Addresses - Revision history

GlitterBerri: /* Segment Address Table */

2017-12-08T07:37:27Z

‎Segment Address Table

GlitterBerri: /* Segment Address Table */

2017-12-08T07:14:33Z

‎Segment Address Table

GlitterBerri: /* Segment Address Table */

2017-12-08T07:04:47Z

‎Segment Address Table

Mzxrules: /* Bank Offsets */

2017-05-19T13:57:42Z

‎Bank Offsets

Einstein95: /* Bank Offsets */

2015-11-11T11:47:40Z

‎Bank Offsets

Einstein95: /* Bank Offsets */ title_static's texture calls are to bank 01

2015-10-26T07:22:37Z

‎Bank Offsets: title_static's texture calls are to bank 01

Mzxrules at 10:42, 12 February 2015

2015-02-12T10:42:39Z

Mzxrules: Created page with "{{article link|Addresses}} {{todo|write an intro}} == ROM == ROM is an acronym for Read-Only Memory, or memory that cannot be modified. ROM addresses do not start with a spec..."

2015-02-12T10:40:19Z

Created page with "{{article link|Addresses}} {{todo|write an intro}} == ROM == ROM is an acronym for Read-Only Memory, or memory that cannot be modified. ROM addresses do not start with a spec..."

New page

{{article link|Addresses}}
{{todo|write an intro}}

== ROM ==
ROM is an acronym for Read-Only Memory, or memory that cannot be modified. ROM addresses do not start with a special prefix, since they are able to address more than 16 MiB of space.

N64 games typically take up either 16 or 32 MiB of ROM, and rarely 64 MiB of ROM. Dev flash carts (which are re-writable) are 256 MiB in size.

Commercial releases of Ocarina of Time have a maximum capacity of 32 MiB, while the Debug Rom is 64 MiB.

== VROM ==

VROM stands for virtual rom. In commercial releases, the majority of the game files are compressed so that the game is able to fit on the limited space of the 32 MiB rom. VROM addresses are thus used to represent the space that the file would be located if none of the files were compressed.

== RAM ==
RAM is an acronym for Random Access Memory. It's the space where variables are stored. RAM addresses typically begin with the 80 prefix.

N64 games can address either 4 or 8 MiB of ram (addresses <tt>80000000</tt> to <tt>803FFFFF</tt> or <tt>807FFFFF</tt>).

Ocarina of Time is designed to only address 4 MiB, but the Debug Rom and the canceled "Ura" expansion require 8 MiB of ram.

== VRAM ==
VRAM stands for virtual ram. It is the addressable space beyond the range of physical ram. The purpose of VRAM is that it allows the compiler to allocate more space than is available, so that the sub programs (stored in [[overlays|overlay files]]) for actors and similar are able to have their own addressable space without needing to take up physical ram space.

Overlays cannot be used without being loaded into RAM. When the overlay is in ram, any virtual addresses must be re-calculated to a ram address.

N64 games can address 8 MiB of virtual ram (addresses <tt>80800000</tt> to <tt>80FFFFFF</tt>).

== Bank Offsets ==

Bank offsets are a special set of addresses used to reference pure data files. Unlike addresses, bank offsets share the same addressable space across a set of files, rather than allocate a unique space for every file used in the game.

Bank offsets take the form <tt>bboooooo</tt>:
* '''b''' is an index to a set of pointers, each one pointing to the start of a single file loaded in memory
* '''o''' is an offset, relative to the start of the file referenced by the bank index.

The following is a list of known values for '''b''':
{|class="wikitable"
|00 || unknown
|-
|01 || unknown
|-
|02 || [[Scene]]
|-
|03 || [[Room]]
|-
|04 || [[gameplay_keep]]
|-
|05 || [[gameplay_field_keep]] (outside of dungeons), or [[gameplay_dangeon_keep]] (dungeons)
|-
|06 || current [[Object]]
|-
|07 || unknown/[[link_animetion]]
|-
|08+ || determined by current game circumstances
|-
|}

[[Category:Documentation]]

@@ Line 59: / Line 59: @@
 | 08+ || determined by current game circumstances || Not tracked by CPU
 |-
-| 0C || [[icon_item_dungeon_static]] ||
+| 0C || [[icon_item_field_static]]/[[icon_item_dungeon_static]] ||
 |-
 | 0D || [[map_name_static]] ||

@@ Line 60: / Line 60: @@
 |-
 | 0C || [[icon_item_dungeon_static]] ||
 |-
 | 14 || Z-Buffer || RSP Only

@@ Line 40: / Line 40: @@
 The segment address table is an array of 16 pointers, which define the start address for offset 0 of all 16 segment ids. Ocarina of Time typically assigns segment addresses in a consistent way:
-{|class="wikitable"
+{| class="wikitable"
-|00 || Direct Reference||
+| 00 || Direct Reference ||
 |-
-|01 || [[nintendo_rogo_static]]/[[title_static]]||
+| 01 || [[nintendo_rogo_static]]/[[title_static]] ||
 |-
-|02 || Current [[Scene]]||
+| 02 || Current [[Scene]]/[[parameter_static]] ||
 |-
-|03 || Current [[Room]]||
+| 03 || Current [[Room]] ||
 |-
-|04 || [[gameplay_keep]]||
+| 04 || [[gameplay_keep]] ||
 |-
-|05 || [[gameplay_field_keep]] (outside of dungeons), or [[gameplay_dangeon_keep]] (dungeons)||
+| 05 || [[gameplay_field_keep]] (outside of dungeons), or [[gameplay_dangeon_keep]] (dungeons) ||
 |-
-|06 || Current [[Object]]||
+| 06 || Current [[Object]] ||
 |-
-|07 || unknown/[[link_animetion]]||
+| 07 || unknown/[[link_animetion]] ||
 |-
-|08+ || determined by current game circumstances|| Not tracked by CPU
+| 08+ || determined by current game circumstances || Not tracked by CPU
 |-
-|14 || Z-Buffer || RSP Only
+| 0C || [[icon_item_dungeon_static]] ||
 |-
-|15 || Frame Buffer || RSP Only
+| 14 || Z-Buffer || RSP Only
 |}
 [[Category:Documentation]]

@@ Line 39: / Line 39: @@
 |00 || unknown
 |-
-|01 || [[title_static]]?
+|01 || [[nintendo_rogo_static]]/[[title_static]]
 |-
 |02 || [[Scene]]

@@ Line 7: / Line 7: @@
 N64 games typically take up either 16 or 32 MiB of ROM, and rarely 64 MiB of ROM. Dev flash carts (which are re-writable) are 256 MiB in size.
-Commercial releases of Ocarina of Time have a maximum capacity of 32 MiB, while the Debug Rom is 64 MiB.
+Commercial releases of Majora's Mask have a maximum capacity of 32 MiB, while the Debug Rom is 64 MiB.
 == VROM ==
@@ Line 18: / Line 18: @@
 N64 games can address either 4 or 8 MiB of ram (addresses <tt>80000000</tt> to <tt>803FFFFF</tt> or <tt>807FFFFF</tt>).
-Ocarina of Time is designed to only address 4 MiB, but the Debug Rom and the canceled "Ura" expansion require 8 MiB of ram.
+Majora's Mask is designed to address the full 8 MiB of ram.
 == VRAM ==