All registers and flags reset to 0.

-------------------------------------------------------------------------------
ACC is a signed 20-bit accumulator. In this documentation, it is referred to as if it was 32-bits, but it should be treated as 20 bits MSb-justified. That is, each calculation should clear the bottom 12 bits.

-------------------------------------------------------------------------------
REGADDR[X] refers to an address lookup for register X.
The base address is determined by the value of REGMAP and REGBASE:
	X &= 0xF
	bool bank = false;
	switch(REGMAP) {
		case 0: case 1: case 2: case 3: bank = (X & 4);
		case 4: bank = (X & 8);
		case 5: bank = !(X & 8);
		case 6: bank = (X & 4) && (X & 8);
		case 7: bank = (X & 4) || (X & 8);
	}
	addr = (X & 7) | (bank ? 0x100 : 0) | ((X & 8) ? 0x200 : 0);
	addr ^= REGBASE << 2;

===============================================================================
Public domain 3DO chip documentation, by trap15
Last update 2020-05-09T20:10+09

Knowledge derived from FreeDO source.

FreeDO Project authors:
Alexander Troosh
Maxim Grishin
Allen Wright
John Sammons
Felix Lazarev