https://github.com/shysaur/tricky68k

Motorola 68000 simulator for Mac OS X
https://github.com/shysaur/tricky68k

assembly macos motorola-68000 simulator

Last synced: about 1 month ago
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Motorola 68000 simulator for Mac OS X

• Host: GitHub
• URL: https://github.com/shysaur/tricky68k
• Owner: shysaur
• License: mit
• Created: 2015-01-18T20:32:13.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2021-08-13T22:10:05.000Z (over 3 years ago)
• Last Synced: 2023-02-27T19:55:44.340Z (almost 2 years ago)
• Topics: assembly, macos, motorola-68000, simulator
• Language: C
• Size: 6.08 MB
• Stars: 42
• Watchers: 12
• Forks: 4
• Open Issues: 4
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Tricky68k

### [Download Here!](https://github.com/shysaur/Tricky68k/releases)

Tricky68k is a Motorola 68000 simulator for macOS, based on Volker  

Barthelmann's [VASM](http://sun.hasenbraten.de/vasm/) assembler, the 

[GNU binutils](http://www.gnu.org/software/binutils/) package, Karl Stenerud's 

[Musashi](https://github.com/kstenerud/Musashi) emulator, and the

[Fragaria](https://github.com/shysaur/Fragaria) editor.

Tricky68k was tested on OS X Yosemite and later, up to macOS Catalina.

### 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

```