[BUG REPORT] Append stört Serport

SYSTEM._StrIns:
                        MOV       _ACCFLO, _ACCFHI
                        ANDI      _ACCFLO, 3
                        TST       _ACCFLO
                        BREQ      SYSTEM._L0024
                        LSR       _ACCFLO
                        BRNE      SYSTEM._L0026
SYSTEM._L0026:
                        LPM       _ACCAHI, Z+
                        RJMP      SYSTEM._L0025
SYSTEM._L0024:
                        LD        _ACCAHI, Z+
SYSTEM._L0025:
                        TST       _ACCAHI
                        BREQ      SYSTEM._L0033
                        MOV       _ACCFLO, _ACCFHI
                        ANDI      _ACCFLO, 10h
                        BREQ      SYSTEM._L0028
SYSTEM._L0028:
                        LD        _ACCALO, X
SYSTEM._L0030:
                        CP        _ACCB, _ACCA
                        BRCC      SYSTEM._L0032
SYSTEM._L0033:
                        RET
SYSTEM._L0032:
                        MOV       _ACCDLO, _ACCB
                        SUB       _ACCDLO, _ACCA
                        MOV       _ACCDHI, _ACCDLO
                        SUB       _ACCDLO, _ACCAHI
                        BRCS      SYSTEM._L0038
                        CP        _ACCALO, _ACCA
                        BRCC      SYSTEM._L0035
                        MOV       _ACCELO, _ACCAHI
                        ADD       _ACCELO, _ACCALO
                        CP        _ACCB, _ACCELO
                        BRCS      SYSTEM._L0034
                        MOV       _ACCB, _ACCELO
SYSTEM._L0034:
                        RJMP      SYSTEM._L0038
SYSTEM._L0035:
                        PUSH      _ACCBLO
                        PUSH      _ACCBHI
                        PUSH      _ACCCLO
                        PUSH      _ACCCHI
                        MOV       _ACCDHI, _ACCALO
                        SUB       _ACCDHI, _ACCA
                        CP        _ACCDHI, _ACCDLO
                        BRCC      SYSTEM._L0036
                        MOV       _ACCDLO, _ACCDHI
SYSTEM._L0036:
                        CLR       _ACCDHI
                        ADD       _ACCBLO, _ACCA
                        ADC       _ACCBHI, _ACCDHI
                        ADD       _ACCBLO, _ACCDLO
                        ADC       _ACCBHI, _ACCDHI
                        ADIW      _ACCBLO, 1
                        MOVW      _ACCCLO, _ACCBLO
                        ADD       _ACCCLO, _ACCAHI
                        ADC       _ACCCHI, _ACCDHI
                        MOV       _ACCDHI, _ACCDLO
                        INC       _ACCDHI
                        MOV       _ACCFLO, _ACCFHI
                        ANDI      _ACCFLO, 10h
                        BREQ      SYSTEM._L0037
SYSTEM._L0037:
                        LD        _ACCGLO, -X
                        ST        -Z, _ACCGLO
                        DEC       _ACCDHI
                        BRNE     SYSTEM._L0037
SYSTEM._L0031:
                        POP       _ACCCHI
                        POP       _ACCCLO
                        POP       _ACCBHI
                        POP       _ACCBLO
                        MOV       _ACCB, _ACCA
                        ADD       _ACCB, _ACCAHI
                        ADD       _ACCB, _ACCDLO
                        BRNE     SYSTEM._L0042
SYSTEM._L0038:
                        ADD       _ACCAHI, _ACCDLO
                        INC       _ACCAHI
SYSTEM._L0042:
                        MOV       _ACCFLO, _ACCFHI
                        ANDI      _ACCFLO, 10h
                        BREQ      SYSTEM._L0045
SYSTEM._L0045:
                        ST        X, _ACCB
SYSTEM._L0044:
                        CLR       _ACCALO
                        ADD       _ACCBLO, _ACCA
                        ADC       _ACCBHI, _ACCALO
SYSTEM._L0043:
                        MOV       _ACCFLO, _ACCFHI
                        ANDI      _ACCFLO, 3
                        TST       _ACCFLO
                        BREQ      SYSTEM._L0046
                        LSR       _ACCFLO
                        BRNE      SYSTEM._L0048
SYSTEM._L0048:
                        LPM       _ACCGLO, Z+
                        RJMP      SYSTEM._L0047
SYSTEM._L0046:
                        LD        _ACCGLO, Z+
SYSTEM._L0047:
                        MOV       _ACCFLO, _ACCFHI
                        ANDI      _ACCFLO, 10h
                        BREQ      SYSTEM._L0049
SYSTEM._L0049:
                        ST        X+, _ACCGLO
SYSTEM._L0050:
                        DEC       _ACCAHI
                        BRNE     SYSTEM._L0043
SYSTEM._L0041:
                        RET

SYSTEM.DefIntErr:
                        RETI

program isrtable;

{$NOSHADOW}
{ $WG}                     {global Warnings off}

Device = mega32, VCC=5;
{ $BOOTRST $03800}         {Reset Jump to $03800}

Define_Fuses
//  Override_Fuses;
  NoteBook   = A;
  COMport    = USB;
  LockBits0 = [];
  FuseBits0  = [];
  FuseBits1  = [SPIEN, JTAGEN, OCDEN];

Import SysTick, SerPort;

From System Import ;


Define
  ProcClock      = 16000000;       {Hertz}
  SysTick        = 10;             {msec}
  StackSize      = $0064, iData;
  FrameSize      = $0064, iData;
  SerPort        = 19200, Stop2;    {Baud, StopBits|Parity}
  RxBuffer       = 8, iData;
  TxBuffer       = 8, iData;

Implementation

{$IDATA}

{--------------------------------------------------------------}
{ Type Declarations }

type


{--------------------------------------------------------------}
{ Const Declarations }

{--------------------------------------------------------------}
{ Var Declarations }
{$IDATA}


{--------------------------------------------------------------}
{ functions }



{--------------------------------------------------------------}
{ Main Program }
{$IDATA}

var txt : string[25];
var c : char;

begin
  c := '3';
  txt := '';
  append(c, txt);

  EnableInts;
  loop
    mdelay(1);

  endloop;
end isrtable.