void sub_813A280(u8 taskId)
{
    s16 *data = gTasks[taskId].data;
    s16 var;

    if (gMain.newAndRepeatedKeys & DPAD_UP)
    {
        if(data[0])
        {
            PlaySE(5);
            data[0] = MoveMenuCursor(-1);
            var = data[1] + data[0];
            if (!data[9])
            {
                if (var == data[2])
                {
                    sub_813AD58(0xFFFF);
                }
                else
                {
                    sub_813AD58(gSaveBlock1.pcItems[var].itemId);
                }
            }
        }
        else // _0813A2E4
        {
            if (!data[1])
                return;
            PlaySE(5);
            data[1]--;
            sub_813AE0C(taskId);
            // probably further down
            if (data[9])
                MoveMenuCursor(0);
        }
    }
    else if(gMain.newAndRepeatedKeys & DPAD_DOWN) // _0813A306
    {
        if(data[0] != data[4] - 1)
        {
            PlaySE(5);
            data[0] = MoveMenuCursor(1);
            var = data[1] + data[0];

            if(data[9])
                return;

            if (var == data[2])
                sub_813AD58(0xFFFF); // probably further down
            else
                sub_813AD58(gSaveBlock1.pcItems[var].itemId);
        }
        else if(data[1] + data[0] != data[2])
        {
            PlaySE(5);
            data[1]++;
            sub_813AE0C(taskId);

            if (data[9])
                MoveMenuCursor(0);
        }
    }
    else if(gMain.newKeys & SELECT_BUTTON) // _0813A3A0
    {
        if (!data[9])
        {
            if (data[0] + data[1] != data[2])
            {
                PlaySE(5);
                data[9] = 1;
                data[8] = data[1] + data[0];
                sub_813AD58(0xFFF7);
            }
            // _0813A3DC
            sub_813ABE8(taskId);
        }
        else // _0813A3E8
        {
            PlaySE(5); // merging?
            sub_813AA30(taskId, 0);
            sub_813AE0C(taskId);
        }
    }
    else if(gMain.newKeys & A_BUTTON)
    {
        PlaySE(5);
        if(!data[9])
        {
            if(data[1] + data[0] != data[2])
            {
                sub_813A4B4(taskId);
            }
            else
            {
                sub_813A468(taskId);
            }
        }
        else
        {
            sub_813AA30(taskId, 0);
            sub_813AE0C(taskId);
        }
    }
    else if(gMain.newKeys & B_BUTTON)
    {
        PlaySE(5);
        if(!data[9])
        {
            sub_8072DEC();
            sub_813A468(taskId);
        }
        else
        {
            sub_813AA30(taskId, 1);
            sub_813AE0C(taskId);
        }
    }
}