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Routines |
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| 31636 | LD A,(65532) | Check Magic Knight's action flags... | ||
| 31639 | BIT 0,A | ...and if he can't command... | ||
| 31641 | JP Z,27189 | ...then jump into main game loop (process keyboard input and move Magic Knight, enter menus or execute other command) | ||
| 31644 | CALL 38075 | Play upward scale sound | ||
| 31647 | LD HL,44073 | Point HL at "COMMAND ?" text | ||
| 31650 | LD DE,46402 | Point DE at "COMMAND" text | ||
| 31653 | CALL 35141 | Display and process input for character selection menu (current room's characters only), setting Current Character | ||
| 31656 | LD DE,45820 | Point DE at "TO" text... | ||
| 31659 | CALL 38693 | ...and print in command summary window at bottom of screen | ||
| 31662 | LD A,23 | Display "WHICH COMMAND DO YOU WANT TO USE" (Command [CHARACTER] to...) menu window... | ||
| 31664 | CALL 36979 | ... | ||
| 31667 | LD HL,46405 | Print "WHICH COMMAND DO YOU WANT TO USE" + "A GO TO SLEEP ... B WAKE UP ..." etc. text... | ||
| 31670 | CALL 36725 | ... | ||
| 31673 | CALL 37333 | Process input for menu, and load ASCII code of shortcut for selected (i.e. SPACE or fire pressed) item into A | ||
| 31676 | SUB 65 | Subtract 65 (ASCII code for "A") to leave index of selected command | ||
| 31678 | LD (31696),A | Set index of "command a character" routine to jump to later | ||
| 31681 | LD B,A | Copy into B | ||
| 31682 | CALL 34859 | Advance HL to the B-th entry in list of option texts from "command a character" menu | ||
| 31685 | EX DE,HL | Swap DE (now points to selected command's "command a character" menu text) and HL (now undefined) | ||
| 31686 | CALL 38693 | ...and print in command summary window at bottom of screen | ||
| 31689 | LD A,(30615) | Load A with index of Current Character (see trivia) | ||
| 31692 | CALL 38725 | Display execute / reject command window and return if execute chosen, else exit | ||
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The operand of the instruction at 31695 represents the index of the "command a character" routine to jump to as stored previously. This is modified by the instruction at 31678.
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| 31695 | LD A,0 | Load A with index of "command a character" routine to jump to... | ||
| 31697 | ADD A,A | ...double it (as entries are two bytes wide)... | ||
| 31698 | LD E,A | ...and load it into DE... | ||
| 31699 | LD D,0 | ... | ||
| 31701 | LD HL,31710 | Point HL to start of "Magic Knight command a character to..." routines table | ||
| 31704 | ADD HL,DE | Add offset to obtain entry of interest | ||
| 31705 | LD A,(HL) | Load address at this location into HL... | ||
| 31706 | INC HL | ... | ||
| 31707 | LD H,(HL) | ... | ||
| 31708 | LD L,A | ... | ||
| 31709 | JP (HL) | ...and jump to it | ||
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