a short fun project

import os
os.environ['PYGAME_HIDE_SUPPORT_PROMPT'] = "hide"
import pygame
from cpu import getPC, getVRAM, cpu_8080, loadROM, memory, getREGS, getSP, getFLAGS, loadSI, setKeys, interrupt


def ppu(screen, surface):
    surface = pygame.Surface((256, 224))
    pa = pygame.PixelArray(surface)
    vram = getVRAM()
    for y in range(224):
        for x in range(256):
            white = vram[y*0x20+x//8] >> (x % 8) & 1
            if white != 0:
                pa[x,y] = (255, 255, 255)
            else:
                pa[x,y] = (0, 0, 0)
    del pa
    surface = pygame.transform.scale(surface, (512, 448))
    surface = pygame.transform.rotate(surface, 90)
    screen.blit(surface, (0,0))


def main():
    loadSI()

	# initialize the pygame module
    pygame.init()
    # set title
    pygame.display.set_caption("[ q00.si - space invaders arcade emuladore ]")
     
    # create a surface on screen that has the size of 240 x 180
    screen = pygame.display.set_mode((448,512))	# orig size is 256 / 224
    surface = pygame.Surface((256, 224))
    pa = pygame.PixelArray(surface)
    vram = getVRAM()
    for y in range(224):
    	for x in range(256):
            white = vram[y*0x20+x//8] >> (7-(x % 8)) & 1
            if white != 0:
                pa[x,y] = (255, 255, 255)
            else:
                pa[x,y] = (0, 0, 0)
    del pa
    surface = pygame.transform.scale(surface, (512, 448))
    screen.blit(surface, (0,0))
     
    # define a variable to control the main loop
    running = True
     
    # main loop
    cnt = 0
    last_cnt = 0
    frame = 0
    while running:
        # event handling, gets all event from the event queue
        L = 0
        R = 0
        F = 0
        C = 0
        ST = 0
        for event in pygame.event.get():
            # only do something if the event is of type QUIT
            if event.type == pygame.QUIT:
                # change the value to False, to exit the main loop
                running = False
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    print("Left")
                    L = 1
                if event.key == pygame.K_RIGHT:
                    print("Right")
                    R = 1
                if event.key == pygame.K_SPACE:
                    print("Space")
                    F = 1
                if event.key == pygame.K_RETURN:
                    print("Return")
                    C = 1
                if event.key == pygame.K_ESCAPE:
                    print("Escape")
                    ST = 1
                setKeys(L, R, F, C, ST)
        #   step PPU
        if cnt > 16640 and last_cnt <= 16640:
            interrupt(0x08)
        if cnt > 33280:
            cnt = cnt - 33280
            interrupt(0x10)
            ppu(screen, surface)
            pygame.display.update()
        #   step CPU    
        last_cnt = cnt
        cnt = cnt + cpu_8080[memory[getPC()]]()

# run the main function only if this module is executed as the main script
# (if you import this as a module then nothing is executed)
if __name__=="__main__":
	# call the main function
    main()

def loadROM(file):
	with open(file, "rb") as f:
		res = f.read()
		c = 0
		for r in res:
			memory[0x100 + c] = r
			c = c + 1
	memory[0x7] = 0xc9 # patch
	memory[0x5] = 0xd3 # patch
	memory[0x6] = 0x01 # patch
	memory[0x0] = 0xd3 # patch