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mainly the jump vectors to the lib functions. We need the exec lib structure in our virtual memory filled with the essential parts, i.e.
Amiga 500 emulator mac os x code#
Then point the virtual CPU to the first instruction of the first code segment and let the CPU run and boom! To see how far we got I early added extensive memory debugging to have a close look what is fetched from memory… I got as far as the first read to exec base at location 4… so we need some environment to run our binary in vamos! Setting up the Environment Now I was ready for a first experiment: I used my Python HunkReader from my amitools library to load a Amiga LoadSeg()able binary and relocate it into my still empty memory location. The native Python interface now allows to create the memory, read/write data to the block and control the CPU: read/write its registers and let it run… 1 MiB) and accessed by the virtual CPU (200 MHz CPU □ ). Now a single memory “RAM block” is allocated (e.g. In a first attempt I routed all memory accesss from Musashi to Python and managed memory there, but that was too slow (a 0.2 MHz CPU □ ) and so I moved to a C-based memory implementation. Now the only thing required to run this virtual CPU is memory. With the help of Python’s ctype module binding the native code was very easy. So the first thing was to attach the native m68k CPU emulator to Python.
![amiga 500 emulator mac os x amiga 500 emulator mac os x](https://www.bastianoso.de/wp-content/uploads/sites/10/2015/07/paradroid-90-768x480.png)
If everything works out and some portions are slow due to Python scripting I can gradually move them to C later on… I wanted to write (the first prototype of) vamos in Python 2.x as it allows to me to quickly get started and let’s me play around with different approaches fairly fast. I searched the web and found the Musashi CPU emulator. The thing in vamos that’s more difficult than in Wine is the machine architecture that differs: the Amiga binary is written in m68k code and my Mac runs an Intel x86 based CPU… So the first thing vamos will need is a m68k CPU emulation. I will start with all trapped Exec/Dos libs with empty functions and then step-by-step fill in the functions called by my first target tool: the SAS C compiler… I want to focus on Exec and Dos library as those provide the functions required for typical command line tools including compilers. an Open() call to Amiga’s dos.library will directly open a file on my Mac.
![amiga 500 emulator mac os x amiga 500 emulator mac os x](http://www.bastianoso.de/wp-content/uploads/sites/10/2015/07/commodore-amiga-workbench-1.3.png)
Amiga 500 emulator mac os x mac os x#
If you know Wine then the goal is fairly clear: write a native Mac OS X program that “executes” the Amiga binary, trap all native library calls (to Exec or DOS libary) and replace them with native versions, i.e.
Amiga 500 emulator mac os x series#
Read on to learn more about the birth of vamos and its first major milestone: run the SAS C compiler in my new “Developer’s Diary” series □ That was the beginning of my newes project: vamos – The Virtual AMiga OS emulator. While switching between TextMate on my Mac I used for editing the code and the CLI window in P-UAE I had a thought: “It would be fairly cool to have something like Wine for AmigaOS… Then I’d simply run the SAS C compiler Amiga binary on my Mac directly…” Everything was set up in a P-UAE-based AmigaOS 3.9 environment and worked fairly confortable.
![amiga 500 emulator mac os x amiga 500 emulator mac os x](https://www.vintageisthenewold.com/wp-content/uploads/2015/12/AmigaEmulator-520x245.png)
I did some classic m68k Amiga code development that uses the SAS C compiler recently (see plip2slip).