| 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | A | B | C | D | E | F | |
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| 9 | |
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| A | |
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| B | |
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| C | |
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| D | |
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| E | |
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| F | |
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| Always safe to use | |
| Used by BASIC only | |
| Used by tape routines only | |
| Not safe to use | |
| Unverified |