Routines 
Prev: 30630  Up: Map 
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.


30636  LD HL,32754  Check (and decrement) the linesgiving 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 ycoordinate  
30658  LD C,155  This is the ycoordinate 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 ycoordinate 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 ycoordinate of the bottom floor  
30672  LD A,C  A=ERIC's ycoordinate (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  
30704  LD A,B  B=ERIC's xcoordinate  
30705  CP (HL)  Compare it with the xcoordinate 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:


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 (02)  
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:


30776  LD D,A  D=0, 1, 2, 3 or 4  
30777  LD L,242  HL=32754: linesgiving delay counter (073)  
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 xcoordinate in E, and set his xcoordinate to 255 temporarily, so he's out of range and will not be regarded as a linesgiving 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 xcoordinate of the last teacher who gave ERIC lines  
30808  LD A,(32755)  Restore the xcoordinate of the teacher who was temporarily placed out of linesgiving 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 xcoordinate of the last teacher who gave ERIC lines  
30820  LD A,(32755)  Restore the xcoordinate of the teacher who was temporarily placed out of linesgiving 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 linesgiving 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 (47)  
30852  RRCA  A=character number of ERIC's teacher for this period  
30853  RRCA  
30854  RRCA  
30855  RRCA  
30856  ADD A,163  
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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