Routines
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30636: Make any nearby teacher give ERIC lines if necessary
Used by the routine at 27353. Checks whether ERIC is somewhere he shouldn't be, or sitting or standing when or where he shouldn't be, or lying down, and makes any nearby teacher give lines accordingly.
Input
Output
30636 LD HL,32754 Check (and decrement) the lines-giving delay counter at 32754, and proceed only if it was <75 (the counter starts off at 0 for a new game, and is set to 150 by this routine after ERIC has been given lines)
30639 LD A,(HL)
30640 AND A
30641 JR Z,30647
30643 DEC (HL)
30644 CP 75
30646 RET NC
30647 LD BC,(44129) Collect ERIC's coordinates in BC
30651 LD L,251 HL=32763 (ERIC's status flags)
30653 BIT 2,(HL) Is ERIC jumping?
30655 JR Z,30672 Jump if not
30657 LD A,C A=ERIC's y-coordinate
30658 LD C,155 This is the y-coordinate of the top floor
30660 CP 156 Is ERIC on the top floor?
30662 JR C,30672 Jump if so
30664 LD C,162 This is the y-coordinate of the middle floor
30666 CP 163 Is ERIC on the middle floor?
30668 JR C,30672 Jump if so
30670 LD C,169 This is the y-coordinate of the bottom floor
30672 LD A,C A=ERIC's y-coordinate (adjusted if he's jumping)
30673 LD DE,30608 Point HL at the skool region data table for the top floor at 30608
30676 EX DE,HL
30677 CP 155 Is ERIC on the top floor?
30679 JR Z,30704 Jump if so
30681 LD L,156 HL=30620 (skool region data table for the middle floor)
30683 CP 162 Is ERIC on the middle floor?
30685 JR Z,30704 Jump if so
30687 LD L,166 HL=30630 (skool region data table for the bottom floor)
30689 CP 169 Is ERIC on the bottom floor?
30691 JR Z,30704 Jump if so
ERIC is on a staircase. Is he sitting on the stairs?
30693 EX DE,HL HL=32763 (ERIC's status flags)
30694 BIT 7,(HL) Reset the zero flag if ERIC is sitting
30696 LD A,7 This value is ignored
30698 JR Z,30712 Jump unless ERIC is sitting on the stairs
30700 LD A,0 Lines reprimand 0: DON'T SIT ON THE STAIRS
30702 JR 30776 Make any nearby teacher give lines
At this point, HL holds the base address of a data table describing the regions in the skool (30608 for the top floor, 30620 for the middle floor, or 30630 for the bottom floor).
30704 LD A,B B=ERIC's x-coordinate
30705 CP (HL) Compare it with the x-coordinate from the region table
30706 INC HL
30707 INC HL
30708 JR NC,30705 Jump back until we've determined where ERIC is
30710 DEC HL Point DE at the ID byte of the region table entry
30711 EX DE,HL
The ID bytes in the region tables have the following meanings:
ID Meaning
0 ERIC should never be here (head's study or staff room)
2 Map Room
3 White Room
4 Exam Room
5 Revision Library
6 Dinner hall
7 None of the above
30712 LD A,(DE) A=ID of the region ERIC's in (7 if he's on a staircase)
30713 AND A Set the zero flag if ERIC's in a forbidden zone
30714 LD A,1 Lines reprimand 1: THE ROOM IS PRIVATE
30716 JR Z,30776 Jump if ERIC's in the head's study or the staff room
30718 LD A,(DE) A=ID of the region ERIC's in
30719 LD L,200 HL=32712 (lesson status flags)
30721 BIT 7,(HL) Jump if EINSTEIN has not had a chance to grass on ERIC for being absent yet, or dinner has not started yet, or this is PLAYTIME or REVISION LIBRARY
30723 JR Z,30763
30725 LD A,(32756) 32756 holds the current lesson descriptor
30728 AND 7 Keep only the 'room' bits (0-2)
30730 EX DE,HL
30731 CP (HL) Compare this with ERIC's region ID
30732 EX DE,HL
30733 LD A,2 Lines reprimand 2: GET TO WHERE YOU SHOULD BE
30735 JR NZ,30776 Jump if ERIC is not where he should be
30737 LD A,(HL) Pick up the lesson status flags from 32712
30738 RLCA Set the carry flag if ERIC's lesson has started with ERIC present
30739 RLCA
30740 LD A,(44128) A=ERIC's animatory state
30743 JR NC,30754 Jump if ERIC's lesson has not started
30745 AND 15 ERIC's lesson has started; is ERIC sitting in a chair?
30747 CP 5
30749 RET Z Return if so
30750 LD A,3 Lines reprimand 3: NOW FIND A SEAT
30752 JR 30776 Make any nearby teacher give lines
ERIC's lesson has not started yet.
30754 AND 7 Is ERIC standing, or midstride, or sitting on a chair?
30756 CP 6
30758 RET C Return if so
30759 LD A,4 Lines reprimand 4: GET OFF THE FLOOR
30761 JR 30776 Make any nearby teacher give lines
Bit 7 of 32712 is reset, which means EINSTEIN has not yet had a chance to grass on ERIC for being absent at the start of the lesson, or dinner has not started yet, or this is PLAYTIME or REVISION LIBRARY.
30763 CP 5 Is ERIC in a room?
30765 JR NC,30740 Jump if not
30767 LD A,(32760) Pick up the MSB of the lesson clock in A
30770 CP 19 Should ERIC have left the room he was in last period?
30772 JR NC,30740 Jump if not
30774 JR 30725 Otherwise check ERIC's location
ERIC is not where he should be, or is not sitting down when he should be, or is sitting on the floor or on the stairs. In short, he should be given lines by any adult witness. At this point A holds one of the following values:
A Meaning
0 ERIC is sitting on the stairs
1 ERIC is in the head's study or the staff room
2 ERIC is not in the room he should be in
3 ERIC is not sitting down when he should be
4 ERIC is sitting on the floor
30776 LD D,A D=0, 1, 2, 3 or 4
30777 LD L,242 HL=32754: lines-giving delay counter (0-73)
30779 LD A,(HL) Is it too soon for the same teacher to give ERIC lines twice in a row?
30780 AND A
30781 JR Z,30790 Jump if not
30783 INC HL Otherwise, collect from 32755 into H the character number of the teacher who last gave ERIC lines
30784 LD H,(HL)
30785 LD L,98 Store this teacher's x-coordinate in E, and set his x-coordinate to 255 temporarily, so he's out of range and will not be regarded as a lines-giving candidate
30787 LD E,(HL)
30788 LD (HL),255
30790 PUSH DE
30791 PUSH AF
30792 LD D,C DE=ERIC's coordinates
30793 LD E,B
30794 LD HL,44128 Point HL at ERIC's character buffer
30797 CALL 28310 Get the floor closest to ERIC (155, 162 or 169) in D
30800 CALL 28223 Can ERIC be seen by a teacher?
30803 JR C,30816 Jump if so
30805 POP AF
30806 POP DE
30807 RET Z Return unless we need to restore the x-coordinate of the last teacher who gave ERIC lines
30808 LD A,(32755) Restore the x-coordinate of the teacher who was temporarily placed out of lines-giving range
30811 LD H,A
30812 LD L,98
30814 LD (HL),E
30815 RET
Time to dish out some lines to ERIC.
30816 POP AF
30817 POP DE
30818 JR Z,30827 Jump unless we need to restore the x-coordinate of the last teacher who gave ERIC lines
30820 LD A,(32755) Restore the x-coordinate of the teacher who was temporarily placed out of lines-giving range
30823 LD H,A
30824 LD L,98
30826 LD (HL),E
30827 LD B,D B=0, 1, 2, 3 or 4 (lines reprimand ID)
30828 EXX H=character number of the teacher who saw ERIC
30829 PUSH HL
30830 EXX
30831 POP HL
30832 LD L,150 Reset the lines-giving delay counter at 32754 to 150, and set 32755 to the character number of the teacher who saw ERIC
30834 LD (32754),HL
30837 LD L,98 DE=coordinates of the teacher who saw ERIC
30839 LD E,(HL)
30840 DEC L
30841 LD D,(HL)
30842 LD A,B B=0, 1, 2, 3 or 4 (lines reprimand ID)
30843 CP 2 Was ERIC spotted somewhere other than where he should be?
30845 JR NZ,30883 Jump if not
ERIC was spotted somewhere other than where he should be. The appropriate lines reprimand depends on who saw him: his teacher for this period, or another teacher.
30847 LD A,(32756) Pick up the current lesson descriptor from 32756
30850 AND 240 Keep only the teacher bits (4-7)
30852 RRCA A=character number of ERIC's teacher for this period
30853 RRCA
30854 RRCA
30855 RRCA
30858 CP H Was it ERIC's teacher who saw him?
30859 JR NZ,30883 Jump if not (with B=2: GET TO WHERE YOU SHOULD BE)
The truant ERIC has been spotted by his teacher for this period.
30861 LD B,5 Lines reprimand 5: COME ALONG WITH ME BOY
30863 LD A,(32712) Bits 4 and 5 of 32712 hold the flags that determine ERIC's teacher's next lines reprimand
30866 BIT 5,A Set the zero flag if ERIC's teacher hasn't said 'COME ALONG WITH ME BOY' yet
30868 SET 5,A Indicate that he has said this now
30870 JR Z,30880 Jump if ERIC's teacher has spotted him for the first time
30872 XOR 16 Flip bit 4
30874 INC B B=6: HURRY UP YOU HORROR
30875 BIT 4,A Should ERIC's teacher say this next?
30877 JR Z,30880 Jump if so
30879 INC B B=7: DON'T TRY MY PATIENCE BOY
30880 LD (32712),A Update the truancy lines reprimand flags in 32712
Now B holds the appropriate lines reprimand ID. Finally, give lines to ERIC.
30883 LD A,172 172=ERIC
30885 JP 30464 Give lines to ERIC
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