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https://github.com/holub/mame
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machine/7400.cpp: Removed unused 7400 logic device.
This commit is contained in:
Vas Crabb
parent
118d732c30
commit
4701887d6c
@ -435,18 +435,6 @@ if (MACHINES["7200FIFO"]~=null) then
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}
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end
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---------------------------------------------------
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--
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--@src/devices/machine/7400.h,MACHINES["TTL7400"] = true
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---------------------------------------------------
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if (MACHINES["TTL7400"]~=null) then
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files {
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MAME_DIR .. "src/devices/machine/7400.cpp",
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MAME_DIR .. "src/devices/machine/7400.h",
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}
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end
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---------------------------------------------------
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--
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--@src/devices/machine/7404.h,MACHINES["TTL7404"] = true
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@ -1,92 +0,0 @@
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// license:BSD-3-Clause
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// copyright-holders:Ryan Holtz
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/*****************************************************************************
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7400 Quad 2-Input NAND Gate
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*****************************************************************************/
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#include "emu.h"
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#include "7400.h"
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DEFINE_DEVICE_TYPE(TTL7400, ttl7400_device, "7400", "7400 Quad 2-Input NAND Gate")
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ttl7400_device::ttl7400_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
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: device_t(mconfig, TTL7400, tag, owner, clock)
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, m_y_func(*this)
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, m_a(0)
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, m_b(0)
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, m_y(0)
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{
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}
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void ttl7400_device::device_start()
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{
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save_item(NAME(m_a));
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save_item(NAME(m_b));
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save_item(NAME(m_y));
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}
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void ttl7400_device::device_reset()
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{
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m_a = 0;
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m_b = 0;
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m_y = 0;
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}
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void ttl7400_device::update()
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{
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uint8_t last_y = m_y;
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m_y = (m_a & m_b) & 0xf;
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if (m_y != last_y)
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{
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for (std::size_t bit = 0; bit < 4; bit++)
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{
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if (BIT(m_y, bit) == BIT(last_y, bit))
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continue;
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m_y_func[bit](BIT(m_y, bit));
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}
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}
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}
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void ttl7400_device::a_w(uint8_t line, uint8_t state)
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{
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uint8_t old_a = m_a;
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m_a &= ~(1 << line);
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m_a |= (state << line);
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if (old_a != m_a)
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update();
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}
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void ttl7400_device::b_w(uint8_t line, uint8_t state)
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{
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uint8_t old_b = m_b;
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m_b &= ~(1 << line);
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m_b |= (state << line);
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if (old_b != m_b)
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update();
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}
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uint8_t ttl7400_device::y_r(uint8_t line)
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{
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return (m_y >> line) & 1;
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}
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void ttl7400_device::a1_w(int state) { a_w(0, state); }
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void ttl7400_device::a2_w(int state) { a_w(1, state); }
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void ttl7400_device::a3_w(int state) { a_w(2, state); }
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void ttl7400_device::a4_w(int state) { a_w(3, state); }
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void ttl7400_device::b1_w(int state) { b_w(0, state); }
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void ttl7400_device::b2_w(int state) { b_w(1, state); }
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void ttl7400_device::b3_w(int state) { b_w(2, state); }
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void ttl7400_device::b4_w(int state) { b_w(3, state); }
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int ttl7400_device::y1_r() { return y_r(0); }
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int ttl7400_device::y2_r() { return y_r(1); }
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int ttl7400_device::y3_r() { return y_r(2); }
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int ttl7400_device::y4_r() { return y_r(3); }
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@ -1,85 +0,0 @@
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// license:BSD-3-Clause
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// copyright-holders:Ryan Holtz
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/*****************************************************************************
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7400 Quad 2-Input NAND Gate
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***********************************************************************
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Connection Diagram:
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___ ___
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1A 1 |* u | 14 Vcc
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1B 2 | | 13 4B
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1Y 3 | | 12 4A
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2A 4 | | 11 4Y
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2B 5 | | 10 3B
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2Y 6 | | 9 3A
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GND 7 |_______| 8 3Y
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Truth Table:
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___________
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| A | B | Y |
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|---|---|---|
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| 0 | 0 | 0 |
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| 0 | 1 | 0 |
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| 1 | 0 | 0 |
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| 1 | 1 | 1 |
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|___|___|___|
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**********************************************************************/
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#ifndef MAME_MACHINE_7400_H
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#define MAME_MACHINE_7400_H
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#pragma once
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class ttl7400_device : public device_t
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{
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public:
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// construction/destruction
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ttl7400_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
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template <std::size_t Bit> auto y_cb() { return m_y_func[Bit].bind(); }
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// public interfaces
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void a1_w(int state);
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void a2_w(int state);
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void a3_w(int state);
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void a4_w(int state);
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void b1_w(int state);
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void b2_w(int state);
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void b3_w(int state);
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void b4_w(int state);
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int y1_r();
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int y2_r();
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int y3_r();
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int y4_r();
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protected:
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void a_w(uint8_t line, uint8_t state);
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void b_w(uint8_t line, uint8_t state);
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uint8_t y_r(uint8_t line);
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// device-level overrides
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virtual void device_start() override;
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virtual void device_reset() override;
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private:
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void update();
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// callbacks
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devcb_write_line::array<4> m_y_func;
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// inputs
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uint8_t m_a; // pins 1,4,9,12
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uint8_t m_b; // pins 2,5,10,13
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// outputs
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uint8_t m_y; // pins 3,6,8,11
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};
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// device type definition
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DECLARE_DEVICE_TYPE(TTL7400, ttl7400_device)
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#endif // MAME_MACHINE_7400_H
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