How do I write letter-initiated hexadecimal numbers in masm code?

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The correct format for hex AB is 0ABh.

The reason you need to start it with a digit is so the assembler can easily distinguish it from a label or symbol such as ABh.

And don’t worry about the fact it has three digits. It doesn’t magically turn into a twelve-bit number because of that, the number of bits used will depend on the addressing modes you’re using.

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