Apple II+ emulator

Portable emulator of an Apple II+. Written in Go.

Features

• Apple II+ with 48Kb of base RAM
• Sound
• 16 Sector diskettes in DSK format
• Emulated extension cards:
  • DiskII controller
  • 16Kb Language Card
  • 256Kb Saturn RAM
  • ThunderClock Plus real time clock
• Graphic modes:
  • Text, Lores and Hires
• Displays:
  • Green monochrome monitor with half width pixel support
  • NTSC Color TV (extracting the phase from the mono signal)
  • ANSI Console, avoiding the SDL2 dependency
• Adjustable speed.
• Fast disk mode to set max speed while using the disks.
• Single file executable with embedded ROMs and DOS 3.3
• Optional emulation of the clone Base64A by Copam
• Joystick support. Up to two joysticks or four paddles.

Running the emulator

No installation required. Download the single file executable apple2xxx_xxx for linux or Mac, SDL2 graphics or console.

Default mode

Execute without parameters to have an emulated Apple II+ with 64kb booting DOS 3.3 ready to run Applesoft:

casa@servidor:~$ ./apple2sdl

Play games

Download a DSK file locally or use an URL (Asimov is an excellent source) with the -disk parameter:

casa@servidor:~$ ./apple2sdl -disk "https://www.apple.asimov.net/images/games/action/karateka/karateka (includes intro).dsk"

Terminal mode

To run text mode right on the terminal without the SDL2 dependency, use apple2console. It runs on the console using ANSI escape codes. Input is sent to the emulated Apple II one line at a time:

casa@servidor:~$ ./apple2console

############################################
#                                          #
#                APPLE II                  #
#                                          #
#     DOS VERSION 3.3  SYSTEM MASTER       #
#                                          #
#                                          #
#            JANUARY 1, 1983               #
#                                          #
#                                          #
# COPYRIGHT APPLE COMPUTER,INC. 1980,1982  #
#                                          #
#                                          #
# ]10 PRINT "HELLO WORLD"                  #
#                                          #
# ]LIST                                    #
#                                          #
# 10  PRINT "HELLO WORLD"                  #
#                                          #
# ]RUN                                     #
# HELLO WORLD                              #
#                                          #
# ]_                                       #
#                                          #
#                                          #
############################################
Line: 

Keys

• F5: Toggle speed between real and fastest
• F6: Toggle between NTSC color TV and green phosphor monochrome monitor
• F7: Save current state to disk
• F8: Restore state from disk
• F10: Cycle character generator codepages. Only if the character generator ROM has more than one 2Kb page.
• F12: Save a screen snapshot to a file snapshot.png

Only valid on SDL mode

Command line options

  -base64a
        setup a Base64A clone
  -charRom string
        rom file for the character generator (default "<internal>/Apple2rev7CharGen.rom")
  -disk string
        file to load on the first disk drive (default "<internal>/dos33.dsk")
  -disk2Slot int
        slot for the disk driver. -1 for none. (default 6)
  -diskRom string
        rom file for the disk drive controller (default "<internal>/DISK2.rom")
  -dumpChars
        shows the character map
  -fastDisk
        set fast mode when the disks are spinning (default true)
  -languageCardSlot int
        slot for the 16kb language card. -1 for none
  -mhz float
        cpu speed in Mhz, use 0 for full speed. Use F5 to toggle. (default 1.0227142857142857)
  -mono
        emulate a green phosphor monitor instead of a NTSC color TV. Use F6 to toggle.
  -panicss
        panic if a not implemented softswitch is used
  -rom string
        main rom file (default "<internal>/Apple2_Plus.rom")
  -saturnCardSlot int
        slot for the 256kb Saturn card. -1 for none (default -1)
  -thunderClockCardSlot int
        slot for the ThunderClock Plus card. -1 for none (default 5)
  -traceCpu
        dump to the console the CPU execution 
  -traceSS
        dump to the console the sofswitches calls

Building from source

apple2console

The only dependency is having a working Go installation on any platform.

Run:

$ go get github.com/ivanizag/apple2/apple2console 
$ go build github.com/ivanizag/apple2/apple2console 

apple2sdl

Besides having a working Go installation, install the SDL2 developer files. Valid for any platform

Run:

$ go get github.com/ivanizag/apple2/apple2sdl
$ go build github.com/ivanizag/apple2/apple2sdl 

Cross compile apple2sdl.exe for Windows in Ubuntu

Install the mingw cross compile tools and the SDL2 Windows libs for mingw.

$ sudo apt install mingw-w64
$ wget https://www.libsdl.org/release/SDL2-devel-2.0.9-mingw.tar.gz
$ tar -xzf SDL2-devel-2.0.9-mingw.tar.gz
$ sudo cp -r SDL2-2.0.9/x86_64-w64-mingw32/* /usr/x86_64-w64-mingw32

Compile:

$ env CGO_ENABLED=1 CC=x86_64-w64-mingw32-gcc GOOS=windows CGO_LDFLAGS="-L/usr/x86_64-w64-mingw32/lib -lSDL2 --verbose" CGO_FLAGS="-I/usr/x86_64-w64-mingw32/include -D_REENTRANT" go build -o apple2sdl.exe -x github.com/ivanizag/apple2/apple2sdl

To run the executable in Windows, copy the file SDL2.dll on the same folder. The latest SDL2.dll can be found in the Runtime binary for Windows 64-bit.