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|
// license:BSD-3-Clause
// copyright-holders:Vas Crabb
#include "emu.h"
#include "grapplerplus.h"
//#define VERBOSE 1
//#define LOG_OUTPUT_FUNC osd_printf_info
#include "logmacro.h"
namespace {
ROM_START(grapplerplus)
// TODO: add other revisions - 3.3 is known to exist
ROM_DEFAULT_BIOS("v32")
ROM_SYSTEM_BIOS(0, "v30", "ROM 3.0")
ROM_SYSTEM_BIOS(1, "v32", "ROM 3.2")
ROM_REGION(0x1000, "rom", 0)
ROMX_LOAD( "3.0.u9", 0x0000, 0x1000, CRC(17cf5e02) SHA1(9b01a9b1cf7752987e03f9b0285eb9329d63b777), ROM_BIOS(0) )
ROMX_LOAD( "3.2.u9", 0x0000, 0x1000, CRC(6f88b70c) SHA1(433ae61a0553ee9c1628ea5b6376dac848c04cad), ROM_BIOS(1) )
ROM_END
ROM_START(bufgrapplerplus)
// TODO: confirm contents
// despite having the same version string, this differs from the Grapper+ 3.2.u9 ROM
// 9433B-0141
// 90ROM00002
// GI8603CEY
// TAIWAN
ROM_REGION(0x1000, "rom", 0)
ROM_LOAD( "90rom00002.u18", 0x0000, 0x1000, CRC(cd07c7ef) SHA1(6c2f1375b5df6bb65dfca1444c064661242fef1a) )
// S 8450
// SCN8048A
// C6N40 B
// 95ROM08048
ROM_REGION(0x0400, "mcu", 0)
ROM_LOAD( "95rom08048.u10", 0x0000, 0x0400, CRC(55990f67) SHA1(f0907cf02d8c5dbf1bfacb0d626f2231142f0ff7) )
ROM_END
INPUT_PORTS_START(grapplerplus)
PORT_START("S1")
PORT_DIPNAME(0x07, 0x00, "Printer Type") PORT_DIPLOCATION("S1:4,3,2")
PORT_DIPSETTING( 0x00, "Epson Series")
PORT_DIPSETTING( 0x01, "NEC 8023/C. Itoh 8510/DMP 85")
PORT_DIPSETTING( 0x02, "Star Gemini")
PORT_DIPSETTING( 0x03, "Anadex Printers")
PORT_DIPSETTING( 0x04, "Okidata 82A, 83A, 92, 93, 84")
PORT_DIPSETTING( 0x06, "Okidata 84 w/o Step II Graphics")
PORT_DIPSETTING( 0x05, "Apple Dot Matrix")
PORT_DIPSETTING( 0x07, "invalid")
PORT_DIPNAME(0x08, 0x08, "Most Significant Bit") PORT_DIPLOCATION("S1:1") PORT_CHANGED_MEMBER(DEVICE_SELF, a2bus_grapplerplus_device_base, sw_msb, 0)
PORT_DIPSETTING( 0x08, "Software Control")
PORT_DIPSETTING( 0x00, "Not Transmitted")
INPUT_PORTS_END
INPUT_PORTS_START(bufgrapplerplus)
PORT_INCLUDE(grapplerplus)
PORT_START("CNF")
PORT_CONFNAME(0xff, 0x00, "RAM Size")
PORT_CONFSETTING( 0xfc, "16K (2 chips)")
PORT_CONFSETTING( 0xf0, "32K (4 chips)")
PORT_CONFSETTING( 0x00, "64K (8 chips)")
INPUT_PORTS_END
} // anonymous namespace
DEFINE_DEVICE_TYPE(A2BUS_GRAPPLERPLUS, a2bus_grapplerplus_device, "a2grapplerplus", "Orange Micro Grappler+ Printer Interface")
DEFINE_DEVICE_TYPE(A2BUS_BUFGRAPPLERPLUS, a2bus_buf_grapplerplus_device, "a2bufgrapplerplus", "Orange Micro Buffered Grappler+ Printer Interface")
DEFINE_DEVICE_TYPE(A2BUS_BUFGRAPPLERPLUSA, a2bus_buf_grapplerplus_reva_device, "a2bufgrapplerplusa", "Orange Micro Buffered Grappler+ (rev A) Printer Interface")
//==============================================================
// Grappler+ base
//==============================================================
a2bus_grapplerplus_device_base::a2bus_grapplerplus_device_base(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock) :
device_t(mconfig, type, tag, owner, clock),
device_a2bus_card_interface(mconfig, *this),
m_printer_conn(*this, "prn"),
m_printer_out(*this, "prn_out"),
m_s1(*this, "S1"),
m_rom(*this, "rom"),
m_rom_bank(0x0000U),
m_ack_latch(1U),
m_ack_in(1U),
m_busy_in(1U),
m_pe_in(1U),
m_slct_in(1U)
{
}
//--------------------------------------------------
// device_t implementation
//--------------------------------------------------
void a2bus_grapplerplus_device_base::device_add_mconfig(machine_config &config)
{
CENTRONICS(config, m_printer_conn, centronics_devices, "printer");
m_printer_conn->busy_handler().set(FUNC(a2bus_grapplerplus_device_base::busy_w));
m_printer_conn->perror_handler().set(FUNC(a2bus_grapplerplus_device_base::pe_w));
m_printer_conn->select_handler().set(FUNC(a2bus_grapplerplus_device_base::slct_w));
OUTPUT_LATCH(config, m_printer_out);
m_printer_conn->set_output_latch(*m_printer_out);
}
ioport_constructor a2bus_grapplerplus_device_base::device_input_ports() const
{
return INPUT_PORTS_NAME(grapplerplus);
}
void a2bus_grapplerplus_device_base::device_start()
{
save_item(NAME(m_rom_bank));
save_item(NAME(m_ack_latch));
save_item(NAME(m_ack_in));
save_item(NAME(m_busy_in));
save_item(NAME(m_pe_in));
save_item(NAME(m_slct_in));
}
void a2bus_grapplerplus_device_base::device_reset()
{
m_ack_latch = 1U;
}
//--------------------------------------------------
// device_a2bus_card_interface implementation
//--------------------------------------------------
void a2bus_grapplerplus_device_base::write_c0nx(u8 offset, u8 data)
{
LOG("Write C0n%01X=%02X\n", offset, data);
if (!(offset & 0x03U)) // !A0 && !A1 - write data
{
// latch output data
LOG("Latch data %02X\n", data);
data_latched(data);
// clearing the ACK latch will acknowledge an interrupt
if (m_ack_in)
{
if (m_ack_latch)
LOG("Clearing acknowledge latch\n");
else
LOG("Previous data not acknowledged\n");
m_ack_latch = 0U;
ack_latch_cleared();
}
else
{
LOG("/ACK asserted, not clearing acknowledge latch\n");
}
}
if (BIT(offset, 0)) // A0 - select high ROM bank
{
if (!m_rom_bank)
LOG("Select high ROM bank\n");
else
LOG("High ROM bank already selected\n");
m_rom_bank = 0x0800U;
}
}
u8 a2bus_grapplerplus_device_base::read_cnxx(u8 offset)
{
if (!machine().side_effects_disabled())
{
if (m_rom_bank)
LOG("Select low ROM bank\n");
m_rom_bank = 0x0000U;
}
return m_rom[(!m_ack_latch && BIT(offset, 7)) ? (offset & 0xbfU) : offset];
}
void a2bus_grapplerplus_device_base::write_cnxx(u8 offset, u8 data)
{
LOG("Write Cn%02X=%02X (bus conflict)\n", offset, data);
if (m_rom_bank)
LOG("Select low ROM bank\n");
m_rom_bank = 0x0000U;
}
u8 a2bus_grapplerplus_device_base::read_c800(u16 offset)
{
return m_rom[(offset & 0x07ffU) | m_rom_bank];
}
//--------------------------------------------------
// printer status inputs
//--------------------------------------------------
WRITE_LINE_MEMBER(a2bus_grapplerplus_device_base::ack_w)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(a2bus_grapplerplus_device_base::set_ack_in), this), state ? 1 : 0);
}
WRITE_LINE_MEMBER(a2bus_grapplerplus_device_base::busy_w)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(a2bus_grapplerplus_device_base::set_busy_in), this), state ? 1 : 0);
}
WRITE_LINE_MEMBER(a2bus_grapplerplus_device_base::pe_w)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(a2bus_grapplerplus_device_base::set_pe_in), this), state ? 1 : 0);
}
WRITE_LINE_MEMBER(a2bus_grapplerplus_device_base::slct_w)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(a2bus_grapplerplus_device_base::set_slct_in), this), state ? 1 : 0);
}
//--------------------------------------------------
// synchronised printer status inputs
//--------------------------------------------------
void a2bus_grapplerplus_device_base::set_ack_in(void *ptr, s32 param)
{
if (u32(param) != m_ack_in)
{
LOG("/ACK=%d\n", param);
m_ack_in = u8(u32(param));
if (!param)
{
if (!m_ack_latch)
LOG("Set acknowledge latch\n");
else
LOG("No data written since previous acknowledge\n");
m_ack_latch = 1U;
ack_latch_set();
}
}
}
void a2bus_grapplerplus_device_base::set_busy_in(void *ptr, s32 param)
{
if (u32(param) != m_busy_in)
{
LOG("BUSY=%d\n", param);
m_busy_in = u8(u32(param));
}
}
void a2bus_grapplerplus_device_base::set_pe_in(void *ptr, s32 param)
{
if (u32(param) != m_pe_in)
{
LOG("PAPER EMPTY=%d\n", param);
m_pe_in = u8(u32(param));
}
}
void a2bus_grapplerplus_device_base::set_slct_in(void *ptr, s32 param)
{
if (u32(param) != m_slct_in)
{
LOG("SELECT=%d\n", param);
m_slct_in = u8(u32(param));
}
}
//==============================================================
// Grappler+ implementation
//==============================================================
a2bus_grapplerplus_device::a2bus_grapplerplus_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock) :
a2bus_grapplerplus_device_base(mconfig, A2BUS_GRAPPLERPLUS, tag, owner, clock),
m_strobe_timer(nullptr),
m_data_latch(0xffU),
m_irq_disable(1U),
m_irq(0x00U),
m_next_strobe(1U)
{
}
//--------------------------------------------------
// DIP switch handlers
//--------------------------------------------------
INPUT_CHANGED_MEMBER(a2bus_grapplerplus_device::sw_msb)
{
if (BIT(m_data_latch, 7))
m_printer_out->write(m_data_latch & (BIT(m_s1->read(), 3) ? 0xffU : 0x7fU));
}
//--------------------------------------------------
// device_a2bus_card_interface implementation
//--------------------------------------------------
u8 a2bus_grapplerplus_device::read_c0nx(u8 offset)
{
return
m_irq |
((m_s1->read() & 0x07U) << 4) |
(busy_in() << 3) |
(pe_in() << 2) |
(slct_in() << 1) |
ack_latch();
}
void a2bus_grapplerplus_device::write_c0nx(u8 offset, u8 data)
{
a2bus_grapplerplus_device_base::write_c0nx(offset, data);
if (BIT(offset, 1)) // A1 - disable interrupt
{
if (!m_irq_disable)
LOG("Disable interrupt request\n");
else
LOG("Interrupt request already disabled\n");
m_irq_disable = 1U;
if (m_irq)
{
assert(ack_latch());
LOG("Releasing slot IRQ\n");
m_irq = 0x00U;
lower_slot_irq();
}
}
else if (BIT(offset, 2)) // A2 - enable interrupt
{
if (m_irq_disable)
LOG("Enable interrupt request\n");
else
LOG("Interrupt request already enabled\n");
m_irq_disable = 0U;
if (ack_latch() && !m_irq)
{
LOG("Asserting slot IRQ\n");
m_irq = 0x80U;
raise_slot_irq();
}
}
}
//--------------------------------------------------
// device_t implementation
//--------------------------------------------------
tiny_rom_entry const *a2bus_grapplerplus_device::device_rom_region() const
{
return ROM_NAME(grapplerplus);
}
void a2bus_grapplerplus_device::device_add_mconfig(machine_config &config)
{
a2bus_grapplerplus_device_base::device_add_mconfig(config);
m_printer_conn->ack_handler().set(FUNC(a2bus_grapplerplus_device::ack_w));
}
void a2bus_grapplerplus_device::device_start()
{
a2bus_grapplerplus_device_base::device_start();
m_strobe_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(a2bus_grapplerplus_device::update_strobe), this));
m_next_strobe = 1U;
save_item(NAME(m_data_latch));
save_item(NAME(m_irq_disable));
save_item(NAME(m_irq));
save_item(NAME(m_next_strobe));
m_strobe_timer->adjust(attotime::from_ticks(7, clock()));
}
void a2bus_grapplerplus_device::device_reset()
{
a2bus_grapplerplus_device_base::device_reset();
m_irq_disable = 1U;
if (m_irq)
{
m_irq = 0x00U;
lower_slot_irq();
}
}
//--------------------------------------------------
// a2bus_grapplerplus_device_base implementation
//--------------------------------------------------
void a2bus_grapplerplus_device::data_latched(u8 data)
{
// remember MSB can be forced low by DIP switch
m_data_latch = data;
m_printer_out->write(m_data_latch & (BIT(m_s1->read(), 3) ? 0xffU : 0x7fU));
// generate strobe pulse after one clock cycle
m_next_strobe = 0U;
if (!m_strobe_timer->enabled())
{
LOG("Start strobe timer\n");
m_strobe_timer->adjust(attotime::from_ticks(7, clock()));
}
}
void a2bus_grapplerplus_device::ack_latch_set()
{
if (!m_irq_disable && !m_irq)
{
LOG("Asserting slot IRQ\n");
m_irq = 0x80U;
raise_slot_irq();
}
}
void a2bus_grapplerplus_device::ack_latch_cleared()
{
if (m_irq)
{
assert(!m_irq_disable);
LOG("Releasing slot IRQ\n");
m_irq = 0x00U;
lower_slot_irq();
}
}
//--------------------------------------------------
// timer handlers
//--------------------------------------------------
TIMER_CALLBACK_MEMBER(a2bus_grapplerplus_device::update_strobe)
{
LOG("Output /STROBE=%u\n", m_next_strobe);
m_printer_conn->write_strobe(m_next_strobe);
if (!m_next_strobe)
{
LOG("Start strobe timer\n");
m_next_strobe = 1U;
m_strobe_timer->adjust(attotime::from_ticks(7, clock()));
}
}
//==============================================================
// Buffered Grappler+ implementation
//==============================================================
a2bus_buf_grapplerplus_device::a2bus_buf_grapplerplus_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock) :
a2bus_buf_grapplerplus_device(mconfig, A2BUS_BUFGRAPPLERPLUS, tag, owner, clock)
{
}
a2bus_buf_grapplerplus_device::a2bus_buf_grapplerplus_device(machine_config const &mconfig, device_type type, char const *tag, device_t *owner, u32 clock) :
a2bus_grapplerplus_device_base(mconfig, type, tag, owner, clock),
m_mcu(*this, "mcu"),
m_ram(),
m_ram_row(0xff00),
m_ram_mask(0x00U),
m_mcu_p2(0xffU),
m_data_latch(0xffU),
m_ibusy(1U),
m_buf_ack_latch(1U),
m_buf_ack_in(1U)
{
}
//--------------------------------------------------
// device_a2bus_card_interface implementation
//--------------------------------------------------
u8 a2bus_buf_grapplerplus_device::read_c0nx(u8 offset)
{
return
((m_s1->read() & 0x0fU) << 4) |
(m_ibusy << 3) |
(pe_in() << 2) |
(slct_in() << 1) |
ack_latch();
}
//--------------------------------------------------
// device_t implementation
//--------------------------------------------------
tiny_rom_entry const *a2bus_buf_grapplerplus_device::device_rom_region() const
{
return ROM_NAME(bufgrapplerplus);
}
void a2bus_buf_grapplerplus_device::device_add_mconfig(machine_config &config)
{
// 1982 schematics show MCU driven by 7M clock
device_add_mconfig(config, DERIVED_CLOCK(1, 1));
}
ioport_constructor a2bus_buf_grapplerplus_device::device_input_ports() const
{
return INPUT_PORTS_NAME(bufgrapplerplus);
}
void a2bus_buf_grapplerplus_device::device_start()
{
a2bus_grapplerplus_device_base::device_start();
m_ram = std::make_unique<u8 []>(0x10000);
save_pointer(NAME(m_ram), 0x10000);
save_item(NAME(m_ram_row));
save_item(NAME(m_ram_mask));
save_item(NAME(m_mcu_p2));
save_item(NAME(m_data_latch));
save_item(NAME(m_ibusy));
save_item(NAME(m_buf_ack_latch));
save_item(NAME(m_buf_ack_in));
}
void a2bus_buf_grapplerplus_device::device_reset()
{
// The MCU is not reset when /RST is asserted. Instead, /RST is
// connected to P27. Pressing the reset key(s) momentarily will not
// clear the print buffer - the host Apple II can be reset without
// interrupting a long print job. Holding the reset key(s) for two
// seconds clears the buffer. Holding the reset key(s) on initial
// boot enters the RAM test (results are printed). MAME doesn't
// currently cater for devices that don't reset their children on
// reset, and Apple II slots don't currently expose the /RST signal
// directly.
a2bus_grapplerplus_device_base::device_reset();
// should only do this on initial reset, but we get away with it here because the MCU is automatically reset even if it shouldn't be
m_ram_mask = ioport("CNF")->read();
}
//--------------------------------------------------
// helpers
//--------------------------------------------------
template <typename T>
void a2bus_buf_grapplerplus_device::device_add_mconfig(machine_config &config, T &&mcu_clock)
{
a2bus_grapplerplus_device_base::device_add_mconfig(config);
m_printer_conn->ack_handler().set(FUNC(a2bus_buf_grapplerplus_device::buf_ack_w));
// P22 is tied high, pulling it low is used for some factory test mode
I8048(config, m_mcu, std::forward<T>(mcu_clock));
m_mcu->set_addrmap(AS_IO, &a2bus_buf_grapplerplus_device::mcu_io);
m_mcu->p2_out_cb().set(FUNC(a2bus_buf_grapplerplus_device::mcu_p2_w));
m_mcu->t0_in_cb().set([this] () { return busy_in(); });
m_mcu->t1_in_cb().set([this] () { return m_buf_ack_latch; });
m_mcu->bus_in_cb().set(FUNC(a2bus_buf_grapplerplus_device::mcu_bus_r));
m_mcu->bus_out_cb().set(FUNC(a2bus_buf_grapplerplus_device::mcu_bus_w));
}
//--------------------------------------------------
// a2bus_grapplerplus_device_base implementation
//--------------------------------------------------
void a2bus_buf_grapplerplus_device::data_latched(u8 data)
{
// IBUSY is exposed on C0nX
if (!m_ibusy)
LOG("Setting IBUSY\n");
else
LOG("IBUSY already set\n");
m_ibusy = 1U;
// these signals cross executable device domains
machine().scheduler().synchronize(timer_expired_delegate(FUNC(a2bus_buf_grapplerplus_device::set_buf_data), this), int(unsigned(data)));
m_mcu->set_input_line(MCS48_INPUT_IRQ, ASSERT_LINE);
}
//--------------------------------------------------
// printer status inputs
//--------------------------------------------------
DECLARE_WRITE_LINE_MEMBER(a2bus_buf_grapplerplus_device::buf_ack_w)
{
machine().scheduler().synchronize(timer_expired_delegate(FUNC(a2bus_buf_grapplerplus_device::set_buf_ack_in), this), state ? 1 : 0);
}
//--------------------------------------------------
// MCU I/O handlers
//--------------------------------------------------
void a2bus_buf_grapplerplus_device::mcu_io(address_map &map)
{
map(0x00, 0xff).nopr(); // read to put the BUS lines in high-impedance state before a real read using INS
}
void a2bus_buf_grapplerplus_device::mcu_p2_w(u8 data)
{
// check for changed bits
u8 const diff(data ^ m_mcu_p2);
m_mcu_p2 = data;
// P20 enables /CAS on /RD or /WR
if (BIT(diff, 0))
LOG("RAM EN=%u\n", BIT(data, 0));
// row address strobe
if (BIT(diff, 1))
{
if (!BIT(data, 1))
{
LOG("Row address %02X\n", m_mcu->p1_r());
m_ram_row = u16(m_mcu->p1_r()) << 8;
}
else
{
LOG("Released /RAS\n");
}
}
// P23 is the /IOEN signal
if (BIT(diff, 3))
LOG("/IOEN=%u\n", BIT(data, 3));
// P24 allows fast DRAM refresh using ALE for /RAS
if (BIT(diff, 4))
LOG(BIT(data, 4) ? "Start DRAM refresh\n" : "End DRAM refresh\n");
// P25 is the strobe output and clears the acknowledge latch
if (BIT(diff, 5))
{
if (BIT(data, 5))
{
if (m_buf_ack_in)
{
if (m_buf_ack_latch)
LOG("T1 already set\n");
else
LOG("Setting T1\n");
m_buf_ack_latch = 1U;
}
else
{
LOG("/ACK asserted, not setting T1\n");
}
}
LOG("Output /STROBE=%u\n", BIT(data, 5));
m_printer_conn->write_strobe(BIT(data, 5));
}
}
u8 a2bus_buf_grapplerplus_device::mcu_bus_r()
{
u8 result(0xffU);
// RAM EN enables RAM
if (BIT(m_mcu_p2, 0))
{
if (!BIT(m_mcu_p2, 1))
{
u16 const addr(m_ram_row | u16(m_mcu->p1_r()));
LOG("Read RAM @%04X=%02X\n", addr, m_ram[addr]);
result &= m_ram[addr] | m_ram_mask;
}
else
{
LOG("/RD asserted /CAS while /RAS not asserted\n");
}
}
// /IOEN enables the data latch, pulses /IACK and clears IBUSY on /RD
if (!BIT(m_mcu_p2, 3))
{
LOG("Read data latch %02X\n", m_data_latch);
result &= m_data_latch;
machine().scheduler().synchronize(timer_expired_delegate(FUNC(a2bus_buf_grapplerplus_device::clear_ibusy), this));
m_mcu->set_input_line(MCS48_INPUT_IRQ, CLEAR_LINE);
ack_w(0);
ack_w(1);
}
return result;
}
void a2bus_buf_grapplerplus_device::mcu_bus_w(u8 data)
{
// RAM EN enables RAM
if (BIT(m_mcu_p2, 0))
{
if (!BIT(m_mcu_p2, 1))
{
u16 const addr(m_ram_row | u16(m_mcu->p1_r()));
LOG("Wrote RAM @%04X=%02X\n", addr, data);
m_ram[addr] = data | m_ram_mask;
}
else
{
LOG("/WR asserted /CAS while /RAS not asserted\n");
}
}
// /IOEN enables output latch
if (!BIT(m_mcu_p2, 3))
{
LOG("Output data %02X\n", data);
m_printer_out->write(data);
}
}
//--------------------------------------------------
// synchronised signals
//--------------------------------------------------
void a2bus_buf_grapplerplus_device::set_buf_data(void *ptr, s32 param)
{
m_data_latch = u8(u32(param));
}
void a2bus_buf_grapplerplus_device::set_buf_ack_in(void *ptr, s32 param)
{
if (u32(param) != m_buf_ack_in)
{
LOG("/ACK=%d\n", param);
m_buf_ack_in = u8(u32(param));
if (!param)
{
if (m_buf_ack_latch)
LOG("Clearing T1\n");
else
LOG("No data output since previous acknowledge\n");
m_buf_ack_latch = 0U;
}
}
}
void a2bus_buf_grapplerplus_device::clear_ibusy(void *ptr, s32 param)
{
if (m_ibusy)
{
LOG("Clearing IBUSY\n");
m_ibusy = 0U;
}
else
{
LOG("IBUSY already clear\n");
}
}
//==============================================================
// Buffered Grappler+ rev A implementation
//==============================================================
a2bus_buf_grapplerplus_reva_device::a2bus_buf_grapplerplus_reva_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock) :
a2bus_buf_grapplerplus_device(mconfig, A2BUS_BUFGRAPPLERPLUSA, tag, owner, clock)
{
}
//--------------------------------------------------
// device_t implementation
//--------------------------------------------------
void a2bus_buf_grapplerplus_reva_device::device_add_mconfig(machine_config &config)
{
// boards with 6 MHz clock crystal for MCU have been seen with both UVEPROM and mask ROM parts
// ORANGE MICRO INC., 1983
// ASSY NO, 72 BGP 00001 REV A
// PART NO. 95PCB00003
a2bus_buf_grapplerplus_device::device_add_mconfig(config, 6_MHz_XTAL);
}
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