Function userVideoRom4K

source/NTSC_CharSet.cpp:109–156

//

static void userVideoRom4K(csbits_t csbits, const BYTE* pVideoRom)
{
	int RA = 0;	// rom address
	int i = 0;

	// regular char set

	for (; i<64; i++, RA+=8)		// [00..3F] INVERSE / [40..7F] FLASH
	{
		for (int y=0; y<8; y++)
		{
			csbits[0][i][y]    = pVideoRom[RA+y] ^ 0xff;	// UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
			csbits[0][i+64][y] = pVideoRom[RA+y] ^ 0xff;	// UTAIIe:8-14 (Table 8.3) we use FLASH=0, so RA=00ccccccsss
		}
	}

	RA = (1<<10 | 0<<9);									// UTAIIe:8-14 (Table 8.3)

	for (i=128; i<256; i++, RA+=8)	// [80..BF] NORMAL
	{
		for (int y=0; y<8; y++)
		{
			csbits[0][i][y] = pVideoRom[RA+y] ^ 0xff;		// UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
		}
	}

	RA = (1<<10 | 1<<9);									// UTAIIe:8-14 (Table 8.3)

	for (i=192; i<256; i++, RA+=8)	// [C0..FF] NORMAL
	{
		for (int y=0; y<8; y++)
		{
			csbits[0][i][y] = pVideoRom[RA+y] ^ 0xff;		// UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
		}
	}

	// alt char set

	RA = 0;

	for (i=0; i<256; i++, RA+=8)	// [00..7F] INVERSE / [80..FF] NORMAL
	{
		for (int y=0; y<8; y++)
		{
			csbits[1][i][y] = pVideoRom[RA+y] ^ 0xff;		// UTAIIe:8-11 "dot patterns in the video ROM are inverted..."
		}
	}
}

static void userVideoRomForIIe(void)
{