|
Routines |
| Prev: 66E0 | Up: Map | Next: 6736 |
|
This routine is called from the main loop at 6767 when the lesson clock has counted down to zero. It sets each character up with the appropriate command list for the next lesson.
|
||||
| 66E6 | LD HL,$1500 | Reset the lesson clock at 7FF7 | ||
| 66E9 | LD ($7FF7),HL | |||
| 66EC | LD HL,$7FF9 | Advance the lesson number at 7FF9 by one and get the next lesson number (0x00-0x3F) in A | ||
| 66EF | INC (HL) | |||
| 66F0 | LD A,(HL) | |||
| 66F1 | CP $40 | |||
| 66F3 | JR NZ,$66F7 | |||
| 66F5 | XOR A | |||
| 66F6 | LD (HL),A | |||
| 66F7 | LD E,A | E=lesson number (0x00-0x3F) | ||
| 66F8 | CALL $F905 | Get the identifier for this lesson in A | ||
| 66FB | CP D | D=0xFE; ring the bell unless this is the second PLAYTIME in a row (only PLAYTIMEs 0xFE and 0xFF follow another PLAYTIME) | ||
| 66FC | PUSH AF | |||
| 66FD | CALL C,$6752 | |||
| 6700 | LD HL,$7FC8 | Clear the flags at 7FC8, 7FC9, 7FCA and 7FCB, the unused bytes at 7FCC, MR CREAK's birth year question indicator at 7FDA, and the unused byte at 7FDB | ||
| 6703 | LD B,$14 | |||
| 6705 | LD (HL),$00 | |||
| 6707 | INC L | |||
| 6708 | DJNZ $6705 | |||
| 670A | POP AF | |||
| 670B | LD E,A | E=lesson identifier (0xE0-0xFF) from the main timetable | ||
| 670C | LD D,$AC | Pick up the lesson descriptor (which determines who is teaching ERIC and in what room) and place it in 7FF4 | ||
| 670E | LD A,(DE) | |||
| 670F | LD ($7FF4),A | |||
| 6712 | PUSH DE | |||
| 6713 | CALL $F9A5 | Print the teacher and room names in the lesson box | ||
| 6716 | POP DE | |||
| 6717 | LD B,$14 | There are 20 non-player characters to prepare for the new lesson, starting with little boy no. 1 (0x98) | ||
| 6719 | LD H,$98 | |||
|
This entry point is used by the routine at 7C47 with B=1 to restart the command list for a single character.
|
||||
| 671B | EXX | |||
| 671C | LD H,$FE | The addresses of the command lists are in page 0xFE at FE80 | ||
| 671E | EXX | |||
| 671F | LD D,H | D=character number (0x98-0xAB) | ||
| 6720 | LD L,$7A | Set bit 0 of byte 0x7A of the character's buffer; this will trigger a restart of the command list (see 6226) | ||
| 6722 | SET 0,(HL) | |||
| 6724 | LD L,$77 | |||
| 6726 | LD A,(DE) | Pick up the command list number for this lesson from the character's personal timetable | ||
| 6727 | EXX | |||
| 6728 | LD L,A | A=LSB of the address of the command list | ||
| 6729 | LD A,(HL) | |||
| 672A | INC L | Point HL' at the MSB of the address of the command list | ||
| 672B | EXX | |||
| 672C | LD (HL),A | Copy the LSB to byte 0x77 of the character's buffer | ||
| 672D | INC L | L=0x78 | ||
| 672E | EXX | |||
| 672F | LD A,(HL) | A=MSB of the address of the command list | ||
| 6730 | EXX | |||
| 6731 | LD (HL),A | Copy the MSB to byte 0x78 of the character's buffer | ||
| 6732 | INC H | Next character | ||
| 6733 | DJNZ $671F | Jump back until all characters have been done | ||
| 6735 | RET | |||
| Prev: 66E0 | Up: Map | Next: 6736 |