/*****************************************************************
/                                      SET BANK 8254/INDEXED-ARRAY
/
/ Call this function when changing from one bank to another.  Recommend only
/ changing the bank when one read/writes to the 8254, since that is likely to
/ be read/written to the least amount compared to the indexed register array.
/
/ Alternatively, one could check the RB bit each time an indexed register
/ is read or written; it will then take longer on average to read/write registers.
*/
void STX104_Set_Bank( int board, char bank )
{
    unsigned char scratch;
    unsigned char value;
    unsigned int address;

    address = stx104_base_address[board] + STX104_ADC_CONFIGURATION;
    scratch = inp( address );
    if ( bank == 0 ) /* request banking to the 8254 */
    { /* test for RB bit in ADC configuration register */
        if ( (scratch & 0x80) == 0x80 )
        {
            scratch = scratch & 0x0F;
            value = scratch | 0x30;
            outp( address, value );
            value = scratch | 0x30;
            outp( address, value );
            value = scratch | 0xB0;
            outp( address, value );
            value = scratch | 0xA0;
            outp( address, value );
        }
    }
    else
    {   /* request banking to the indexed register array */
        if ( (scratch & 0x80) == 0 )
        {
            scratch = scratch & 0x0F;
            value = scratch | 0xF0;
            outp( address, value );
            value = scratch | 0xF0;
            outp( address, value );
            value = scratch | 0x50;
            outp( address, value );
            value = scratch | 0xD0;
            outp( address, value );
        }
    }
}