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Rainbow.c - near line 310
	UINT8 *rom = memregion("maincpu")->base();

// Test-DEBUG:	rom[0xf5a14]=0xeb; // kill keyboard test result (=>ERROR 50)

// Patches to access international keyboard selector
rom[0xf4174]=0xeb; // jmps  RAINBOW100_LOGO__loc_33D
rom[0xf4175]=0x08; // 

rom[0xf4363]=0x90; // NOP out :   0363 WAIT_FOR_BIT3__loc_35E  
rom[0xf4364]=0x90; //             (do not wait for ??)

// *** UNCOMMENT TO SHOW BOOT SELECTOR:
// rom[0xf4384]=0xeb; // JMPS  to  BOOT80 ( selector )  

// 8088 reads port 0x00. See page 133 (4-34)
READ8_MEMBER(rainbow_state::i8088_latch_r)
{
//    printf("Read %02x from 8088 mailbox\n", m_8088_mailbox);
	m_i8088->set_input_line(INPUT_LINE_INT0, CLEAR_LINE);

	INTZ80L = false; // WAS:  INT88L = false;
	return m_8088_mailbox;
}

// 8088 writes port 0x00. See page 133 (4-34)

// Interprocessor interrupt from the 8088 CPU. The vector placed 
// on the bus is F7 (hex) which causes a 
// RST 30 instruction to be executed in interrupt mode 0.
WRITE8_MEMBER(rainbow_state::i8088_latch_w)
{
//    printf("%02x to Z80 mailbox\n", data);
	m_z80->set_input_line_and_vector(0, ASSERT_LINE, 0xf7);
	m_z80_mailbox = data;

    INTZ80L = true;
}

// Z80 reads port 0x00
// See page 134 (4-35)
READ8_MEMBER(rainbow_state::z80_latch_r)
{
//    printf("Read %02x from Z80 mailbox\n", m_z80_mailbox);
	m_z80->set_input_line(0, CLEAR_LINE);

	INT88L = false; // WAS: INTZ80L = false;
	return m_z80_mailbox;
}

// Z80 writes to port 0x00 - see page 134 (4-35) of TM.
WRITE8_MEMBER(rainbow_state::z80_latch_w)
{
	//    printf("%02x to 8088 mailbox\n", data);
	m_i8088->set_input_line_and_vector(INPUT_LINE_INT0, ASSERT_LINE, 0x27);
	m_8088_mailbox = data;

	INT88L = true;
}