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Improves commentary.

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This commit is contained in:
Thomas Harte 2021-03-03 20:33:28 -05:00
parent cbf5a79ee8
commit 83d0cfc24e
1 changed files with 7 additions and 7 deletions
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14
Processors/65816/Implementation/65816Storage.hpp
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@ -277,14 +277,14 @@ struct ProcessorStorage {
// Flags aplenty.
MOS6502Esque::LazyFlags flags;
uint8_t mx_flags[2] = {1, 1}; // [0] = m; [1] = x. In both cases either `0` or `1`; `1` => 8-bit.
uint16_t m_masks[2] = {0xff00, 0x00ff}; // [0] = src mask; [1] = dst mask.
uint16_t x_mask = 0x00ff; // Just a mask representing the current size of the index registers.
uint16_t e_masks[2] = {0xff00, 0x00ff};
int m_shift = 0;
int x_shift = 0;
bool emulation_flag = true;
uint16_t m_masks[2] = {0xff00, 0x00ff}; // [0] = src mask (i.e. that which is unaffected by an operation); [1] = dst mask (i.e. 0xffff ^ src mask).
uint16_t x_mask = 0x00ff; // A mask representing the current size of the index registers. Equivalent to m_masks[1].
uint16_t e_masks[2] = {0xff00, 0x00ff}; // Akin to m_masks, but set as per emulation mode.
int m_shift = 0; // How far to shift memory/A to align its sign bit with that of the flags register. i.e. 8 for 16-bit mode, 0 for 8-bit mode.
int x_shift = 0; // m_shift equivalent for X and Y.
bool emulation_flag = true; // The emulation flag; true = in emulation mode.
// I.e. the offset for direct addressing (outside of emulation mode).
// The offset for direct addressing (i.e. outside of emulation mode).
uint16_t direct = 0;
// Banking registers are all stored with the relevant byte