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isa/np600: Guess functions of various things

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This commit is contained in:
AJR 2023-02-16 21:59:25 -05:00
parent de3eec85ef
commit 20d7135179
2 changed files with 28 additions and 6 deletions
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31
src/devices/bus/isa/np600.cpp
View file

@ -20,6 +20,7 @@ np600a3_device::np600a3_device(const machine_config &mconfig, const char *tag, d
, device_isa16_card_interface(mconfig, *this)
, m_npcpu(*this, "npcpu")
, m_lcc(*this, "lcc")
, m_enetaddr(*this, "enetaddr")
{
}
@ -33,6 +34,10 @@ void np600a3_device::lcc_ca_w(u16 data)
m_lcc->ca(1);
}
void np600a3_device::int1_ack_w(u8 data)
{
}
WRITE_LINE_MEMBER(np600a3_device::host_int_w)
{
logerror("%s: Host interrupt %s\n", machine().describe_context(), state ? "asserted" : "cleared");
@ -43,6 +48,11 @@ u16 np600a3_device::status_r()
return 0;
}
u8 np600a3_device::enetaddr_r(offs_t offset)
{
return m_enetaddr[offset];
}
void np600a3_device::mem_map(address_map &map)
{
map(0x00000, 0x7ffff).ram().share("netram"); // GM71256-12 x16
@ -54,8 +64,11 @@ void np600a3_device::mem_map(address_map &map)
void np600a3_device::io_map(address_map &map)
{
map(0x0000, 0x0001).w(FUNC(np600a3_device::lcc_ca_w));
map(0x0010, 0x0010).w("fromhost", FUNC(generic_latch_16_device::acknowledge_w));
map(0x0020, 0x0020).w(FUNC(np600a3_device::int1_ack_w));
map(0x0070, 0x007f).w("bitlatch", FUNC(ls259_device::write_a0));
map(0x0080, 0x0081).r(FUNC(np600a3_device::status_r));
map(0x0300, 0x033f).r(FUNC(np600a3_device::enetaddr_r)).umask16(0x00ff);
}
void np600a3_device::lcc_map(address_map &map)
@ -66,15 +79,19 @@ void np600a3_device::lcc_map(address_map &map)
void np600a3_device::device_add_mconfig(machine_config &config)
{
I80186(config, m_npcpu, 16_MHz_XTAL);
m_npcpu->set_addrmap(AS_PROGRAM, &np600a3_device::mem_map);
m_npcpu->set_addrmap(AS_IO, &np600a3_device::io_map);
i80186_cpu_device &npcpu(I80186(config, m_npcpu, 16_MHz_XTAL));
npcpu.set_addrmap(AS_PROGRAM, &np600a3_device::mem_map);
npcpu.set_addrmap(AS_IO, &np600a3_device::io_map);
npcpu.tmrout0_handler().set_inputline(m_npcpu, INPUT_LINE_NMI);
ls259_device &bitlatch(LS259(config, "bitlatch")); // U28
bitlatch.q_out_cb<1>().set(FUNC(np600a3_device::host_int_w));
bitlatch.q_out_cb<4>().set(m_lcc, FUNC(i82586_device::reset_w)).invert();
GENERIC_LATCH_16(config, "fromhost");
generic_latch_16_device &fromhost(GENERIC_LATCH_16(config, "fromhost"));
fromhost.data_pending_callback().set(m_npcpu, FUNC(i80186_cpu_device::int0_w));
fromhost.set_separate_acknowledge(true);
GENERIC_LATCH_16(config, "tohost");
I82586(config, m_lcc, 16_MHz_XTAL / 2); // clock presumed (20 MHz XTAL also present for SEEQ DQ8023A transceiver)
@ -87,10 +104,12 @@ ROM_START(np600a3)
ROM_LOAD16_BYTE("258-0032-00_rev_ba.u38", 0x0000, 0x2000, CRC(84ccb317) SHA1(3ecc8e265336f5d3b0f276f18dd1b7001778f2c3))
ROM_LOAD16_BYTE("258-0033-00_rev_ba.u39", 0x0001, 0x2000, CRC(0e0f726c) SHA1(520773e235a826438b025381cd3861df86d4965d))
// Undumped small devices (mostly or all PLDs):
ROM_REGION(0x20, "enetaddr", 0)
ROM_LOAD("020701079bfa.u29", 0x00, 0x20, NO_DUMP) // 16-pin device, probably SN74S288 or equivalent and different label and contents for each PCB
// Other undumped small devices (mostly or all PLDs):
// 258-0037-00 REV AA (U17, 20 pins)
// 258-0027-01 REV AB (U20, 20 pins)
// 020701079BFA (U29, 16 pins)
// 258-0031-00 REV AC (U34, PAL20xx, 24 pins)
// 258-0030-00 REV AA (U36, 20 pins)
// 258-0028-01 REV AA (U44, 20 pins)

3
src/devices/bus/isa/np600.h
View file

@ -28,8 +28,10 @@ protected:
private:
void lcc_ca_w(u16 data);
void int1_ack_w(u8 data);
DECLARE_WRITE_LINE_MEMBER(host_int_w);
u16 status_r();
u8 enetaddr_r(offs_t offset);
void mem_map(address_map &map);
void io_map(address_map &map);
@ -37,6 +39,7 @@ private:
required_device<cpu_device> m_npcpu;
required_device<i82586_device> m_lcc;
required_region_ptr<u8> m_enetaddr;
};
DECLARE_DEVICE_TYPE(NP600A3, np600a3_device)