// license:LGPL-2.1+ // copyright-holders:David Haywood, Angelo Salese, ElSemi, Andrew Gardner /* HNG64 Communication / Network CPU */ // this is driven by a KL5C80A12CFP which is basically a super-charged Z80 // MMU handling has been moved to the core; the rest is not implemented yet. // I believe this CPU is used for network only (the racing games) and not related to the I/O MCU /* 0x6010: tests RAM at [3]8000 */ #include "emu.h" #include "includes/hng64.h" #include "cpu/z80/kl5c80a12.h" void hng64_state::hng_comm_map(address_map &map) { map(0x00000, 0x7ffff).rom().region("user2", 0); map(0xf0000, 0xfffff).ram(); } void hng64_state::hng_comm_io_map(address_map &map) { map.global_mask(0xff); /* Reserved for the KL5C80 internal hardware */ // map(0x00, 0x07).rw(FUNC(hng64_state::hng64_comm_mmu_r), FUNC(hng64_state::hng64_comm_mmu_w)); // map(0x08, 0x1f).noprw(); /* Reserved */ // map(0x20, 0x25).rw(hng64_state::)); /* Timer/Counter B */ /* hng64 writes here */ // map(0x27, 0x27).noprw(); /* Reserved */ // map(0x28, 0x2b).rw(hng64_state::)); /* Timer/Counter A */ /* hng64 writes here */ // map(0x2c, 0x2f).rw(hng64_state::)); /* Parallel port A */ // map(0x30, 0x33).rw(hng64_state::)); /* Parallel port B */ // map(0x34, 0x37).rw(hng64_state::)); /* Interrupt controller */ /* hng64 writes here */ // map(0x38, 0x39).rw(hng64_state::)); /* Serial port */ /* hng64 writes here */ // map(0x3a, 0x3b).rw(hng64_state::)); /* System control register */ /* hng64 writes here */ // map(0x3c, 0x3f).noprw(); /* Reserved */ /* General IO */ map(0x50, 0x57).rw(FUNC(hng64_state::hng64_com_share_r), FUNC(hng64_state::hng64_com_share_w)); // map(0x72, 0x72).w(hng64_state::)); /* dunno yet */ } void hng64_state::reset_net() { // m_comm->pulse_input_line(INPUT_LINE_NMI, attotime::zero); // reset the CPU and let 'er rip // m_comm->set_input_line(INPUT_LINE_HALT, ASSERT_LINE); // hold on there pardner... } void hng64_state::hng64_network(machine_config &config) { KL5C80A12(config, m_comm, HNG64_MASTER_CLOCK / 4); /* KL5C80A12CFP - binary compatible with Z80. */ m_comm->set_addrmap(AS_PROGRAM, &hng64_state::hng_comm_map); m_comm->set_addrmap(AS_IO, &hng64_state::hng_comm_io_map); }