Routines
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79D4: Check whether ERIC is where he should be
 Used by the routines at 7BA0, 7C6E, 7C97, 7CD0 and F300. Returns with the zero flag set if and only if ERIC is where he should be during dinner or class. 79D4 CALL \$79FD Get ERIC's coordinates in DE 79D7 LD A,D A=ERIC's y-coordinate 79D8 PUSH HL 79D9 LD HL,\$7790 Point HL at the skool region table for the top floor (see 77AC) 79DC CP \$9B Is ERIC on the top floor? 79DE JR Z,\$79EE Jump if so 79E0 CP \$A2 Set the zero flag if ERIC's on the middle floor 79E2 LD L,\$9C HL=779C (skool region data table for the middle floor; see 77AC) 79E4 JR Z,\$79EE Jump if ERIC's on the middle floor 79E6 LD L,\$A6 HL=77A6 (skool region data table for the bottom floor; see 77AC) 79E8 CP \$A9 Is ERIC on the bottom floor? 79EA JR Z,\$79EE Jump if so 79EC POP HL 79ED RET Return with the zero flag reset ERIC is on the top, middle or bottom floor (i.e. not on a staircase). 79EE LD A,E A=ERIC's x-coordinate 79EF CP (HL) Find the region identifier (0-7) for ERIC's current location 79F0 INC HL 79F1 INC HL 79F2 JR NC,\$79EF 79F4 DEC HL HL now points at the region identifier 79F5 LD A,(\$7FF4) Pick up the current lesson descriptor from 7FF4 79F8 AND \$07 Keep only the room bits (bits 0-2) 79FA CP (HL) Is ERIC where he should be? 79FB POP HL 79FC RET Return with the zero flag set if so
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