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/*
* Matsushita CR-589
*
*/
#include "emu.h"
#include "machine/cr589.h"
// device type definition
const device_type CR589 = &device_creator<cr589_device>;
cr589_device::cr589_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: scsicd_device(mconfig, CR589, "CR589", tag, owner, clock)
{
}
static const int identity_offset = 0x3ab;
static const char download_identity[] = "MATSHITA CD98Q4 DOWNLOADGS0N";
void cr589_device::device_start()
{
scsicd_device::device_start();
download = 0;
memcpy( &buffer[ identity_offset ], "MATSHITACD-ROM CR-589 GS0N", 28 );
save_item(NAME(download));
save_item(NAME(buffer));
save_item(NAME(bufferOffset));
}
void cr589_device::ExecCommand( int *transferLength )
{
switch( command[ 0 ] )
{
case 0x3b: // WRITE BUFFER
bufferOffset = ( command[ 3 ] << 16 ) | ( command[ 4 ] << 8 ) | command[ 5 ];
SetPhase( SCSI_PHASE_DATAOUT );
*transferLength = ( command[ 6 ] << 16 ) | ( command[ 7 ] << 8 ) | command[ 8 ];
break;
case 0x3c: // READ BUFFER
bufferOffset = ( command[ 3 ] << 16 ) | ( command[ 4 ] << 8 ) | command[ 5 ];
SetPhase( SCSI_PHASE_DATAIN );
*transferLength = ( command[ 6 ] << 16 ) | ( command[ 7 ] << 8 ) | command[ 8 ];
break;
case 0xcc: // FIRMWARE DOWNLOAD ENABLE
SetPhase( SCSI_PHASE_DATAOUT );
*transferLength = SCSILengthFromUINT16( &command[7] );
break;
default:
scsicd_device::ExecCommand( transferLength );
}
}
void cr589_device::ReadData( UINT8 *data, int dataLength )
{
switch( command[ 0 ] )
{
case 0x12: // INQUIRY
scsicd_device::ReadData( data, dataLength );
if( download )
{
memcpy( &data[ 8 ], download_identity, 28 );
}
else
{
memcpy( &data[ 8 ], &buffer[ identity_offset ], 28 );
}
break;
case 0x3c: // READ BUFFER
memcpy( data, &buffer[ bufferOffset ], dataLength );
bufferOffset += dataLength;
break;
default:
scsicd_device::ReadData( data, dataLength );
break;
}
}
void cr589_device::WriteData( UINT8 *data, int dataLength )
{
switch( command[ 0 ] )
{
case 0x3b: // WRITE BUFFER
memcpy( &buffer[ bufferOffset ], data + 32, dataLength - 32 );
bufferOffset += dataLength;
break;
case 0xcc: // FIRMWARE DOWNLOAD ENABLE
if( memcmp( data, &buffer[ identity_offset ], 28 ) == 0 )
{
download = 1;
}
else if( memcmp( data, download_identity, 28 ) == 0 )
{
download = 0;
}
break;
default:
scsicd_device::WriteData( data, dataLength );
break;
}
}
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