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Routines |
26471 | LD HL,(32759) | 32759 holds the lesson time counter |
26474 | DEC HL | Decrease it by 1 and set the zero flag if it's time to ring the bell |
26475 | LD A,H | |
26476 | OR L | |
26477 | LD (32759),HL | |
26480 | CALL Z,26342 | Change lesson if the lesson time counter reached zero |
26483 | CALL 25126 | Move the characters |
26486 | CALL 27353 | Move ERIC |
26489 | JR C,26556 | Jump if ERIC has already been dealt with |
26491 | LD HL,32744 | Decrement ERIC's main action timer at 32744 |
26494 | DEC (HL) | |
26495 | JR NZ,26556 | Jump unless it's time to deal with ERIC |
26497 | INC L | Pick up the midstride indicator at 32745 |
26498 | LD A,(HL) | |
26499 | AND A | Is ERIC midstride? |
26500 | JR Z,26507 | Jump if not |
26502 | CALL 25856 | Move ERIC from the midstride position, then scroll the screen left or right if necessary |
26505 | JR 26559 |
26507 | DEC L | Reset ERIC's main action timer at 32744 to 9 |
26508 | LD (HL),9 | |
26510 | CALL 62938 | Collect or simulate a keypress |
26513 | JR Z,26556 | Jump if no relevant keypress was collected or simulated |
26515 | LD HL,32763 | 32763 holds ERIC's status flags |
26518 | BIT 5,(HL) | Is ERIC writing on a blackboard? |
26520 | JR Z,26527 | Jump if not |
26522 | CALL 63146 | Deal with keypresses while ERIC is writing on the board |
26525 | JR 26556 | |
26527 | INC L | DE=32764 (used for storing the ASCII code of the last keypress) |
26528 | EX DE,HL | |
26529 | CP 32 | Was the keypress ASCII code >= 32? |
26531 | JR C,26556 | Jump if not |
26533 | LD HL,26556 | Push the address of the entry point at 26556 (see below) onto the stack |
26536 | PUSH HL | |
26537 | LD L,A | Point HL at the appropriate offset in the keypress table (26656-26751) |
26538 | LD H,104 | |
26540 | LD L,(HL) | Copy the ASCII code from the keypress table into 32764 |
26541 | LDI | |
26543 | LD E,(HL) | Pick up in DE the address of the appropriate routine for dealing with the keypress |
26544 | INC L | |
26545 | LD D,(HL) | |
26546 | PUSH DE | Push this address onto the stack |
26547 | LD HL,44128 | Point HL at byte 96 of ERIC's buffer |
26550 | LD B,(HL) | Pick up ERIC's animatory state in B and his coordinates in DE |
26551 | INC L | |
26552 | LD D,(HL) | |
26553 | INC L | |
26554 | LD E,(HL) | |
26555 | RET | Make an indirect jump to the appropriate routine for dealing with ERIC, then return to 26556 below |
26556 | CALL 27026 | Update the display |
26559 | LD HL,32762 | Wait until the system variable FRAMES at 23672 has been incremented since the last time it was checked (FRAMES is incremented every 20ms) |
26562 | LD A,(23672) | |
26565 | CP (HL) | |
26566 | JR Z,26562 | |
26568 | LD (HL),A | |
26569 | JP 26471 | Jump back to the beginning of the main loop |