diff options
| author | Astrid Smith | 2011-10-20 22:31:03 -0700 |
|---|---|---|
| committer | Astrid Smith | 2011-10-20 22:31:03 -0700 |
| commit | b295d8c83e39a0397465bd06596d223c97a93704 (patch) | |
| tree | 9319e60815e46b04f52b1be2e10e2607edb693c2 | |
| parent | c2b16e5e27c250b7eab9de0a65ec4da585bff06a (diff) | |
Documentation
| -rw-r--r-- | README.markdown | 13 | ||||
| -rw-r--r-- | main.asm | 32 | ||||
| -rw-r--r-- | opcodes.asm.m4 | 6 |
3 files changed, 31 insertions, 20 deletions
diff --git a/README.markdown b/README.markdown index 7f1c6b5..9e120d2 100644 --- a/README.markdown +++ b/README.markdown @@ -1,8 +1,13 @@ z680k: z80 emulator for 68k calculators ======================================= - -Astrid Smith -Project started: 2010-06-06 + 666 888 000 k k +zzzz 6 8 8 0 0 k k + z 6666 888 0 0 0 kk + z 6 6 8 8 0 0 k k +zzzz 666 888 000 k k + +Astrid Smith +Project started: 2010-06-06 GPL The intent of this project is to provide a fast and correct TI-83+ @@ -73,4 +78,4 @@ Incompatibilities with Real Hardware may not work. This is apparently a rare enough occurence that ignoring it is reasonable. -2. +2. @@ -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 diff --git a/opcodes.asm.m4 b/opcodes.asm.m4 index 99ead9d..03fd7cd 100644 --- a/opcodes.asm.m4 +++ b/opcodes.asm.m4 @@ -222,6 +222,12 @@ TIME MACRO emu_plain_op: ; Size(bytes) Time(cycles) ; S0 T0 + + ;; I would like to thank the State of Washington for + ;; supporting the initial development of this file, by giving + ;; me a job doing nothing with no oversight for hours at a + ;; time. + ;; NOP OPCODE(00,«»,4) |