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A puzzle involving a ZX81 programme.

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Reddevil1976 | 19:27 Sat 31st Mar 2012 | Quizzes & Puzzles
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I have been given a puzzle to solve and basically it is part of an old ZX81 thermal print sample and it has the following programme fragment on it:

0431 0303 LD D, E
0432 0304 LD D, 73
0433 0306 JR NZ, 20
0434 0308 SUB E
0435 0309 LD H, (HL)

The only hint I have been given to solve it is disassemble to discover.

The solution to the puzzle should come in the form of a set of decimal numbers.

Please can you help me solve this puzzle and please could you tell me how you solved it.

Many thanks in advance.
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