1. PortA Doesn't Work http://www.picbasic.co.uk/forum/showthread.php?t=561
2. Look in your datasheet for ANSEL and ANSELH registers.
3. All Digital http://www.picbasic.co.uk/forum/showthread.php?t=11100

'CMCON = 7 'THIS DOES NOT WORK WITH THE PIC 16F690
Sure, this PIC don't have CMCON register, check the datasheet under Voltage Comparator section.