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misc, trying to understand comms (nw)

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This commit is contained in:
David Haywood 2014-06-04 11:24:58 +00:00
parent 08247d1690
commit 2073e3e6fb
1 changed files with 63 additions and 28 deletions
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91
src/mame/drivers/kenseim.c
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@ -139,12 +139,19 @@ class kenseim_state : public cps_state
public:
kenseim_state(const machine_config &mconfig, device_type type, const char *tag)
: cps_state(mconfig, type, tag),
m_to_68k_cmd(0)
m_to_68k_cmd_low(0),
m_to_68k_cmd_d9(0),
m_to_68k_cmd_req(0),
m_to_68k_cmd_LVm(0),
m_from68k_ack(0),
m_from68k_st4(0),
m_from68k_st3(0),
m_from68k_st2(0)
{ }
/* kenseim */
DECLARE_WRITE16_MEMBER(cps1_kensei_w);
DECLARE_READ16_MEMBER(kensei_dsw_r);
DECLARE_DRIVER_INIT(kenseim);
// certain
@ -161,10 +168,12 @@ public:
DECLARE_READ8_MEMBER(portc_r); // 4 bit in - coins + start btns
// uncertain
DECLARE_WRITE8_MEMBER(portc_w); // 4 bit out
DECLARE_WRITE8_MEMBER(portd_w); // 4 bit out
DECLARE_READ8_MEMBER(portd_r); // 4 bit in
DECLARE_WRITE8_MEMBER(porte_w); // 8 bit out
DECLARE_WRITE8_MEMBER(portc_w); // 4 bit out (lamps, coinlock etc.?)
DECLARE_READ8_MEMBER(portd_r); // 4 bit in (comms flags from 68k)
DECLARE_WRITE8_MEMBER(portd_w); // 4 bit out (command flags to 68k?)
DECLARE_WRITE8_MEMBER(porte_w); // 8 bit out (command to 68k?)
WRITE8_MEMBER(i8255_porta_w); // maybe molesa output? (6-bits?)
WRITE8_MEMBER(i8255_portb_w); // maybe molesb output? (6-bits?)
@ -187,7 +196,17 @@ public:
//DECLARE_WRITE8_MEMBER(porta_default_w) { logerror("%s write %02x to port A but no handler assigned\n", machine().describe_context(), data); }
//DECLARE_WRITE8_MEMBER(portb_default_w) { logerror("%s write %02x to port B but no handler assigned\n", machine().describe_context(), data); }
int m_to_68k_cmd;
UINT8 m_to_68k_cmd_low;
UINT8 m_to_68k_cmd_d9;
UINT8 m_to_68k_cmd_req;
UINT8 m_to_68k_cmd_LVm;
int m_from68k_ack;
int m_from68k_st4;
int m_from68k_st3;
int m_from68k_st2;
DECLARE_CUSTOM_INPUT_MEMBER(kenseim_cmd_1234_r);
DECLARE_CUSTOM_INPUT_MEMBER(kenseim_cmd_5678_r);
DECLARE_CUSTOM_INPUT_MEMBER(kenseim_cmd_9_r);
@ -294,13 +313,14 @@ WRITE8_MEMBER(kenseim_state::portc_w)
WRITE8_MEMBER(kenseim_state::portd_w)
{
// port direction is set to 4-in 4-out
logerror("%s write %01x to port D (%02x unmasked)\n", machine().describe_context(), data & 0x0f, data) ;
printf("%s write %01x to port D (%02x unmasked) (to 68k command flags?)\n", machine().describe_context(), data & 0x0f, data) ;
}
WRITE8_MEMBER(kenseim_state::porte_w)
{
// only access is at 0ABE, surrounded by port D reads / writes
logerror("%s write %02x to port E\n", machine().describe_context(), data);
m_to_68k_cmd_low = data;
printf("%s write %02x to port E (to 68k command bits?)\n", machine().describe_context(), data);
}
READ8_MEMBER(kenseim_state::portd_r)
@ -308,13 +328,22 @@ READ8_MEMBER(kenseim_state::portd_r)
// port direction is set to 4-in 4-out
// int ret = rand() & 0xf0;
int ret = 0xf0;
int ret;
int in10 = m_from68k_ack; // loop at 0x929 - 0x92e waits for this to be 0
int in80 = m_from68k_st4; // loop at 0x931 - 0x936 then waits for this to be 1
int in20 = m_from68k_st3;
int in40 = m_from68k_st2;
ret = (in10 << 4) | (in20 << 5) | (in40 << 6) | (in80 << 7);
// comms port maybe? checks for 0x10 (bit 4,a) to be clear in a tight loop (092B) then for bit 0x80 to be set in another tight loop (0933) then at (0947) it checks that bits 0xe0 aren't set.
logerror("%s read port D\n", machine().describe_context());
logerror("%s read port D (returning %02x)\n", machine().describe_context(), ret);
return ret;
}
READ8_MEMBER(kenseim_state::portc_r)
{
// almost certain, check as 2 pairs, 0x09 and 0x06, the two 'coin' buttons and two 'start' buttons
@ -342,16 +371,23 @@ READ8_MEMBER(kenseim_state::portb_r)
WRITE16_MEMBER(kenseim_state::cps1_kensei_w)
{
if (mem_mask == 0xff00)
if (ACCESSING_BITS_8_15)
{
// coin_counter_w(machine(), 0, data & 0x0100);
// coin_counter_w(machine(), 1, data & 0x0200);
// coin_lockout_w(machine(), 0, ~data & 0x0400);
// coin_lockout_w(machine(), 1, ~data & 0x0800);
data >>= 8;;
// bit 15 = CPS-A custom reset?
logerror("%s cps1_kensei_w offs %04x (from 68k to DRIVE BOARD via CN2) (%02x) (%d ACK, %d ST4, %d ST3, %d ST2) \n", machine().describe_context(), offset * 2, data, (data & 0x01), ((data & 0x02)>>1),((data & 0x04)>>2),((data & 0x08)>>3) );
m_from68k_ack = (data & 0x0100) >> 8;
m_from68k_st4 = (data & 0x0200) >> 9;
m_from68k_st2 = (data & 0x0400) >> 10;
m_from68k_st3 = (data & 0x0800) >> 11;
logerror("%s cps1_kensei_w offs %04x (from 68k to DRIVE BOARD via CN2) (%02x) (%d ACK, %d ST4, %d ST2, %d ST3) \n", machine().describe_context(), offset * 2, data, m_from68k_ack, m_from68k_st4, m_from68k_st2, m_from68k_st3 );
if (data & 0xf0)
logerror(" ^^ (unknown? %02x)\n", data & 0xf0);
}
else
{
@ -498,39 +534,38 @@ static MACHINE_CONFIG_DERIVED_CLASS( kenseim, cps1_12MHz, kenseim_state )
MCFG_QUANTUM_PERFECT_CPU("maincpu")
MACHINE_CONFIG_END
/* how the DRIVE PCB connects to the inputs, see comments after each line
*/
CUSTOM_INPUT_MEMBER(kenseim_state::kenseim_cmd_1234_r)
{
// printf("kenseim_cmd_1234_r\n")
return (m_to_68k_cmd & 0x00f)>>0;
return (m_to_68k_cmd_low & 0x0f)>>0;
}
CUSTOM_INPUT_MEMBER(kenseim_state::kenseim_cmd_5678_r)
{
// printf("kenseim_cmd_5678_r\n")
m_to_68k_cmd++; // hack
return (m_to_68k_cmd & 0x0f0)>>4;
m_to_68k_cmd_low = rand();// hack;
return (m_to_68k_cmd_low & 0xf0)>>4;
}
CUSTOM_INPUT_MEMBER(kenseim_state::kenseim_cmd_9_r)
{
return (m_to_68k_cmd & 0x100) >> 8; // bit 9 of command?
return (m_to_68k_cmd_d9 & 0x1); // bit 9 of command?
}
CUSTOM_INPUT_MEMBER(kenseim_state::kenseim_cmd_req_r)
{
// hack
return rand();
m_to_68k_cmd_req = rand()&1; // hack
return m_to_68k_cmd_req;
}
CUSTOM_INPUT_MEMBER(kenseim_state::kenseim_cmd_LVm_r)
{
// needed for COMMAND WAIT message..
return 0;
return m_to_68k_cmd_LVm;
}