1.1 --- a/src/asic.c	Fri Dec 15 10:17:30 2006 +0000
     1.2 +++ b/src/asic.c	Fri Dec 15 10:18:39 2006 +0000
     1.3 @@ -1,5 +1,5 @@
     1.4  /**
     1.5 - * $Id: asic.c,v 1.19 2006-08-01 21:56:48 nkeynes Exp $
     1.6 + * $Id: asic.c,v 1.20 2006-12-15 10:18:39 nkeynes Exp $
     1.7   *
     1.8   * Support for the miscellaneous ASIC functions (Primarily event multiplexing,
     1.9   * and DMA). 
    1.10 @@ -311,7 +311,7 @@
    1.11  	    idereg.device = (uint8_t)val;
    1.12  	break;
    1.13      case IDECMD:
    1.14 -	if( ide_can_write_regs() ) {
    1.15 +	if( ide_can_write_regs() || val == IDE_CMD_NOP ) {
    1.16  	    ide_write_command( (uint8_t)val );
    1.17  	}
    1.18  	break;

     2.1 --- a/src/gdrom/ide.c	Fri Dec 15 10:17:30 2006 +0000
     2.2 +++ b/src/gdrom/ide.c	Fri Dec 15 10:18:39 2006 +0000
     2.3 @@ -1,5 +1,5 @@
     2.4  /**
     2.5 - * $Id: ide.c,v 1.16 2006-06-18 12:01:53 nkeynes Exp $
     2.6 + * $Id: ide.c,v 1.17 2006-12-15 10:18:39 nkeynes Exp $
     2.7   *
     2.8   * IDE interface implementation
     2.9   *
    2.10 @@ -337,6 +337,13 @@
    2.11      ide_clear_interrupt();
    2.12      idereg.command = val;
    2.13      switch( val ) {
    2.14 +    case IDE_CMD_NOP: /* Effectively an "abort" */
    2.15 +	idereg.state = IDE_STATE_IDLE;
    2.16 +	idereg.status = 0x51;
    2.17 +	idereg.error = 0x04;
    2.18 +	idereg.data_offset = -1;
    2.19 +	ide_raise_interrupt();
    2.20 +	return;
    2.21      case IDE_CMD_RESET_DEVICE:
    2.22  	ide_reset();
    2.23  	break;

     3.1 --- a/src/gdrom/ide.h	Fri Dec 15 10:17:30 2006 +0000
     3.2 +++ b/src/gdrom/ide.h	Fri Dec 15 10:18:39 2006 +0000
     3.3 @@ -1,5 +1,5 @@
     3.4  /**
     3.5 - * $Id: ide.h,v 1.8 2006-05-23 13:11:45 nkeynes Exp $
     3.6 + * $Id: ide.h,v 1.9 2006-12-15 10:18:39 nkeynes Exp $
     3.7   *
     3.8   * This file defines the interface and structures of the dreamcast's IDE 
     3.9   * port. Note that the register definitions are in asic.h, as the registers
    3.10 @@ -84,6 +84,7 @@
    3.11  #define IDE_CTL_RESET 0x04
    3.12  #define IDE_CTL_IRQEN 0x02 /* IRQ enabled when == 0 */
    3.13  
    3.14 +#define IDE_CMD_NOP 0x00
    3.15  #define IDE_CMD_RESET_DEVICE 0x08
    3.16  #define IDE_CMD_PACKET 0xA0
    3.17  #define IDE_CMD_IDENTIFY_PACKET_DEVICE 0xA1