Apple II + FPGA = fun

Apple II peripheral card pinout






6502 VHDL core
another 6502 VHDL core
 Apple IIe on one FPGA chip
 Updated Apple IIe on one FPGA chip
 PACE project (apple II and other machine emulator) by Mark McDougall
 Gary Becker's Apple II on an FPGA
 C-ONE configurable computer 
Jorge Bieling's video card project
     
The FPGA will hold the 6502 + apple II motherboard
+ other peripherals.

A friend of mine has an ARM 6502 emulator that he
wrote in assembly, he gets 50mhz.  50Mhz is faster 
than any of the FPGA-only projects I've read about 
(above), and it relieves the FPGA of holding the 
6502, leaving more room for other apple II 
peripherals.

apple II:


Storage
 

USB:   USB keys (memory sticks)
(atari guys have a driver for USB storage devices)
IDE storage
(CFFA, Focus, many others have schematics and code 
for IDE interface)

Sound

Phasor (Mockingboard, Echo speech)
Speech recognition:  Covox Voice Master emulation (I 
    have the schematic and software)
heuristic H2000 speech recognition; I have schematic
    and software
stereo audio input (a/d converters)
stereo audio output (a/d converters)
Apple IIgs Ensoniq 

Video

selectable refresh rate
new video modes:
-high resolution memory mapped (how to do color?)
-TMS9918(A) hardware sprite controller
-character ROM hooked to peripheral bus, or through
softswitch, so ROM can be changed by program
1)current apple II video mode data grabber/displayer 
  for VGA (off data bus) 
2)new video modes like the VOC's IIgs SuperHighRes 
  mode 
3)hardware sprite generator, 
4)user definable character ROM in high resolution, 
  for display of high-res characters on 40X24 and 
  80X24 text modes (use winDOS fonts?) 
5)user definable memory mapped text screen horiz/
  vert size
6)user definable resolution and color depth 
7)user definable "RAM to display" (bank#(s), memory 
  location(s)) 

Interrupt Generator

programmable interrupt generator (generate interrupts at 
definable intervals, or interrupts based on peripheral 
card status, or external interrupt input)
interrupt source register:  define an address that holds 
the ID # of the hardware that interrupted:
1)parallel card
2)serial card
3)counter1
4)counter2 etc
6522 emulation (has built in counters that could be used 
for the interrupt generator)

Apple II bus connector

***  Apple II Bus connector on the edge of the new computer **
plug the new computer into an apple II, and it acts as an 
accelerator...  turns your Apple2 into a terminal.  The 
plug in computer has all the RAM, CPU, etc.  Goes to APple 
II bus for video updates (display video through II monitor), 
and peripheral access (joystick, peripheral cards, cassette, 
keyboard, etc)

Extra features

Save State button:  copies all RAM contents to IDE or USB storage device
LOAD state button:  loads RAM with copy from storage device, initializes CPU, etc, 

Legacy support

Disk II, 5.25 DB drive, 3.5 800k support