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zt8802: Moderate de-skeletonization

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This commit is contained in:
AJR 2020-12-29 08:44:32 -05:00
parent f8d6d4a823
commit 8a78236c6a
1 changed files with 61 additions and 6 deletions
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67
src/mame/drivers/zt8802.cpp
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@ -1,12 +1,10 @@
// license:BSD-3-Clause
// copyright-holders:
// copyright-holders:AJR
/***********************************************************************************************************************************
2017-11-02 Skeleton
Ziatech ZT-8802 single-board computer. Advert says: V40 CPU @ 8MHz, 1MB DRAM, 512K EPROM, 3 RS-232 PORTS.
CPU is NEC D70208L-10 (V40) which is a V20 with 8251,8253,8255 included.
CPU is NEC D70208L-10 (V40) which is a V20 with 8251,8253,8259 included.
Chips: Maxim MAX249CQH, Exar XT16C452CJPS, Ziatech ICPSMCI-16C49A, 2x GAL22V10D, 2x ACT15245, 2x ACT11245,
ACT11240, PALCE 16V??-15JC, 2x CYM1465LPD-120C (RAM).
@ -16,25 +14,82 @@ Other: A 3.6volt battery, a tiny crystal, a red LED, and about 2 dozen jumpers.
************************************************************************************************************************************/
#include "emu.h"
#include "cpu/nec/v5x.h"
#include "machine/ds1302.h"
class zt8802_state : public driver_device
{
public:
zt8802_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
// , m_maincpu(*this, "maincpu")
, m_maincpu(*this, "maincpu")
, m_pia(*this, "pia")
, m_rtc(*this, "rtc")
{ }
void zt8802(machine_config &config);
private:
// required_device<cpu_device> m_maincpu;
void pia_w(offs_t offset, u8 data);
u8 rtc_r();
void rtc_w(u8 data);
void mem_map(address_map &map);
void io_map(address_map &map);
required_device<cpu_device> m_maincpu;
required_shared_ptr<u8> m_pia;
required_device<ds1202_device> m_rtc;
};
void zt8802_state::pia_w(offs_t offset, u8 data)
{
if (offset == 5)
m_rtc->ce_w(BIT(data, 4));
m_pia[offset] = data;
}
u8 zt8802_state::rtc_r()
{
if (!machine().side_effects_disabled())
m_rtc->sclk_w(0);
u8 data = m_rtc->io_r();
if (!machine().side_effects_disabled())
m_rtc->sclk_w(1);
return data;
}
void zt8802_state::rtc_w(u8 data)
{
m_rtc->sclk_w(0);
m_rtc->io_w(BIT(data, 0));
m_rtc->sclk_w(1);
}
void zt8802_state::mem_map(address_map &map)
{
map(0x00000, 0x7ffff).ram();
map(0x80000, 0xfffff).rom().region("roms", 0);
}
void zt8802_state::io_map(address_map &map)
{
map(0x0080, 0x0080).nopr(); // watchdog?
map(0xfa00, 0xfa07).ram().share("pia").w(FUNC(zt8802_state::pia_w)); //.rw("pia", FUNC(zt16c49_device::read), FUNC(zt16c49_device::write));
map(0xfa80, 0xfa80).rw(FUNC(zt8802_state::rtc_r), FUNC(zt8802_state::rtc_w));
}
static INPUT_PORTS_START( zt8802 )
INPUT_PORTS_END
void zt8802_state::zt8802(machine_config &config)
{
V40(config, m_maincpu, 16'000'000);
m_maincpu->set_addrmap(AS_PROGRAM, &zt8802_state::mem_map);
m_maincpu->set_addrmap(AS_IO, &zt8802_state::io_map);
DS1202(config, m_rtc, 32'768);
}
ROM_START( zt8802 )