Splitting Images: Game Status Buffer

Address

Length

Description

2881

Holds the image for the current level.

2

Pointer: Current Level Data

20

Table: Level Data

18

1

1

Game status buffer entry at D828

1

Game status buffer entry at D829

1

Game status buffer entry at D82A

1

Game status buffer entry at D82B

2

Destination Cursor Position

2

Current Player Cursor Position

2

Storage Cursor Position

1

Game status buffer entry at D832

1

Game status buffer entry at D833

1

Player Cursor Tile ID

Each tile square is numbered, this value represents the tile the cursor is currently placed on. Note the numbering is not entirely sequential.

1

Player Cursor Flag

Used by the routines at D352, StartGame, Handler_Controls, Remove_PlayerCursor, Display_PlayerCursor and Handler_CheckTime.

Byte	Meaning
00	Off
01	On

1

Home Arrow Attribute Table Offset

Used by the routine at Handler_HomeArrow.

1

Game status buffer entry at D837

1

1

Game status buffer entry at D839

1

1

Game status buffer entry at D83B

1

Game status buffer entry at D83C

1

Game status buffer entry at D83D

1

Game status buffer entry at D83E

1

Game status buffer entry at D83F

1

Game status buffer entry at D840

1

Game status buffer entry at D841

1

Game status buffer entry at D842

1

Game status buffer entry at D843

1

Game status buffer entry at D844

1

Game status buffer entry at D845

1

Game status buffer entry at D846

1

Game status buffer entry at D847

1

Game status buffer entry at D848

1

Game status buffer entry at D849

2

Game status buffer entry at D84A

4

Game status buffer entry at D84C

3

Game status buffer entry at D850

8

Game status buffer entry at D853

4

Time Bar flags and variables.

12

Game status buffer entry at D85F

2

Game status buffer entry at D86B

1

Game status buffer entry at D86D

1

3

2

Screen Position: Life Icons

Used by ExtraLife and StartGame to hold the attribute buffer address of the where the lives icons are displayed.

Initialised to 5ADA at D1FC.

3

2

Screen Position Selected Menu Item

Used by Handler_MainMenu and HighlightSelectedMenuItem to hold the attribute buffer address of the currently selected menu item.

Initialised to 5843 at D1BF.

21

Defaults Of Some Kind?

Used by the routine at Game_Initialisation.

2

Game status buffer entry at D88E

2

Game status buffer entry at D890

2

Pointer Level Graphics Data

Will point to one of:

Address	Level
GraphicsData_Level_01	Level 01
GraphicsData_Level_02	Level 02
GraphicsData_Level_03	Level 03
GraphicsData_Level_04	Level 04
GraphicsData_Level_05	Level 05
GraphicsData_Level_06	Level 06
GraphicsData_Level_07	Level 07
GraphicsData_Level_08	Level 08
GraphicsData_Level_09	Level 09
GraphicsData_Level_10	Level 10

1

Game status buffer entry at DA15

1

Game status buffer entry at DA16

1

Game status buffer entry at DA17

1

Game status buffer entry at DA18

1

Game status buffer entry at DA19

1

Game status buffer entry at DA1A

1

Game status buffer entry at DA1B

1

Game status buffer entry at DA1C

2

Game status buffer entry at DA1D

29

Game status buffer entry at DA1F

4

Game status buffer entry at DD6F

80

Table: Tile Data Offsets

Used by the routine at Draw_Tile.

49

Used by the routine at Handler_IsLevelComplete.

2

Random Number Seed

1

2

Item Sprite Bank

Will point to either of: Buffer_Image, GraphicsData_Items_01 or GraphicsData_Items_02.

2

Game status buffer entry at E5B0

1

Data: Control Byte

Used by the routines at E2FD, Handler_PlayerInput and InputHandler_Common.

Byte	Meaning
00	No input
01	Right
02	Left
04	Down
08	Up
10	Fire

16

Saved Attributes Block For Cursor

Saves the attributes before painting the players cursor, this allows it to more easily be "undrawn".

Used by the routines at Draw_Cursor and Remove_PlayerCursorAttributes.

2

Cursor Attribute Position

2

Cursor Attribute Buffer Pointer

14

Home Arrow Attributes

Used by the routine at Handler_HomeArrow.

12

Home Attributes

Used by the routine at Home_DefaultAttributes.

12

Cursor Attributes

Used by the routine at Draw_Cursor.

11

Table: Cursor Attribute Positions

Used by the routine at PlayerCursor_AttributesRotator.

2

Temporary Cursor Attribute Byte Pointer

Used by the routine at PlayerCursor_AttributesRotator.

20

Tile Helper Variables

2

Input Control Pointer

Will point to one of:

Control Method	Address
Keyboard	InputHandler_Keyboard
Kempston	InputHandler_Kempston
Cursor	InputHandler_Cursor
Sinclair	InputHandler_Sinclair

1

Selected Menu Item

Populated by the routine at Handler_MainMenu (UpdateMenuSelection).

Byte	Meaning
01	Keyboard
02	Kempston
03	Cursor
04	Sinclair

1

Game status buffer entry at EB39

28

Game status buffer entry at EB3A

114

Game Over Variables