Changes
/* Components */
PWM chip is [http://www.fpga4fun.com/PWM_DAC.html PWM_DAC fpga4fun] one. Warning, using PWM is lowcost but is low quality sound, in fact if sound is stopped at 50% of voltage, it generates ultrasound (cause it can't really make 2.5v with only two output 0v and 5v), so you can hear whistle. A solution is to buy a pmod DAC or a pmod sound output (not tested)
PS/2 keyboard has internal hardware timeout, it can be shown using game "Macadam" (pinball), so you have to use joystick... But as [http://www.syntiac.com/fpga64.html FPGA64] succeed with that, I have to rebuild this component.
VGA display component use same parameters than unix '''modeline''' command
