####Download Here!

Tricky68k is a Motorola 68000 simulator for Mac OS X, based on Volker
Barthelmann's VASM assembler, the GNU binutils package, Karl Stenerud's Musashi emulator, and Jonathan Mitchell's Fragaria editor.

Tricky68k currently runs on Mavericks and higher.

Since I am using the stock GNU binutils from GNU's anonymous git repository, when building Tricky68k it's necessary to deal with autotools.

Because make takes a great amount of time even when nothing is to be rebuilt, the app's Xcode target does not have binutils as a dependency. So, you have to build the binutils target at least once, before the app's build can succeed.

##Notes on the simulator The actual simulation of your code is run in a separate process. So, if your fans are spinning mad and m68ksim is the culprit, then:

• If Tricky68k.app is closed, it's a bug;
• If Tricky68k.app is open you never ran anything, it's still a bug;
• If Tricky68k.app is open and you are running a program, then it's correct behavior, just pause the running executable and m68ksim will stop eating your CPU.

###About the Teletype The simulator implements a single I/O device (the teletype), mapped from 0xFFE000 to 0xFFFFFF inclusive.

• You write a (16 bit) word to that range to output a character to the teletype
• You read from the same range to fetch character from the keyboard FIFO. If the keyboard FIFO is empty, -1 will be read. No interrupts are fired when the FIFO gets data, so you need a loop which waits until a character is read:

fetchChar:
  move.w $FFE000,d0
  bmi fetchChar         ;Loop while reads a < 0 value
  ;Read something > 0 => got a character