PPI chip is CPCWiki one, patched.
PWM chip is fpga4fun one.
VGA display component use same parameters than unix '''modeline''' command
Big components as SPI on BOOTLOAD use state-machine led debug : an integer contain the state of state machine, and this integer is displayed on 8 leds so you know where you are, it's for that I had several crash state in order to understand why and where component crash.
Be careful of physical IBM ROM that as is plug on bottom of physical RAM can put death bit for some address. In fact my 8th byte is death, '''it's why I turn always my upper RAM address bit into 1'''. I think that I have written on a ghost part of ROM, and it was fatal...