Crediar: Map title is optional

2016-07-20T11:30:09Z

Map title is optional

← Older revision		Revision as of 11:30, 20 July 2016
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	! Command !! Size !! Description		! Command !! Size !! Description
	\|-		\|-
	\| FF \|\| 1 \|\| End of header, followed by map title, which is terminated by 0xD4 (see [[Message Format]])		\| FF \|\| 1 \|\| End of header, can be followed by map title, which then is terminated by 0xD4 (see [[Message Format]])
	\|-		\|-
	\| FE \|\| 5 \|\| Declare Object with Script		\| FE \|\| 5 \|\| Declare Object with Script

Nethraz: Introduction + Table of commands

2016-02-22T18:28:14Z

Introduction + Table of commands

New page

The '''Map Object Header''' declares the objects (and sprites) that are initially present on a map.
It also contains the [[Map Flags]] as first two bytes.

The address of the header can be found either at [28000 + 2*map_id] or at [38000 + 2*map_id], only one of these is allowed to be not null. The header is stored in the same 0x8000 bank as the pointer, either 0x82 or 0x83.

After the 2 byte [[Map Flags]], the header consists of a sequence of commands, which is terminated by 0xFF and the map's title.

== Commands ==

If a command declares an [[Objects|Object]], it gets assigned a handle in sequential order (starting from 0x1000) and is appended to the end of the object list.

The first object usually is the Ark Sprite, created by command '''FD''' and has the handle 0x1000.

{| class="wikitable"
|-
! Command !! Size !! Description
|-
| FF || 1 || End of header, followed by map title, which is terminated by 0xD4 (see [[Message Format]])
|-
| FE || 5 || Declare Object with Script
|-
| FD || 7 || Declare Object with Position and Script
|-
| FC || ?? || ??
|-
| FB || 5 || ??
|-
| FA || 3+2*x || Conditional Jump
|-
| F0 || 7 || ??
|-
| other || 10 or 16 || Declare Sprite with Flags3, Position, Script and optional Death Handler.

If '''(Extension Flags & 0xC0) == 0xC0''', then the command length is 16 and the death handler is specified,
else the length is 10.

{| class="wikitable"
|-
! Offset || 0 || 1 || 2 || 3 || 4 || 7 || 10 || 13
|-
! Value
| Flags3 = <br />(value & 0xC1) << 8 || X Position || Y Position || Extension Flag || Script || ?? || Death Handler || ??
|}

Map Object Header - Revision history

Crediar: Map title is optional

Nethraz: Introduction + Table of commands