Changes
/* 16 bit */
* 4096 instead of 512 colour palette
* Fine Horizontal and Vertical hardware scrolling
* Blitter, same as in the Mega ST
* Stereo 8-bit PCM sound using DMA, with variable rate (50, 25, 12.5 and 6.25KHz)
* 256KB ROM instead of 192KB, containing the TOS
