NES 6502

The NES 6502 is a version of the 6502 that ignores the state of the decimal flag when performing arithmetic.

10,000 tests are provided per opcode. All tests assume a full 64kb of uniquely-mapped RAM is mapped to the processor; this deviates from the actual memory layout of a NES regardless of the cartridge in use.

Sample test:

{
	"name": "b1 71 8b",
	"initial": {
		"pc": 9023,
		"s": 240,
		"a": 47,
		"x": 162,
		"y": 170,
		"p": 170,
		"ram": [
			[9023, 177],
			[9024, 113],
			[9025, 139],
			[113, 169],
			[114, 89],
			[22867, 214],
			[23123, 37]
		]
	},
	"final": {
		"pc": 9025,
		"s": 240,
		"a": 37,
		"x": 162,
		"y": 170,
		"p": 40,
		"ram": [
			[113, 169],
			[114, 89],
			[9023, 177],
			[9024, 113],
			[9025, 139],
			[22867, 214],
			[23123, 37]
		]
	},
	"cycles": [
		[9023, 177, "read"],
		[9024, 113, "read"],
		[113, 169, "read"],
		[114, 89, "read"],
		[22867, 214, "read"],
		[23123, 37, "read"]
	]
}

name is provided for human consumption and has no formal meaning.

initial is the initial state of the processor; ram contains a list of values to store in memory prior to execution, each one in the form [address, value].

final is the state of the processor and relevant memory contents after execution.

cycles provides a cycle-by-cycle breakdown of bus activity in the form [address, value, type] where type is either read or write.