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(MESS) Uses the IO line from the SASI bus to determine the direction of the SASI data port. This seems the most likely way the hardware works. [smf]

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This commit is contained in:
smf- 2012-10-07 23:07:44 +00:00
parent 95dcf93a69
commit c683bc7181
2 changed files with 30 additions and 2 deletions
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26
src/mess/drivers/v1050.c
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@ -345,6 +345,28 @@ WRITE8_MEMBER( v1050_state::dvint_clr_w )
m_subcpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE);
}
WRITE8_MEMBER( v1050_state::sasi_data_w )
{
data_out = data;
if( m_sasibus->scsi_io_r() != 0 )
{
m_sasibus->scsi_data_w( data );
}
}
WRITE_LINE_MEMBER( v1050_state::sasi_io_w )
{
if( state != 0 )
{
m_sasibus->scsi_data_w( data_out );
}
else
{
m_sasibus->scsi_data_w( 0xff );
}
}
READ8_MEMBER( v1050_state::sasi_status_r )
{
/*
@ -447,7 +469,7 @@ static ADDRESS_MAP_START( v1050_io, AS_IO, 8, v1050_state )
AM_RANGE(0xb0, 0xb0) AM_READWRITE(dint_clr_r, dint_clr_w)
AM_RANGE(0xc0, 0xc0) AM_WRITE(v1050_i8214_w)
AM_RANGE(0xd0, 0xd0) AM_WRITE(bank_w)
AM_RANGE(0xe0, 0xe0) AM_DEVREADWRITE(SASIBUS_TAG ":host", scsicb_device, scsi_data_r, scsi_data_w)
AM_RANGE(0xe0, 0xe0) AM_WRITE(sasi_data_w) AM_DEVREAD(SASIBUS_TAG ":host", scsicb_device, scsi_data_r)
AM_RANGE(0xe1, 0xe1) AM_READWRITE(sasi_status_r, sasi_ctrl_w)
ADDRESS_MAP_END
@ -989,7 +1011,7 @@ static const SCSICB_interface sasi_intf =
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,
DEVCB_DRIVER_LINE_MEMBER(v1050_state, sasi_io_w),
DEVCB_NULL,
DEVCB_NULL,
DEVCB_NULL,

6
src/mess/includes/v1050.h
View File

@ -128,6 +128,8 @@ public:
DECLARE_READ8_MEMBER( videoram_r );
DECLARE_WRITE8_MEMBER( videoram_w );
DECLARE_WRITE_LINE_MEMBER( crtc_vs_w );
DECLARE_WRITE8_MEMBER(sasi_data_w);
DECLARE_WRITE_LINE_MEMBER(sasi_io_w);
DECLARE_READ8_MEMBER( sasi_status_r );
DECLARE_WRITE8_MEMBER( sasi_ctrl_w );
@ -157,6 +159,10 @@ public:
required_shared_ptr<UINT8> m_video_ram; // video RAM
UINT8 *m_attr_ram; // attribute RAM
UINT8 m_attr; // attribute latch
// sasi state
UINT8 data_out;
TIMER_DEVICE_CALLBACK_MEMBER(v1050_keyboard_tick);
TIMER_DEVICE_CALLBACK_MEMBER(sasi_ack_tick);
TIMER_DEVICE_CALLBACK_MEMBER(sasi_rst_tick);