summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/machine/7400.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/devices/machine/7400.cpp')
-rw-r--r--src/devices/machine/7400.cpp95
1 files changed, 0 insertions, 95 deletions
diff --git a/src/devices/machine/7400.cpp b/src/devices/machine/7400.cpp
deleted file mode 100644
index a7c4e1528b4..00000000000
--- a/src/devices/machine/7400.cpp
+++ /dev/null
@@ -1,95 +0,0 @@
-// license:BSD-3-Clause
-// copyright-holders:Ryan Holtz
-/*****************************************************************************
-
- 7400 Quad 2-Input NAND Gate
-
-*****************************************************************************/
-
-#include "emu.h"
-#include "7400.h"
-
-DEFINE_DEVICE_TYPE(TTL7400, ttl7400_device, "7400", "7400 Quad 2-Input NAND Gate")
-
-ttl7400_device::ttl7400_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
- : device_t(mconfig, TTL7400, tag, owner, clock)
- , m_y_func{{*this}, {*this}, {*this}, {*this}}
- , m_a(0)
- , m_b(0)
- , m_y(0)
-{
-}
-
-void ttl7400_device::device_start()
-{
- save_item(NAME(m_a));
- save_item(NAME(m_b));
- save_item(NAME(m_y));
-
- for (std::size_t bit = 0; bit < 4; bit++)
- m_y_func[bit].resolve_safe();
-}
-
-void ttl7400_device::device_reset()
-{
- m_a = 0;
- m_b = 0;
- m_y = 0;
-}
-
-void ttl7400_device::update()
-{
- uint8_t last_y = m_y;
-
- m_y = (m_a & m_b) & 0xf;
-
- if (m_y != last_y)
- {
- for (std::size_t bit = 0; bit < 4; bit++)
- {
- if (BIT(m_y, bit) == BIT(last_y, bit))
- continue;
-
- m_y_func[bit](BIT(m_y, bit));
- }
- }
-}
-
-void ttl7400_device::a_w(uint8_t line, uint8_t state)
-{
- uint8_t old_a = m_a;
- m_a &= ~(1 << line);
- m_a |= (state << line);
- if (old_a != m_a)
- update();
-}
-
-void ttl7400_device::b_w(uint8_t line, uint8_t state)
-{
- uint8_t old_b = m_b;
- m_b &= ~(1 << line);
- m_b |= (state << line);
- if (old_b != m_b)
- update();
-}
-
-uint8_t ttl7400_device::y_r(uint8_t line)
-{
- return (m_y >> line) & 1;
-}
-
-
-WRITE_LINE_MEMBER( ttl7400_device::a1_w ) { a_w(0, state); }
-WRITE_LINE_MEMBER( ttl7400_device::a2_w ) { a_w(1, state); }
-WRITE_LINE_MEMBER( ttl7400_device::a3_w ) { a_w(2, state); }
-WRITE_LINE_MEMBER( ttl7400_device::a4_w ) { a_w(3, state); }
-
-WRITE_LINE_MEMBER( ttl7400_device::b1_w ) { b_w(0, state); }
-WRITE_LINE_MEMBER( ttl7400_device::b2_w ) { b_w(1, state); }
-WRITE_LINE_MEMBER( ttl7400_device::b3_w ) { b_w(2, state); }
-WRITE_LINE_MEMBER( ttl7400_device::b4_w ) { b_w(3, state); }
-
-READ_LINE_MEMBER( ttl7400_device::y1_r ) { return y_r(0); }
-READ_LINE_MEMBER( ttl7400_device::y2_r ) { return y_r(1); }
-READ_LINE_MEMBER( ttl7400_device::y3_r ) { return y_r(2); }
-READ_LINE_MEMBER( ttl7400_device::y4_r ) { return y_r(3); }