Routines
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$35EF: Move ERIC from the midstride position
Called from the main loop at $0800.
$35EF JSR $322E Update the SRB for ERIC's current animatory state and location.
$35F2 LDA $26 Pick up ERIC's animatory state from $26.
$35F4 ASL A Is ERIC facing left?
$35F5 BCC $35FC Branch if so.
$35F7 INC $FC Increment ERIC's x-coordinate.
$35F9 JMP $35FE Jump forward.
$35FC DEC $FC Decrement ERIC's x-coordinate.
$35FE LDA $FB Adjust ERIC's y-coordinate (by the increment previously stored at $11) if he's going down a staircase.
$3600 CLC
$3601 ADC $11
$3603 STA $FB
$3605 LDA $FC Pick up ERIC's new x-coordinate from $FC.
$3607 AND #$01 Store 0 or 2 at $57, according as ERIC's new x-coordinate is even or odd.
$3609 ASL A
$360A STA $57
$360C LDA $26 Update ERIC's animatory state to the appropriate walking phase depending on his new x-coordinate.
$360E AND #$FC
$3610 CLC
$3611 ADC $57
$3613 STA $26
$3615 JSR $322E Update the SRB for ERIC's new animatory state and location.
$3618 JSR $33BF Restore ERIC's character buffer from page 0.
$361B JSR $31EA Update the display.
$361E LDA #$01 Set voice #3 attack length to 2ms and decay length to 24ms.
$3620 STA $D413
$3623 LDA #$81 Set voice #3 control register: voice on, attack-decay-sustain cycle; noise enabled.
$3625 STA $D412
$3628 LDA $FC Pick up ERIC's x-coordinate.
$362A SEC Subtract the x-coordinate of the leftmost column of the skool on screen.
$362B SBC $58
$362D CMP #$07 Is ERIC 7 character cells from the left of the screen?
$362F BNE $363B Branch if not.
$3631 LDA $58 Pick up the x-coordinate of the leftmost column of the skool on screen.
$3633 BEQ $364D Return if it's 0 (the play area window will not shift).
$3635 JSR $3072 Shift the play area window left.
$3638 JMP $364D Return.
$363B LDA $FC Pick up ERIC's x-coordinate.
$363D SEC Subtract the x-coordinate of the leftmost column of the skool on screen.
$363E SBC $58
$3640 CMP #$1F Is ERIC 31 character cells from the left of the screen?
$3642 BNE $364D Return if not (the play area window will not shift).
$3644 LDA $59 Pick up the x-coordinate of the leftmost column of the skool off screen.
$3646 CMP #$60 Is it 96?
$3648 BEQ $364D Branch if so (the play area window will not shift).
$364A JSR $3113 Shift the play area window right.
$364D RTS
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