chip8 - CHIP-8 interpreter using C and SDL2.

Age	Commit message (Collapse)	Author	Files	Lines
2020-08-21	correct Fx55 and fx6 opcodes	Daniel Jones	2	-12/+5

2020-08-21	more instructions implemented	Daniel Jones	3	-18/+122
	a good few roms work now, many glitches and such though. some roms wont work
2020-08-19	implemented more instructions	Daniel Jones	1	-5/+71
	these instructions are mostly untested at the moment, i need to test them
2020-08-19	instructions and debugging features	Daniel Jones	2	-12/+59
	added some more instructions, particularly calling and returning from subroutines using the stack. also added stepping through the program using the '.' key to advance one cycle
2020-08-19	begin implementing instructions	Daniel Jones	3	-4/+105
	screen clearing and loading bytes into registers implemented currently
2020-08-18	replace magic numbers with constants	Daniel Jones	3	-13/+21

2020-08-18	move sdl event handling to own function	Daniel Jones	1	-28/+31

2020-08-18	implemented keypad	Daniel Jones	3	-13/+82
	hex keypad is mapped to keys 1234,qwer,asdf,zxcv
2020-08-17	implement pixel XORing and wrapping	Daniel Jones	3	-16/+29
	sprites are properly XOR'd to the display, setting the 0xF register as appropriate. sprites also wrap on the bottom and irght side of the screen. because you can't access negative video memory, wrpaping top to bottom and left to right isn't implemented
2020-08-17	sprite drawing basic implementation	Daniel Jones	3	-4/+62
	begin implementing sprite drawing, currently draws the chip8 fontset well, no idead about other sprites yet
2020-08-16	more initialisation and added the fontset	Daniel Jones	2	-4/+47
	fontset also loaded into memory at 0x0, we have 0x0 to 0x1FF free for anything we want, that is where the interpreter is meant to be
2020-08-16	began chip8 interpreter, reading rom file	Daniel Jones	4	-6/+87

2020-08-16	SDL init stuff, test code	Daniel Jones	4	-0/+796