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fidelity/card: get rid of high freq timer (optimization)

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This commit is contained in:
hap 2022-07-21 14:09:08 +02:00
parent 3aa1e36e69
commit 4875de8fbe
1 changed files with 10 additions and 5 deletions
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15
src/mame/fidelity/card.cpp
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@ -24,6 +24,8 @@ BTANB:
TODO:
- verify if BV2 is a newer program version than VBRC
- the VFD scrolls around 30% too slow compared to the real one, probably depends
on how many T1 clock edges the 8041 can detect (see mcu_t1_r)
*******************************************************************************
@ -172,7 +174,6 @@ Two card decks exist (red and blue), each has the same set of barcodes.
#include "cpu/z80/z80.h"
#include "cpu/mcs48/mcs48.h"
#include "machine/i8243.h"
#include "machine/clock.h"
#include "machine/timer.h"
#include "sound/dac.h"
#include "sound/s14001a.h"
@ -240,6 +241,7 @@ private:
void mcu_p1_w(u8 data);
u8 mcu_p2_r();
DECLARE_READ_LINE_MEMBER(mcu_t0_r);
DECLARE_READ_LINE_MEMBER(mcu_t1_r);
template<int P> void ioexp_port_w(uint8_t data);
};
@ -351,6 +353,12 @@ READ_LINE_MEMBER(card_state::mcu_t0_r)
return m_barcode & 1;
}
READ_LINE_MEMBER(card_state::mcu_t1_r)
{
// T1: xtal / 4 (do *2 for high-low transitions)
return (machine().time().as_ticks(5_MHz_XTAL / 4 * 2)) & 1;
}
/******************************************************************************
@ -582,10 +590,7 @@ void card_state::brc_base(machine_config &config)
m_mcu->p2_out_cb().set(m_i8243, FUNC(i8243_device::p2_w));
m_mcu->prog_out_cb().set(m_i8243, FUNC(i8243_device::prog_w));
m_mcu->t0_in_cb().set(FUNC(card_state::mcu_t0_r));
// MCU T1 tied to master clock / 4
CLOCK(config, "t1_clock", 5_MHz_XTAL/4);
m_mcu->t1_in_cb().set("t1_clock", FUNC(clock_device::signal_r)).invert();
m_mcu->t1_in_cb().set(FUNC(card_state::mcu_t1_r));
I8243(config, m_i8243);
m_i8243->p4_out_cb().set(FUNC(card_state::ioexp_port_w<0>));