// license:BSD-3-Clause
// copyright-holders:Ariane Fugmann
/*
Comm PCB
--------
MODEL-1 COMMUNICATION BD 837-8842 171-6293B (C) SEGA 1992
|--------------------------------------------------------------------------------|
| |
| MB89237A MB89374 |
| JP4 LED1 |
| 15112.17 Z80 |
| JP2 JP3 75179 |
| MB8464 315-5624 JP6 |
| 315-5547 |
| 315-5611 SW1 PC910 CN4|
| |
| PC910 CN5|
| MB8421 MB8431 JP7 |
| JP5 |
| JP8 CN7|
| CN1 CN2 |
| |---------------------------------| |---------------------------------| CN6|
| |---------------------------------| |---------------------------------| |
|--------------------------------------------------------------------------------|
Notes:
15112.17 - AMD AM27C100 128k x8 EPROM (DIP32, labelled 'EPR-15112')
Z80 - Zilog Z0840008PSC Z80 CPU, running at 8.000MHz (DIP40)
MB8464 - Fujitsu MB8464 8k x8 SRAM (DIP28)
MB8421 - Fujitsu MB8421-12LP 2k x8 SRAM (SDIP52)
MB8431 - Fujitsu MB8431-90LP 2k x8 SRAM (SDIP52)
MB89237A - Fujitsu MB89237A DMA-Controller (DIP20) [most likely i8237A clone]
MB89374 - Fujitsu MB89374 Data Link Controller (SDIP42)
75179 - Texas Instruments SN75179 Differential Driver and Receiver Pair (DIP8)
315-5547 - AMI 18CV8PC-25 PAL (DIP20)
315-5624 - MMI PAL16L8BCN PAL (DIP20)
315-5611 - Lattice GAL16V8A PAL (DIP20)
PC910 - Sharp PC910 opto-isolator (x2, DIP8)
SW1 - Push Button Switch (enables board)
CN1, CN2 - Connectors to join Comm board to Video board
CN4 - 8 pin connector (DIFFERENTIAL port)
CN5 - 6 pin connector (SERIAL port)
CN6, CN7 - TOSLINK-Connectors for network optical cable link
JP2 - Jumper, set to 2-3 (connected to EPROM A15)
JP3 - Jumper, set to 1-2 (connected to EPROM A16)
JP4 - Jumper, set to 1-2
JP5 - Jumper, shorted (enables TOSLINK RX channel)
JP6 - Jumper, not shorted (enables DIFFERERENTIAL RX channel)
JP7 - Jumper, not shorted (enables SERIAL RX channel)
JP8 - Jumper, set to 1-2 (selects CLOCK SOURCE)
*/
#include "emu.h"
#include "emuopts.h"
#include "machine/m1comm.h"
#define Z80_TAG "m1commcpu"
//#define __M1COMM_VERBOSE__
/*************************************
* M1COMM Memory Map
*************************************/
static ADDRESS_MAP_START( m1comm_mem, AS_PROGRAM, 8, m1comm_device )
AM_RANGE(0x0000, 0x7fff) AM_ROM
AM_RANGE(0x8000, 0x9fff) AM_RAM
AM_RANGE(0xC000, 0xffff) AM_READWRITE(share_r, share_w)
ADDRESS_MAP_END
/*************************************
* M1COMM I/O Map
*************************************/
static ADDRESS_MAP_START( m1comm_io, AS_IO, 8, m1comm_device )
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x1F) AM_READWRITE(dlc_reg_r, dlc_reg_w)
AM_RANGE(0x20, 0x2F) AM_READWRITE(dma_reg_r, dma_reg_w)
AM_RANGE(0x40, 0x40) AM_READWRITE(syn_r, syn_w)
AM_RANGE(0x60, 0x60) AM_READWRITE(zfg_r, zfg_w)
AM_RANGE(0xFF, 0xFF) AM_RAM
ADDRESS_MAP_END
MACHINE_CONFIG_FRAGMENT( m1comm )
MCFG_CPU_ADD(Z80_TAG, Z80, 8000000) /* 32 MHz / 4 */
MCFG_CPU_PROGRAM_MAP(m1comm_mem)
MCFG_CPU_IO_MAP(m1comm_io)
MACHINE_CONFIG_END
ROM_START( m1comm )
ROM_REGION( 0x20000, Z80_TAG, ROMREGION_ERASEFF )
ROM_LOAD( "epr-15112.17", 0x0000, 0x20000, CRC(4950e771) SHA1(99014124e0324dd114cb22f55159d18b597a155a) )
ROM_END
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
const device_type M1COMM = &device_creator<m1comm_device>;
//-------------------------------------------------
// machine_config_additions - device-specific
// machine configurations
//-------------------------------------------------
machine_config_constructor m1comm_device::device_mconfig_additions() const
{
return MACHINE_CONFIG_NAME( m1comm );
}
//-------------------------------------------------
// rom_region - device-specific ROM region
//-------------------------------------------------
const tiny_rom_entry *m1comm_device::device_rom_region() const
{
return ROM_NAME( m1comm );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// m1comm_device - constructor
//-------------------------------------------------
m1comm_device::m1comm_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, M1COMM, "MODEL-1 COMMUNICATION BD", tag, owner, clock, "m1comm", __FILE__),
m_commcpu(*this, Z80_TAG),
m_line_rx(OPEN_FLAG_WRITE | OPEN_FLAG_CREATE ),
m_line_tx(OPEN_FLAG_READ)
{
// prepare localhost "filename"
m_localhost[0] = 0;
strcat(m_localhost, "socket.");
strcat(m_localhost, mconfig.options().comm_localhost());
strcat(m_localhost, ":");
strcat(m_localhost, mconfig.options().comm_localport());
// prepare remotehost "filename"
m_remotehost[0] = 0;
strcat(m_remotehost, "socket.");
strcat(m_remotehost, mconfig.options().comm_remotehost());
strcat(m_remotehost, ":");
strcat(m_remotehost, mconfig.options().comm_remoteport());
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void m1comm_device::device_start()
{
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void m1comm_device::device_reset()
{
m_syn = 0;
m_zfg = 0;
m_cn = 0;
m_fg = 0;
m_commcpu->set_input_line(INPUT_LINE_RESET, ASSERT_LINE);
}
READ8_MEMBER(m1comm_device::dlc_reg_r)
{
// dirty hack to keep Z80 in RESET state
if (!m_cn)
{
device_reset();
return 0xFF;
}
// dirty hack to keep Z80 in RESET state
uint8_t result = m_dlc_reg[offset];
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-dlc_reg_r: read register %02x for value %02x\n", offset, result);
#endif
return result;
}
WRITE8_MEMBER(m1comm_device::dlc_reg_w)
{
m_dlc_reg[offset] = data;
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-dlc_reg_w: write register %02x for value %02x\n", offset, data);
#endif
}
READ8_MEMBER(m1comm_device::dma_reg_r)
{
uint8_t result = m_dma_reg[offset];
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-dma_reg_r: read register %02x for value %02x\n", offset, result);
#endif
return result;
}
WRITE8_MEMBER(m1comm_device::dma_reg_w)
{
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-dma_reg_w: %02x %02x\n", offset, data);
#endif
m_dma_reg[offset] = data;
}
READ8_MEMBER(m1comm_device::syn_r)
{
uint8_t result = m_syn | 0xFC;
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-syn_r: read register %02x for value %02x\n", offset, result);
#endif
return result;
}
WRITE8_MEMBER(m1comm_device::syn_w)
{
m_syn = data & 0x03;
#ifdef __M1COMM_VERBOSE__
switch (data & 0x02)
{
case 0x00:
osd_printf_verbose("m1comm-syn_w: VINT disabled\n");
break;
case 0x02:
osd_printf_verbose("m1comm-syn_w: VINT enabled\n");
break;
default:
osd_printf_verbose("m1comm-syn_w: %02x\n", data);
break;
}
#endif
}
READ8_MEMBER(m1comm_device::zfg_r)
{
uint8_t result = m_zfg | (~m_fg << 7) | 0x7e;
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-zfg_r: read register %02x for value %02x\n", offset, result);
#endif
return result;
}
WRITE8_MEMBER(m1comm_device::zfg_w)
{
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-zfg_w: %02x\n", data);
#endif
m_zfg = data & 0x01;
}
READ8_MEMBER(m1comm_device::share_r)
{
return m_shared[offset];
}
WRITE8_MEMBER(m1comm_device::share_w)
{
m_shared[offset] = data;
}
READ8_MEMBER(m1comm_device::cn_r)
{
return m_cn | 0xfe;
}
WRITE8_MEMBER(m1comm_device::cn_w)
{
m_cn = data & 0x01;
#ifndef __M1COMM_SIMULATION__
if (!m_cn)
device_reset();
else
m_commcpu->set_input_line(INPUT_LINE_RESET, CLEAR_LINE);
#else
if (!m_cn)
{
// reset command
osd_printf_verbose("M1COMM: board disabled\n");
m_linkenable = 0x00;
m_zfg = 0x00;
}
else
{
// init command
osd_printf_verbose("M1COMM: board enabled\n");
m_linkenable = 0x01;
m_linkid = 0x00;
m_linkalive = 0x00;
m_linkcount = 0x00;
m_linktimer = 0x00e8; // 58 fps * 4s
}
#endif
}
READ8_MEMBER(m1comm_device::fg_r)
{
return m_fg | (~m_zfg << 7) | 0x7e;
}
WRITE8_MEMBER(m1comm_device::fg_w)
{
if (!m_cn)
return;
m_fg = data & 0x01;
}
void m1comm_device::check_vint_irq()
{
#ifndef __M1COMM_SIMULATION__
if (m_syn & 0x02)
{
m_commcpu->set_input_line_and_vector(0, HOLD_LINE, 0xef);
#ifdef __M1COMM_VERBOSE__
osd_printf_verbose("m1comm-INT5\n");
#endif
}
#else
comm_tick();
#endif
}
#ifdef __M1COMM_SIMULATION__
void m1comm_device::comm_tick()
{
if (m_linkenable == 0x01)
{
int frameStart = 0x0010;
int frameOffset = 0x0000;
int frameSize = 0x01c4;
int dataSize = frameSize + 1;
int togo = 0;
int recv = 0;
int idx = 0;
bool isMaster = (m_shared[1] == 0x01);
bool isSlave = (m_shared[1] == 0x02);
bool isRelay = (m_shared[1] == 0x00);
// if link not yet established...
if (m_linkalive == 0x00)
{
// waiting...
m_shared[0] = 0x05;
// check rx socket
if (!m_line_rx.is_open())
{
osd_printf_verbose("M1COMM: listen on %s\n", m_localhost);
m_line_rx.open(m_localhost);
}
// check tx socket
if (!m_line_tx.is_open())
{
osd_printf_verbose("M1COMM: connect to %s\n", m_remotehost);
m_line_tx.open(m_remotehost);
}
// if both sockets are there check ring
if ((m_line_rx.is_open()) && (m_line_tx.is_open()))
{
// try to read one messages
recv = m_line_rx.read(m_buffer, dataSize);
while (recv != 0)
{
// check if complete message
if (recv == dataSize)
{
// check if message id
idx = m_buffer[0];
// 0xFF - link id
if (idx == 0xff)
{
if (isMaster)
{
// master gets first id and starts next state
m_linkid = 0x01;
m_linkcount = m_buffer[1];
m_linktimer = 0x01;
}
else if (isSlave || isRelay)
{
// slave gets own id
if (isSlave)
{
m_buffer[1]++;
m_linkid = m_buffer[1];
}
// slave and relay forward message
m_line_tx.write(m_buffer, dataSize);
}
}
// 0xFE - link size
else if (idx == 0xfe)
{
if (isSlave || isRelay)
{
m_linkcount = m_buffer[1];
// slave and relay forward message
m_line_tx.write(m_buffer, dataSize);
}
// consider it done
osd_printf_verbose("M1COMM: link established - id %02x of %02x\n", m_linkid, m_linkcount);
m_linkalive = 0x01;
m_zfg = 0x01;
// write to shared mem
m_shared[0] = 0x01;
m_shared[2] = m_linkid;
m_shared[3] = m_linkcount;
}
}
else
{
// got only part of a message - read the rest (and drop it)
// TODO: combine parts and push to "ring buffer"
togo = dataSize - recv;
while (togo > 0){
recv = m_line_rx.read(m_buffer, togo);
togo -= recv;
}
osd_printf_verbose("M1COMM: dropped a message...\n");
}
if (m_linkalive == 0x00)
recv = m_line_rx.read(m_buffer, dataSize);
else
recv = 0;
}
// if we are master and link is not yet established
if (isMaster && (m_linkalive == 0x00))
{
// send first packet
if (m_linktimer == 0x00)
{
m_buffer[0] = 0xff;
m_buffer[1] = 0x01;
m_line_tx.write(m_buffer, dataSize);
}
// send second packet
else if (m_linktimer == 0x01)
{
m_buffer[0] = 0xfe;
m_buffer[1] = m_linkcount;
m_line_tx.write(m_buffer, dataSize);
// consider it done
osd_printf_verbose("M1COMM: link established - id %02x of %02x\n", m_linkid, m_linkcount);
m_linkalive = 0x01;
m_zfg = 0x01;
// write to shared mem
m_shared[0] = 0x01;
m_shared[2] = m_linkid;
m_shared[3] = m_linkcount;
}
else if (m_linktimer > 0x02)
{
// decrease delay timer
m_linktimer--;
if (m_linktimer == 0x02)
m_linktimer = 0x00;
}
}
}
}
// update "ring buffer" if link established
if (m_linkalive == 0x01)
{
int togo = 0;
// try to read one messages
int recv = m_line_rx.read(m_buffer, dataSize);
while (recv != 0)
{
// check if complete message
if (recv == dataSize)
{
// check if valid id
int idx = m_buffer[0];
if (idx > 0 && idx <= m_linkcount) {
// if not our own message
if (idx != m_linkid)
{
// save message to "ring buffer"
frameOffset = frameStart + (idx * frameSize);
for (int j = 0x00 ; j < frameSize ; j++)
{
m_shared[frameOffset + j] = m_buffer[1 + j];
}
// forward message to other nodes
m_line_tx.write(m_buffer, dataSize);
}
} else {
if (!isMaster && idx == 0xf0){
// 0xF0 - master addional bytes
for (int j = 0x06 ; j < 0x10 ; j++)
{
m_shared[j] = m_buffer[1 + j];
}
// forward message to other nodes
m_line_tx.write(m_buffer, dataSize);
}
}
}
else
{
// got only part of a message - read the rest (and drop it)
// TODO: combine parts and push to "ring buffer"
togo = dataSize - recv;
while (togo > 0){
recv = m_line_rx.read(m_buffer, togo);
togo -= recv;
}
osd_printf_verbose("M1COMM: dropped a message...\n");
}
recv = m_line_rx.read(m_buffer, dataSize);
}
// update "ring buffer" if link established
// live relay does not send data
if (m_linkid != 0x00 && m_shared[5] != 0x00)
{
m_buffer[0] = m_linkid;
frameOffset = frameStart + (m_linkid * frameSize);
for (int j = 0x00 ; j < frameSize ; j++)
{
// push message to "ring buffer"
m_shared[frameOffset + j] = m_shared[frameStart + j];
m_buffer[1 + j] = m_shared[frameStart + j];
}
// push message to other nodes
m_line_tx.write(m_buffer, dataSize);
// master sends some additional status bytes
if (isMaster){
m_buffer[0] = 0xf0;
for (int j = 0x00 ; j < frameSize ; j++)
{
m_buffer[1 + j] = 0x00;
}
for (int j = 0x06 ; j < 0x10 ; j++)
{
m_buffer[1 + j] = m_shared[j];
}
// push message to other nodes
m_line_tx.write(m_buffer, dataSize);
}
}
// clear 05
m_shared[5] = 0x00;
}
}
}
#endif