GB Programming: Difference between revisions
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>Bbbbbbbbba m (→A special jp: Change "jp (hl)" to "jp hl") |
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* A group of 32 bits is called a '''double word''' or '''dword'''. |
* A group of 32 bits is called a '''double word''' or '''dword'''. |
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* A group of 64 bits is called a '''quadruple word''' or '''qword'''. |
* A group of 64 bits is called a '''quadruple word''' or '''qword'''. |
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We will mostly be working with bytes, sometimes with words and rarely with nibbles. It is |
We will mostly be working with bytes, sometimes with words and rarely with nibbles. It is very rare to work with other structures, so you may forget them if you will. |
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Now, let's talk about '''hexadecimal'''. It is '''base 16''', so we will be working with 16 symbols : 0 1 2 3 4 5 6 7 8 9 A B C D E F. Again, we will prepend hex numbers with a $ to differentiate them. |
Now, let's talk about '''hexadecimal'''. It is '''base 16''', so we will be working with 16 symbols : 0 1 2 3 4 5 6 7 8 9 A B C D E F. Again, we will prepend hex numbers with a $ to differentiate them. |
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|Equivalent to ''ld a, (hl)'' then ''dec hl''. |
|Equivalent to ''ld a, (hl)'' then ''dec hl''. |
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These are often used to operate on |
These are often used to operate on chunks of memory. |
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===Overflow=== |
===Overflow=== |
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