Apple2e

Yet another Apple //e emulator.

I wrote this not because the world needed another //e emulator, but because I wanted to have the fun of building a thing from scratch to run my old Apple //e software.

At the time of writing, the emulator handles only 40-column text mode and no floppy.

There are several AppleSoft files in this project (*.A) that can be copied into the clipboard and then pasted into the emulator window with CMD-V.

Thanks to Lawrence Kesteloot for keyboard code, and Bart Grantham for extracting all our old floppy disk images!

Thanks to Mike Chambers (miker00lz@gmail.com) for his 6502 CPU emulator, which I used as a reference when mine hung on "PRINT 5".

Requirements for building:

• GLFW
• libao
• OpenGL 3.2-compatible system
• C++11
• Currently the project only builds on MacOSX because of the linker line in Makefile. keyboard.cpp is UNIX-specific but could be stubbed on other platforms.

On MacOSX with MacPorts, the GLFW and libao dependency can be satisfied with glfw and libao ports. According to https://support.apple.com/en-us/HT202823, almost all modern Macs should have OpenGL 3.2 or later. On my machine, I've been compiling with a g++ that outputs Apple LLVM version 8.0.0 (clang-800.0.42.1) for g++ -v.

Usage:

apple2e [options] <romfile>

Options:

-debugger # start in the debugger
-fast     # start with CPU running as fast as it can run
-noaudio  # stream no audio buffers

Useful debugger commands:

reset # Press CTRL-RESET
reboot # Press CTRL-OpenApple-RESET
fast # run CPU as fast as it can go
slow # Approximate CPU at 1.023 MHz
debug N # Set debug flags to N (decimal). See apple2e.cpp for flags
go # Exit debugging, free-run.  Press CTRL-B to break back into the debugger
# Enter a blank line to step one instruction

If no joystick or gamepad is configured, the Apple 2 screen acts as a joystick. To configure a joystick, store the GLFW numbers of the two axes and two buttons in "joystick.ini".