diff options
Diffstat (limited to 'main.asm')
| -rw-r--r-- | main.asm | 32 |
1 files changed, 16 insertions, 16 deletions
@@ -10,29 +10,29 @@ ;;; Registers used: ;;; -;;; A7 = sp -;;; A6 = emulated PC XXX -;;; A5 = instruction table base pointer -;;; A4 = emulated SP XXX -;;; A3 = pointer to flag_storage -;;; A2 = -;;; A1 = -;;; A0 = +;;; A7 68000 stack pointer +;;; A6/epc emulated PC +;;; A5 instruction table base pointer +;;; A4 emulated SP +;;; A3 pointer to flag_storage +;;; A2 +;;; A1 +;;; A0 ;;; -;;; D0 = current instruction, scratch for macros -;;; D1 = scratch for instructions -;;; D2 = further scratch +;;; D0 current instruction, scratch for macros +;;; D1 scratch for instructions +;;; D2 further scratch ;;; ;;; ;;; The following have their shadows in the top half of the register -;;; D3 = AF A is in the low byte, F in the high byte (yeah ... speed) -;;; D4 = BC B high, C low -;;; D5 = DE D high, E low -;;; D6 = HL H high, L low +;;; D3/eaf = AF A is in the low byte, F in the high byte (yeah ... speed) +;;; D4/ebc = BC B high, C low +;;; D5/ede = DE D high, E low +;;; D6/ehl = HL H high, L low ;;; ;;; IY is used more often so it's easier to get at. It can be slow ;;; but I don't really care to go to the effort to make it so. -;;; D7 = IX (hi), IY (low) +;;; D7/eixy = IX (hi word), IY (low word) ;;; emulated I and R are both in RAM |