| First you'll need a chart comparing hex and binary values:
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| Binary | Hexadecimal |
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| 0000 | 0 |
| 0001 | 1 |
| 0010 | 2 |
| 0011 | 3 |
| 0100 | 4 |
| 0101 | 5 |
| 0110 | 6 |
| 0111 | 7 |
| 1000 | 8 |
| 1001 | 9 |
| 1010 | A |
| 1011 | B |
| 1100 | C |
| 1101 | D |
| 1110 | E |
| 1111 | F |
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Ok, now, say you've got a hexadecimal number: B2C. Look at the chart and find the binary values for each of those hexadecimal values:
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Hexadecimal | B | 2 | C |
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Binary | 1011 | 0010 | 1100 |
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Then, just remove the spaces between the binary numbers, and voila!, you've got your binary equalvalent of the hexadecimal value you started with.
B2CH = 101100101100B
I gotta give mad props to dann's E2 Offline Scratchpad for helping to make those charts. | 
