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(MESS) sbc6510: Reduce tagmap lookups (nw)

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This commit is contained in:
Wilbert Pol 2013-02-09 12:15:58 +00:00
parent 77b5c79c89
commit 6b0fc57095
1 changed files with 21 additions and 6 deletions
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27
src/mess/drivers/sbc6510.c
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@ -72,7 +72,11 @@ public:
UINT8 m_key_row;
UINT8 m_2;
required_device<generic_terminal_device> m_terminal;
virtual void machine_start();
virtual void machine_reset();
protected:
ioport_port *m_io_port[8];
};
@ -194,6 +198,17 @@ static GENERIC_TERMINAL_INTERFACE( terminal_intf )
};
void sbc6510_state::machine_start()
{
char kbdrow[6];
for ( int i = 0; i < 8; i++ )
{
sprintf(kbdrow,"X%X",i);
m_io_port[i] = ioport(kbdrow);
}
}
void sbc6510_state::machine_reset()
{
}
@ -221,14 +236,14 @@ static const ay8910_interface sbc6510_ay_interface =
READ8_MEMBER( sbc6510_state::key_r )
{
UINT8 i,data=0;
char kbdrow[6];
UINT8 data=0;
for (i = 0; i < 8; i++)
if (!BIT(m_key_row, i))
for (int i = 0; i < 8; i++)
{
sprintf(kbdrow,"X%X",i);
data |= ioport(kbdrow)->read();
if (!BIT(m_key_row, i))
{
data |= m_io_port[i]->read();
}
}
return ~data;
}