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gambl186: implement communication with EEPROM [Peter Ferrie]

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service mode passes now, until the memory clear.

nw: funnily enough, it's not the cause of the "No Funzione" screen,
which still appears.
This commit is contained in:
Peter Ferrie 2015-04-28 08:03:33 -07:00
parent 6b1e2efcec
commit 65b5d2a623
1 changed files with 53 additions and 4 deletions
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57
src/mame/drivers/gambl186.c
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@ -41,8 +41,12 @@ public:
m_maincpu(*this, "maincpu") { }
required_device<cpu_device> m_maincpu;
int m_comms_state;
int m_comms_ind;
UINT8 m_comms_data[1002];
DECLARE_READ16_MEMBER(unk_r);
DECLARE_READ16_MEMBER(comms_r);
DECLARE_WRITE16_MEMBER(comms_w);
};
@ -54,9 +58,54 @@ static ADDRESS_MAP_START( gambl186_map, AS_PROGRAM, 16, gambl186_state )
AM_RANGE(0xc0000, 0xfffff) AM_ROM AM_REGION("ipl",0)
ADDRESS_MAP_END
READ16_MEMBER(gambl186_state::unk_r)
READ16_MEMBER(gambl186_state::comms_r)
{
return machine().rand();
if ((offset == 0) && ACCESSING_BITS_0_7) //port 680 == data
{
if ((m_comms_state == 0x16) && (m_comms_ind < sizeof(m_comms_data)))
{
return m_comms_data[m_comms_ind++];
}
}
else if (offset == 1) //port 681 == status
{
if (m_comms_state == 0x16) //read mode?
{
return 2;
}
else if (m_comms_state == 0x31) //write mode?
{
return 4;
}
}
return 0;
}
WRITE16_MEMBER(gambl186_state::comms_w)
{
if (offset == 0)
{
if ((m_comms_state == 0x31) && (m_comms_ind < (sizeof(m_comms_data) - 2)))
{
m_comms_data[++m_comms_ind] = (UINT8) ~data;
}
}
else if (offset == 1)
{
if (m_comms_state != data)
{
m_comms_ind = 0;
}
m_comms_state = data;
if (data == 0x4e) //reset?
{
m_comms_data[0] = 5;
m_comms_data[sizeof(m_comms_data) - 1] = 0xec;
}
}
}
static ADDRESS_MAP_START( gambl186_io, AS_IO, 16, gambl186_state )
@ -73,7 +122,7 @@ static ADDRESS_MAP_START( gambl186_io, AS_IO, 16, gambl186_state )
AM_RANGE(0x0582, 0x0583) AM_READ_PORT("DSW1")
AM_RANGE(0x0584, 0x0585) AM_READ_PORT("DSW2") AM_WRITENOP // ???
AM_RANGE(0x0600, 0x0603) AM_WRITENOP // lamps
AM_RANGE(0x0680, 0x0683) AM_READ(unk_r) // ???
AM_RANGE(0x0680, 0x0683) AM_READWRITE(comms_r, comms_w)
ADDRESS_MAP_END