Old System Emulator Code Currently Wont

Theres a fairly playable emulation of the original Apple version here crazygames.com. One of the best actionpuzzle games of its time in my view.

Advanced Mac Substitute is an effort by long-time Mac hacker Josh Juran to make it possible to run old Mac OS software (up to Mac OS 6) without a need for an Apple ROM or system software.

Other emulators out there for 64000 Mac applications such as Basilisk II require a copy of MacOS installation media -- such as install CDs from Mac OS 7.5 or Mac OS 8.

But AMS uses a set of software libraries that allow old Mac applications to launch right within the operating environment of the host device, without needing to have a full virtual hardware and operating system instance behind them.

He showed me an early attempt at getting the game LoadRunner to work with the emulator -- its not yet interactive.

A version of the project, downloadable from Github, includes a Welcome screen application (a sort of Mac OS hello world), Mac Tic-Tac-Toe, and an animation of NyanCat.

Old System Emulator Code Currently Wont

While AMS works on Mac OS X up to version 10.12 -- both on Intel and PowerPC versions of the operating system -- the code currently wont compile on MacOS Mojave.

And the Linux implementation of AMS does not yet support keyboard input.

I was unable to get the front end to execute at all on Debian 9 on Intel.

Except that MacOS is a GUI OS and hence a lot more effort than DOSBOX.

DOSBOX is a combination 32 bit x86 processor, MS-DOS and BIOS emulation all combined.

Wine doesnt actually include a CPU emulator winehq.org.) This does, to allow M68k code to run on other chips.

This works because MacOS applications do not access the hardware directly but instead use system calls and let the operating system make the changes to hardware registers.

DOS Applications on the other hand usually use System calls mainly for disk access but will mostly directly manipulate the video and sound card hardware and also often do things like rea.

The project does have to include WINE-style implementations of OS behavior; but much more like DOSbox the relative lack of clean abstraction between the OS and and the lower level platform bits means a need to emulate that aspect as well.

There may be bits of WINE that have to lie about a BIOS(I suspect some win32 software freaks out if WMI inquiries related to win32computersystembios and friends dont produce coherent answers); but the OS and the platform details were much less entangled at that point.

IIRC The older MacOSes didnt do a whole lot as far as APIs went.

There were some menu management routines, printer drivers, networking and some hooks for desktop accessories, but most of the heavy lifting was done by the toolbox.

This left more memory for applications and bitmaps, as the old macs were pretty RAM constrained.

Once the Mac Plus came out and you could have 4MB of RAM, you saw the MultiFinder introduced, and some rudimentary APIs showing up as well.

Until the Mac x, they didnt have a PMMU, so normal VM paging didnt work (the Mac got an upgrade for it eventually.) Pages of the applications code was stored in segments, and each segment was loaded and unloaded, similar to.OVL files in MS-DOS.

The QuickDraw routines and the Toolbox did pretty much everything Of course, with System 6 came INITs and control panel devices, the closest equivalent these days would be.kext files or Linux kern.

The controls allowed you to change the direction of rotation and grab onto the point that your free end was about to swing past.

If anyone else remembers it and can tell me what it was called, I would be grateful.

Though I have to admit, I cant remember it having a real relation to the game itself.

Youd make your character dig holes in front of him, so as to either thwart the bad guys, or to jump in the hole and escape them.

Theres a fairly playable emulation of the original Apple version here crazygames.com.

One of the best actionpuzzle games of its time in my view.

Old Mac System Emulator