Skool Daze: Routine at $1468

$1468: Get the identifier and coordinates of the blackboard closest to a character

This corresponds to $7128 in the ZX Spectrum version.

Used by the routines at $0A58, $1129, $16E9, $184E, $19A5 and $1FA0. This routine also copies the blackboard's buffer into page 0.

Output
($DA)	Blackboard identifier
($15,$16)	Blackboard coordinates

$1468

JSR $1C8E

Check which floor the character is on.

$146B

CMP #$02

Is the character on the top floor?

$146D

BNE $147C

Branch if not.

$146F

LDA #$2A

Store the coordinates of the Reading Room blackboard at $15.

$1471

STA $15

$1473

LDA #$03

$1475

STA $16

$1477

LDY #$00

Y=0: Reading Room blackboard.

$1479

JMP $1499

Jump forward.

$147C

LDA $FC

Pick up the character's x-coordinate from $FC.

$147E

CMP #$25

Is the character to the right of the Exam Room wall?

$1480

BCS $148F

Branch if so.

$1482

LDA #$1A

Store the coordinates of the White Room blackboard at $15.

$1484

STA $15

$1486

LDA #$09

$1488

STA $16

$148A

LDY #$01

Y=1: White Room blackboard.

$148C

JMP $1499

Jump forward.

$148F

LDA #$29

Store the coordinates of the Exam Room blackboard at $15.

$1491

STA $15

$1493

LDA #$09

$1495

STA $16

$1497

LDY #$02

Y=2: Exam Room blackboard.

$1499

STY $DA

Store the blackboard identifier at $DA.

$149B

JSR $1421

Copy the blackboard's buffer into page 0.

$149E

RTS