:
	C9C378FF<br>		C9C378FF<br>
	C9C3793F		C9C3793F

			[[Category:GSHI pages]]

Ugetab: /* Memory Mapping Comparison */ (Added STA Z SA1 info)

2008-01-25T20:53:55Z

Memory Mapping Comparison: (Added STA Z SA1 info)

← Older revision		Revision as of 20:53, 25 January 2008
Line 11:		Line 11:
	00:0000 - 00:3FFF<br>		00:0000 - 00:3FFF<br>
	30:0000 - 30:3FFF		30:0000 - 30:3FFF

			SA1 code such as "STA $DE" can access address 00:30DE, and show up in the log file as a line like...<br>
			$C2:D286 85 DE . STA $DE . [$00:00DE]

			The above may not always hold true, but it should be known that not all addresses will appear exactly as expected.<br>

	SA1 Address:		SA1 Address:

Ugetab at 22:26, 6 December 2006

2006-12-06T22:26:05Z

← Older revision		Revision as of 22:26, 6 December 2006
Line 1:		Line 1:
	==Overview==		== Overview ==
	The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.		The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.


	There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.		There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.

	==Memory Mapping Comparison==		== Memory Mapping Comparison ==
	Region 30:0000 - 30:3FFF is SA1 related due to the fact that some RAM is 00 mapped for SA1-using games:		Region 30:0000 - 30:3FFF is SA1 related due to the fact that some RAM is 00 mapped for SA1-using games:

	Writes from the SNES CPU to 00:0000 - 00:3FFF region to change a mirrored region at 30:0000 - 30:3FFF region		Writes from the SNES CPU to 00:0000 - 00:3FFF region to change a mirrored region at 30:0000 - 30:3FFF region

	00:0000 - 00:3FFF		00:0000 - 00:3FFF<br>
	30:0000 - 30:3FFF		30:0000 - 30:3FFF

	SA1 Address:		SA1 Address:
	Reads/Writes to these addresses from the SA1 CPU translate to the below CPU-accessible addresses in SNES memory		Reads/Writes to these addresses from the SA1 CPU translate to the below CPU-accessible addresses in SNES memory<br>
	00:4000 - 00:7FFF		00:4000 - 00:7FFF<br>
	CPU Address:		CPU Address:<br>
	40:0000 - 40:3FFF		40:0000 - 40:3FFF

	SA1 Address Testing:		SA1 Address Testing:<br>
	If you wish to test writes made by the SA1 to memory, and see what area is changed, you can use the following code with Super Mario RPG (US), while in a 3D stage. You should fall through the ground, and be unaligned with the map, but have the value FE written to the address you chose.		If you wish to test writes made by the SA1 to memory, and see what area is changed, you can use the following code with Super Mario RPG (US), while in a 3D stage. You should fall through the ground, and be unaligned with the map, but have the value FE written to the address you chose.

	Test SA1 Memory Writes (2 byte addresses, 0xFE written)		Test SA1 Memory Writes (2 byte addresses, 0xFE written)<br>
	C9C374A9		C9C374A9<br>
	C9C375FE		C9C375FE<br>
	C9C378FF		C9C378FF<br>
	C9C3793F		C9C3793F

	Load value 0x00FE to write(could be made to load a 2-byte value)		Load value 0x00FE to write(could be made to load a 2-byte value)<br>
	C9C374A9		C9C374A9<br>
	C9C375FE		C9C375FE

	Address to write to(Writes to 3FFF with these values)		Address to write to(Writes to 3FFF with these values)<br>
	C9C378FF		C9C378FF<br>
	C9C3793F		C9C3793F

Ugetab at 18:32, 30 November 2006

2006-11-30T18:32:30Z

← Older revision		Revision as of 18:32, 30 November 2006
Line 1:		Line 1:
	==Overview==		==Overview==
	~~----~~
	The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.		The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.


	There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.		There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.

	==Memory Mapping Comparison==		==Memory Mapping Comparison==
	~~----~~
	Region 30:0000 - 30:3FFF is SA1 related due to the fact that some RAM is 00 mapped for SA1-using games:		Region 30:0000 - 30:3FFF is SA1 related due to the fact that some RAM is 00 mapped for SA1-using games:

Line 19:		Line 18:
	CPU Address:		CPU Address:
	40:0000 - 40:3FFF		40:0000 - 40:3FFF


	SA1 Address Testing:		SA1 Address Testing:

Ugetab at 18:30, 30 November 2006

2006-11-30T18:30:22Z

New page

==Overview==
----
The SNES SA1 chip is an expansion chip added to an SNES cart that both contains a portion of the game's coding, and executes that portion of code to affect normal SNES RAM, and the additional RAM accessed primarily by the SA1 chip programming. The additional RAM is also accessible by the SNES CPU's instructions.

There is no current information concerning hardware-based tests with Game Genie codes that change portions of ROM residing within the SA1.

==Memory Mapping Comparison==
----
Region 30:0000 - 30:3FFF is SA1 related due to the fact that some RAM is 00 mapped for SA1-using games:

Writes from the SNES CPU to 00:0000 - 00:3FFF region to change a mirrored region at 30:0000 - 30:3FFF region

00:0000 - 00:3FFF
30:0000 - 30:3FFF

SA1 Address:
Reads/Writes to these addresses from the SA1 CPU translate to the below CPU-accessible addresses in SNES memory
00:4000 - 00:7FFF
CPU Address:
40:0000 - 40:3FFF

SA1 Address Testing:
If you wish to test writes made by the SA1 to memory, and see what area is changed, you can use the following code with Super Mario RPG (US), while in a 3D stage. You should fall through the ground, and be unaligned with the map, but have the value FE written to the address you chose.

Test SA1 Memory Writes (2 byte addresses, 0xFE written)
C9C374A9
C9C375FE
C9C378FF
C9C3793F

Load value 0x00FE to write(could be made to load a 2-byte value)
C9C374A9
C9C375FE

Address to write to(Writes to 3FFF with these values)
C9C378FF
C9C3793F