|
Game status buffer |
| Prev: A67F | Up: Map | Next: A76F |
|
All zero on the tape. When the game is first run, START clears everything from here to the end of the object records; after every game it clears again from BUCKET_OUT on. So the first five bytes -- the control method, the menu's two, an unused one and the random number -- carry over from one game to the next: the next game carries on the random sequence rather than replaying the last one, and the menu shows the method chosen before.
|
||||
| CONTROL | A709 | DEFB $00 | Control method: bits 1-2 are 0 keyboard, 1 Kempston, 2 cursor, 3 Interface II (MENU); bit 3 steers a joystick by direction (HANDLE_LEFT_RIGHT), and no menu choice sets it. Kept from game to game | |
| MENU_PASSES | A70A | DEFB $00 | Counted up each time round the menu's loop (MENU); nothing reads it | |
| A70B | DEFB $00 | Nothing refers to this byte | ||
| CONTROL_BEFORE | A70C | DEFB $00 | The control method as it was before the menu read the keys this time round; the menu compares the two and throws the result away | |
| RANDOM | A70D | DEFB $00 | The random number: R is added in at every new game and after every object's update (OBJECT_DONE). Read for the start room (CHOOSE_START), the drops from the sky (SKY_DROP), the collectables' starting spots (NEW_QUEST) and by SPIDER; PUFF_SOUND reads it as a word with the byte after, masked to an address in the ROM, and plays the bytes there as pitches | |
| BUCKET_OUT | A70E | DEFB $00 | 1 while the well's bucket is out: the well gives no other (WELL); the bucket clears it when it reaches a quest item (BUCKET). The first byte a new game clears | |
| PENTAGRAM_ON | A70F | DEFB $00 | 1 once all four quest items are done (ALL_FOUR_DONE): from then on the pentagram's pieces are put into their room (QUEST_INTO_ROOM) | |
| WIPE_COUNT | A710 | DEFB $00 | How many areas RENDER_DYNAMIC_OBJECTS has wiped this turn and left on the stack to be copied to the screen | |
| NEW_ROOM | A711 | DEFB $00 | Set by ENTER_ROOM when it has built a room. While it is set RENDER_DYNAMIC_OBJECTS wipes nothing; the main loop (OBJECT_DONE) then redraws the whole screen and the panel and clears it | |
| LIST_POINTER | A712 | DEFB $00,$00 | Where RENDER_DYNAMIC_OBJECTS is in the list at DRAW_LIST | |
| DRAW_WORK | A714 | DEFB $00 | The turn's drawing work: SORT_AND_DRAW zeroes it and counts every object it draws, RENDER_DYNAMIC_OBJECTS adds every area it wiped, and the main loop (OBJECT_DONE) waits six units less this | |
| TURNS | A715 | DEFB $00,$00 | The turn counter, counted up at the end of every turn (OBJECT_DONE); also read by CONVEYOR_PUSH and SPIDER | |
| SAVED_SP | A717 | DEFB $00,$00 | The stack pointer, while DRAW_OBJECT has it reading a sprite | |
| SORT_FIRST | A719 | DEFB $00,$00 | Where SORT_AND_DRAW is in the list at DRAW_LIST: the place after the object it has in hand | |
| SORT_SECOND | A71B | DEFB $00,$00 | The place after the object SORT_AND_DRAW is comparing it with | |
| ROOM_EXTENT | A71D | DEFB $00,$00,$00 | The room's size, from ROOM_SIZES (BUILD_ROOM): how far from the middle of the room, 128, an object may reach in U, then in V -- the walls' tests (ADJ_DU_FOR_OUT_OF_BOUNDS, ADJ_DV_FOR_OUT_OF_BOUNDS, CHK_PLYR_OOB) compare the distance plus its half-size with them -- and the floor's height in Z, 128 in all three sizes, below which nothing falls (ADJ_DZ_FOR_OUT_OF_BOUNDS) and on which the builder stands the objects | |
| PANEL_DUE | A720 | DEFB $00 | Set when what he carries changes (TAKE_OR_LEAVE); SHOW_CARRIED redraws the panel's items and clears it | |
| LIVES | A721 | DEFB $00 | Lives, in BCD. START gives five and every start of a life takes one (RESTART_PLAYER), so five is the one in play and four more; the game ends when there is none to take | |
| CARRIED | A722 | DEFB $00,$00,$00,$00 | What he carries: entries of four bytes, the graphic, the flags and the address of the thing's quest record. This one is a slot for the thing being picked up, empty between presses: TAKE_OR_LEAVE writes it here, then moves every entry along one | |
| CARRIED_SHOWN | A726 | DEFB $00,$00,$00,$00 | The things he carries, newest first; these two and the next are the three SHOW_CARRIED shows on the panel | |
| A72A | DEFB $00,$00,$00,$00 | |||
| CARRIED_LAST | A72E | DEFB $00,$00,$00,$00 | The oldest, which the next press puts down | |
| FONT_BASE | A732 | DEFB $00,$00 | The base the print routine (PRINT_CHAR) adds eight times a character's code to: 384 bytes below the font for text, the font itself for digits | |
| FRAME_DRAWN | A734 | DEFB $00 | 0 until DISPLAY_MENU has drawn the text screen's frame and copied the whole buffer to the screen, which it then does not do again; the menu and the win clear it to have that done afresh (MENU, WON) | |
| MENU_SPARE | A735 | DEFB $00 | Nothing reads or writes it: its only mention is an LD HL the menu's next instruction overwrites (MENU) | |
| PRINT_ATTR | A736 | DEFB $00 | The attribute PRINT_TEXT_SINGLE_COLOUR gives each cell of text it prints; set by PRINT_SCORE and DISPLAY_MENU | |
| INPUT | A737 | DEFB $00 | This turn's controls (READ_CONTROLS): bits 0 and 1 turn, 2 walk, 3 jump, 4 pick up or put down, 6 fire | |
| ROOM_ATTR | A738 | DEFB $00 | The room's attribute, its ink with BRIGHT on black (BUILD_ROOM); the main loop fills the screen's attributes with it on the first turn in a room (OBJECT_DONE) | |
| Z_STEP | A739 | DEFB $00 | The player's step in Z this turn, kept past the move (MOVE_PLAYER) | |
| TEMPLATES_AT | A73A | DEFB $00,$00 | The object template table the builder reads (OBJECT_TABLE, BUILD_ROOM) | |
| PLACE_NUDGE | A73C | DEFB $00 | Added to the objects' positions by the builder (BUILD_ROOM); zero for every room | |
| DROP_TIMER | A73D | DEFB $00 | Turns until something may fall from the sky (SKY_DROP); set on entering a room (RESET_DROP_TIMER) | |
| MAIN_SP | A73E | DEFB $00,$00 | The stack pointer, saved every turn by the main loop (OBJECT_DONE); nothing reads it back | |
| TAKE_HELD | A740 | DEFB $00 | 1 while the pick-up key is held, so one press does one thing (TAKE_OR_LEAVE) | |
| NO_HEADROOM | A741 | DEFB $00 | 1 when there is no room above him to stand on what he puts down (TAKE_OR_LEAVE) | |
| DROP_BAN | A742 | DEFB $00 | 1 in a room with the well, a quest item or a piece of the pentagram: nothing falls there (BAN_DROPS) | |
| FIRE_HELD | A743 | DEFB $00 | 1 while fire is held, so one press is one shot (FIRE) | |
| SCORE | A744 | DEFB $00,$00,$00 | The score, six BCD digits, the highest first (ADD_SCORE) | |
| TUNE_HEARD | A747 | DEFB $00 | Set once the menu's tune has played (PLAY_TUNE_ONCE) | |
| STEP_SOUND | A748 | DEFB $00 | Counted up by FOOTSTEP, which clicks on every fourth count | |
| SOUND_COUNT | A749 | DEFB $00,$00 | A sound effect under way: turns left, then which sound (EFFECT_NOTE). The pause's click (PAUSE_BEEP) counts the first byte up as well | |
| PLACED | A74B | DEFB $00 | How many collectables have reached their places in room 82 (COLLECTABLE) | |
| QUEST_DONE | A74C | DEFB $00 | How many quest items the bucket has reached (QUEST_ITEM) | |
| PERCENT | A74D | DEFB $00,$00 | The percentage of the quest done, BCD, the hundreds first, worked out by PERCENTAGE | |
| ROOMS_SEEN | A74F | DEFB $00,$00,$00,$00,$00,$00,$00,$00 | A bit for each room number, bit 7 of the first byte for room 0, set on entering it (MARK_ROOM_SEEN). PERCENTAGE counts all 31 bytes for the percentage, though rooms go no higher than 149, so only the first 19 can hold a bit | |
| A757 | DEFB $00,$00,$00,$00,$00,$00,$00,$00 | |||
| A75F | DEFB $00,$00,$00,$00,$00,$00,$00,$00 | |||
| A767 | DEFB $00,$00,$00,$00,$00,$00,$00 | |||
| A76E | DEFB $00 | Nothing refers to this byte | ||
| Prev: A67F | Up: Map | Next: A76F |