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cexpert: add cpu freq config

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This commit is contained in:
hap 2022-04-21 16:37:24 +02:00
parent c8b95f78ec
commit d4c5834a46
1 changed files with 19 additions and 0 deletions
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19
src/mame/drivers/novag_cexpert.cpp
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@ -16,6 +16,9 @@ Hardware notes:
I/O is again similar to supercon
The first version was on a modified Super Constellation PCB. 4MHz CPU speed,
and 4 TMM27128 with identical ROM contents as the newer version.
******************************************************************************/
#include "emu.h"
@ -50,8 +53,11 @@ public:
// machine configs
void cexpert(machine_config &config);
DECLARE_INPUT_CHANGED_MEMBER(switch_cpu_freq) { set_cpu_freq(); }
protected:
virtual void machine_start() override;
virtual void machine_reset() override { set_cpu_freq(); }
private:
// devices/pointers
@ -61,6 +67,8 @@ private:
required_device<beep_device> m_beeper;
required_ioport_array<8> m_inputs;
void set_cpu_freq();
// address maps
void main_map(address_map &map);
@ -82,6 +90,12 @@ void cexpert_state::machine_start()
save_item(NAME(m_led_select));
}
void cexpert_state::set_cpu_freq()
{
// old version had a 4MHz CPU
m_maincpu->set_unscaled_clock((ioport("FAKE")->read() & 1) ? (10_MHz_XTAL/2) : (8_MHz_XTAL/2));
}
/******************************************************************************
@ -192,6 +206,11 @@ static INPUT_PORTS_START( cexpert )
PORT_START("IN.7")
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_Q) PORT_NAME("Go")
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_1) PORT_NAME("Take Back / Restore")
PORT_START("FAKE")
PORT_CONFNAME( 0x01, 0x01, "CPU Frequency" ) PORT_CHANGED_MEMBER(DEVICE_SELF, cexpert_state, switch_cpu_freq, 0) // factory set
PORT_CONFSETTING( 0x00, "4MHz" )
PORT_CONFSETTING( 0x01, "5MHz" )
INPUT_PORTS_END