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https://github.com/holub/mame
synced 2025-04-24 01:11:11 +03:00
gambl186: update communication with EEPROM [Peter Ferrie]
service mode works properly, game starts booting. still missing memory banking, so boot hangs.
This commit is contained in:
Peter Ferrie
parent
f7ad401001
commit
86455d8771
@ -20,10 +20,15 @@ U3 Max691cpe
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U300 Nec D7759GC (10Mhz xtal near it)
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TODO:
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- No idea about how to surpass the "No Funzione" (sic) screen. According to the bad settings almost
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surely it wants EEPROM hooked up (i/o at 0x680/0x682?)
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In order to get the game to run, follow these steps:
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- enable service mode
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- run all of the tests (press '1' repeatedly to progress)
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- at the "cancellare la memoria" prompt, press 'X' to allow it
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- when the line of '*' appears, press the buttons in the following sequence:
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1 1 X X 1 1 1 X X X 1 1 X 1 1 1 1 X 1 1 1 1 1 X 1 1 1 1 1 1 X
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(This is the "password" for the EEPROM. You have three attempts to get it correct, otherwise the service mode will restart)
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- if accepted, disable service mode DIP switch
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- reset machine (press 'F3')
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*/
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@ -41,9 +46,13 @@ public:
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m_maincpu(*this, "maincpu") { }
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required_device<cpu_device> m_maincpu;
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int m_comms_state;
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int m_comms_state;
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int m_comms_ind;
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UINT8 m_comms_data[1002];
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int m_comms_cmd;
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int m_comms_expect;
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int m_comms_blocks;
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bool m_comms_ack;
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DECLARE_READ16_MEMBER(comms_r);
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DECLARE_WRITE16_MEMBER(comms_w);
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@ -58,54 +67,162 @@ static ADDRESS_MAP_START( gambl186_map, AS_PROGRAM, 16, gambl186_state )
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AM_RANGE(0xc0000, 0xfffff) AM_ROM AM_REGION("ipl",0)
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ADDRESS_MAP_END
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static const UINT8 password[] = {5, 2, 0, 3, 0, 0, 2, 4, 5, 6, 0x16};
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READ16_MEMBER(gambl186_state::comms_r)
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{
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if ((offset == 0) && ACCESSING_BITS_0_7) //port 680 == data
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{
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if ((m_comms_state == 0x16) && (m_comms_ind < sizeof(m_comms_data)))
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{
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return m_comms_data[m_comms_ind++];
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}
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}
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else if (offset == 1) //port 681 == status
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{
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if (m_comms_state == 0x16) //read mode?
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{
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return 2;
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}
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else if (m_comms_state == 0x31) //write mode?
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{
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return 4;
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}
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}
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UINT16 retval = 0;
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return 0;
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if ((offset == 0) && ACCESSING_BITS_0_7) //port 680 == data
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{
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if (m_comms_state == 0x16) //read mode, just in case
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{
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if (!m_comms_ind && (m_comms_cmd == 0xff))
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{
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m_comms_cmd = m_comms_data[1];
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switch (m_comms_cmd)
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{
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case 0:
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{
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m_comms_expect = 4;
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break;
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}
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case 1: //unverified
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case 3: //unverified
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{
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m_comms_expect = 8;
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break;
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}
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case 2:
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{
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m_comms_expect = 408;
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m_comms_data[401] = 0x34; //precalc
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m_comms_blocks = 4;
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break;
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}
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case 4:
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{
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m_comms_expect = 4;
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break;
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}
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case 5: //unverified
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{
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m_comms_expect = 7;
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break;
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}
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case 6:
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{
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m_comms_expect = 1003;
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m_comms_data[1001] = 0xec; //precalc
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break;
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}
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default: //unverified
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{
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m_comms_expect = 1;
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}
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}
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}
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if (m_comms_ind < sizeof(m_comms_data))
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{
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if ((m_comms_cmd == 4) && (m_comms_ind == 1) && !memcmp(m_comms_data, password, sizeof(password)))
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{
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m_comms_data[1] = 0x55;
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m_comms_data[2] = 0x55;
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}
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retval = m_comms_data[m_comms_ind++];
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if (m_comms_expect && !--m_comms_expect)
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{
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if (!m_comms_blocks || !--m_comms_blocks)
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{
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m_comms_cmd = 0xff;
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}
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else if (m_comms_cmd == 2)
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{
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if (m_comms_blocks == 3)
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{
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m_comms_expect = 5;
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m_comms_data[4] = 0x17; //precalc
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}
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else
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{
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m_comms_expect = 3;
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m_comms_data[2] = 5; //precalc
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}
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}
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m_comms_ack = true;
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}
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}
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}
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}
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else if (offset == 1) //port 681 == status
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{
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if (m_comms_state == 0x16) //read mode
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{
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retval = 2; //read ready
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}
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else if (m_comms_state == 0x31) //write mode
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{
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retval = 4; //write ready
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}
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}
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return retval;
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}
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WRITE16_MEMBER(gambl186_state::comms_w)
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{
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if (offset == 0)
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{
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if ((m_comms_state == 0x31) && (m_comms_ind < (sizeof(m_comms_data) - 2)))
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{
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m_comms_data[++m_comms_ind] = (UINT8) ~data;
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}
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}
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else if (offset == 1)
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{
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if (m_comms_state != data)
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{
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m_comms_ind = 0;
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}
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if (offset == 0)
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{
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if ((m_comms_state == 0x31) && (m_comms_ind < 1000))
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{
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if (!m_comms_ack || (data == 0x15)) //validation failure
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{
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if (m_comms_cmd == 6) //1000 bytes transfer
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{
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data = ~data;
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}
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else if (m_comms_ack)
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{
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m_comms_cmd = 0xfe;
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m_comms_expect = 2;
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data = 5;
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}
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m_comms_state = data;
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m_comms_data[++m_comms_ind] = (UINT8) data;
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}
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if (data == 0x4e) //reset?
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{
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m_comms_data[0] = 5;
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m_comms_data[sizeof(m_comms_data) - 1] = 0xec;
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}
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}
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m_comms_ack = false;
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}
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}
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else if (offset == 1)
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{
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if (m_comms_state != data) //detect transition
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{
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m_comms_ind = 0;
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if (data == 0x4e) //reset
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{
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m_comms_data[0] = 5; //operation complete
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m_comms_cmd = 0xff; //none
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m_comms_expect = 0;
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m_comms_blocks = 0;
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m_comms_ack = false;
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}
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}
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m_comms_state = data;
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}
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}
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static ADDRESS_MAP_START( gambl186_io, AS_IO, 16, gambl186_state )
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