A description of the later AI UK game engine encoding.

The basic design is superficially similar to the earlier games. Various
technologies like the token based compressor and the bitmap graphics are
reused, with the Seas Of Blood style graphics engine.

Flags

There are an unknown number of flags. They range in value from 0 to 255.
Overflows result in 255, underflows in 0. Several flags have special roles.
[256 flags ??]

Flag 0		Location		(Starts ?)
Flag 1		Set means dark		(Starts 0)
Flag 2		Carried Room		(Starts 253)
Flag 3		Worn Room		(Starts 254)
Flag 4					(Starts 4)    (max carried)
Flag 5		Carried Count		(Starts 0)
Flag 6		Num Objects			(Starts 150)  (num items ??)


Text

All text is stored tokenised. Each token is stored as ascii with the top
bit used to mark last character. Each string consists of a list of tokens
ending in token 5e or 7e. Capitalisation is automatic following ".". The
5E/7E may encode case or space information - I'm not sure yet. Various
things autocase - such as ".". Early games encode end of text tokens into
the compression stream - which makes them much slower to extract text.

Messages

Stored in the message table in Text format. The first messages are system
used as follows

0	. You can see		(object listing)
1-10	Directions
11	That input contained no recognized words
12	It is beyond my power to do that.
13	. You can go
14	what do you want to do now		(not early games)
15	you're carrying too much.
16	you are carrying the following:
17	nothing at all
18	game's now over. Do you want to play again (Y/N) ?
19	Ok.
20	press any key to continue
21	you already have it
22	sorry, I don't see it here.
23	you don't have it
24	you can't go that way
25	It is dark. You cannot see.
26	do you want to restore a saved game ?
27
28	you are not wearing it
29	you are wearing it
30	(worn),
31	No help at this stage.
32	I don't understand that verb
33+ game text


Locations 
0xFC	destroyed
0xFD	default carried	
0xFE	default worn

Exits

Exit data is in the form 

	<bit7 + room number>
		<verb><location> repeated until a code with the top bit is
		found. The top bit indicates we passed the end.
	<0xFF> marks the final end (??)

Verbs 1-10 are exits


Engine Tables

This is a sequence of conditions and actions. The encoding is as follows

	Bit 7		Action
	Bit 6		Set = Last Action (condition cannot be last)
	Bit 5-0		Code

Condition Codes
1	AT		L
2	NOTAT		L
3	ATGT		L
4	ATLT		L
5	PRESENT		O
6	HERE		O
7	ABSENT		O
8	NOTHERE		O
9	CARRIED		O
10	NOTCARRIED	O
11	WORN		O
12	NOTWORN		O
13	DESTROYED	O
14	NOTDESTROYED	O
15	ZERO		F
16	NOTZERO		F
17	WORD1		W
18	WORD2		W
19	WORD3		W
20	CHANCE		%
21	GT		F	N
22	LT		F	N
23	EQ		F	N
24	NE		F	N
25	OBJECTAT	O	L

Action Codes
1	LOAD	?
2	QUIT
3	INVENTORY
4	ANYKEY
5	SAVE
6	DROPALL
7	PICTURE ?
8	OK
9	GET		O
10	DROP		O
11	GOTO		L
12	GOBY		O	Something else in HEMAN ?
13	SET		F
14	CLEAR		F
15	MESSAGE		M
16	CREATE		O
17	DESTROY		O
18	PRINT		F
19	DELAY		T
20	WEAR		O
21	REMOVE		O
22	LET		F	N
23	ADD		F	N
24	SUB		F	N
25	PUT		O	L		(Unsure)
26	SWAP		O	O
27	SWAP		F	F
28	MEANS (?)	V	N
29	PUTWITH		O	O
30	BEEP		?	?		(Rebel Planet)
31	LOOK		?	?		(Unsure)
32	Unknown - appears in Heman 0 0
33	QSAVE		0	0		(He-man, Temple)
34	QLOAD		0	0		(He-Man, Temple)
35	Unknown
36	OOPS					(Temple)

Each sequence consists of sequences of conditions and then actions
each individual condition or action is followed by its parameters. A single 
0x7F marks the end of the tables

The automatics table has no verb/noun header. The actions table precedes
each table with two bytes. The first is the verb the second the noun.
A code of 0x7E indicates "any word" (is 0 none - unsure)

Verbs
0	NONE (noise AND/OR)
1=11	Exits (North, South, East, West, Up =, Down,
		NorthEast, NorthWest, SouthEast, SouthWest)
1C 	

Nouns
B8, DE, D1  ??

The word table is a single table. It contains 5 bytes per word being 4
letters (space padded) and a byte of value. The top bit is set for nouns
and clear for verbs. It ends XXXX[FF]

Functionality By Game

Games we can parse:
Rebel Planet
Blizzard Pass		-	unusual 128K mode
Temple of Terror	-	added opcodes
He Man			-	added opcodes, quicksave/restore
				interpreter "get all" helper

Games not yet parsed:
Kayleth			-	added opcodes, other changes


Section Locations (Blizzard Pass)

		75CE
Messages	7E26
Object Text	8CE6
Automatics	96D9
Commands	9A54
Words		A720
Room Exits	AB67
Tokens		B1BC
Object Starts	B6A8
Room ???	B798 (room graphics ?)
		FF terminated F8 marker ?
Room Text	1B000   (Segment 3)


Note that blizzard pass is special in that it is the only game for the 
Spectrum 128. The 128K version has two location tables (one for what would
be the graphical game and one for the text "other side of the tape" both
placed in one setup, with the rooms in the higher banks). Blizzard Pass
also appears to have a special hack so that there are two ranges of object
that append to the room description not one. This hack is not yet
implemented in TaylorMade.