GitHub - gardners/apple2efpga: FPGA implementation of an Apple//e (enhanced)

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FPGA implementation of an Apple//e (enhanced)

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Name		Name	Last commit message	Last commit date
Latest commit History 80 Commits
de2		de2
disk2nib		disk2nib
dos33		dos33
mist		mist
mockingboard		mockingboard
roms		roms
t65		t65
.gitignore		.gitignore
PS2_Ctrl.vhd		PS2_Ctrl.vhd
R65Cx2.vhd		R65Cx2.vhd
README.txt		README.txt
README.zorig		README.zorig
apple2.vhd		apple2.vhd
bios.a65		bios.a65
bios.rom		bios.rom
disk_ii.vhd		disk_ii.vhd
disk_ii_rom.vhd		disk_ii_rom.vhd
keyboard.vhd		keyboard.vhd
spi_controller.vhd		spi_controller.vhd
spram.vhd		spram.vhd
timing_generator.vhd		timing_generator.vhd
timing_testbench.vhd		timing_testbench.vhd
tv_controller.vhd		tv_controller.vhd
video_generator.vhd		video_generator.vhd

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This the MiST port of a reconstruction of an 1980s-era Apple //e (enhanced) implemented in VHDL for FPGAs.
The project based on an Apple ][+ FPGA implementation.
Original for the DE2: http://www1.cs.columbia.edu/~sedwards/apple2fpga/
Port for the MiST: http://ws0.org/tag/apple2/

Features:
- Disk loading via osd (no write support yet)
- Tape loading via the UART RX pin
- Selectable 6502 or 65C02 CPU
- Joystick support
- RGB (optionally scandoubled for VGA) or YPbPr output
- Color, amber, green and black&white monitor
- 64K base + 64K auxilary RAM with 80 column and double hi-res support
- Mockingboard model A (two AY-3-8913 chips for six audio channels) in slot 4

On the "Apple //e" boot screen open the OSD with F12 and choose a nibblelized disk. It will boot
the disk automatically. Use dsk2nib to convert AppleII disk images to .nib images. 
The disk emulation is read only.

If you press reset (the right button on the MiST) you'll enter Applesoft with the ] prompt.
From here you have the Applesoft BASIC. See: http://www.landsnail.com/a2ref.htm
If you want to boot another disk choose a .nib image via the osd and type the following:

]PR#6

or

]CALL -151
*C600G

The call command will enter the Monitor. Type the call a second time if the * prompt won't
show the first time. 
At the Monitor you can also type 6 and then Ctrl-P followed by return.
See http://vectronicsappleworld.com/appleii/dos.html#bootdos