diff --git a/src/emu/devcb.cpp b/src/emu/devcb.cpp
index 12f84a01f5f..a3655cf8e87 100644
--- a/src/emu/devcb.cpp
+++ b/src/emu/devcb.cpp
@@ -267,6 +267,7 @@ void devcb_read_base::resolve()
 			case CALLBACK_INPUTLINE:
 			case CALLBACK_ASSERTLINE:
 			case CALLBACK_CLEARLINE:
+			case CALLBACK_HOLDLINE:
 				throw emu_fatalerror("Device read callbacks can't be connected to input lines\n");
 		}
 	}
@@ -526,6 +527,11 @@ void devcb_write_base::resolve()
 				resolve_inputline();
 				m_adapter = &devcb_write_base::write_clearline_adapter;
 				break;
+
+			case CALLBACK_HOLDLINE:
+				resolve_inputline();
+				m_adapter = &devcb_write_base::write_holdline_adapter;
+				break;
 		}
 	}
 	catch (binding_type_exception &binderr)
@@ -691,3 +697,14 @@ void devcb_write_base::write_clearline_adapter(address_space &space, offs_t offs
 	if (unshift_mask_xor(data) & 1)
 		m_target.device->execute().set_input_line(m_target_int, CLEAR_LINE);
 }
+
+//-------------------------------------------------
+//  write_clearline_adapter - write to a device's
+//  input line
+//-------------------------------------------------
+
+void devcb_write_base::write_holdline_adapter(address_space &space, offs_t offset, u64 data, u64 mask)
+{
+	if (unshift_mask_xor(data) & 1)
+		m_target.device->execute().set_input_line(m_target_int, HOLD_LINE);
+}
diff --git a/src/emu/devcb.h b/src/emu/devcb.h
index 58319bd34fa..8c6a5781d8e 100644
--- a/src/emu/devcb.h
+++ b/src/emu/devcb.h
@@ -31,6 +31,7 @@
 #define DEVCB_INPUTLINE(_tag, _line) devcb_base::inputline_desc(_tag, _line)
 #define DEVCB_ASSERTLINE(_tag, _line) devcb_base::assertline_desc(_tag, _line)
 #define DEVCB_CLEARLINE(_tag, _line) devcb_base::clearline_desc(_tag, _line)
+#define DEVCB_HOLDLINE(_tag, _line) devcb_base::holdline_desc(_tag, _line)
 #define DEVCB_VCC DEVCB_CONSTANT(1)
 #define DEVCB_GND DEVCB_CONSTANT(0)
 
@@ -104,7 +105,8 @@ protected:
 		CALLBACK_CONSTANT,
 		CALLBACK_INPUTLINE,
 		CALLBACK_ASSERTLINE,
-		CALLBACK_CLEARLINE
+		CALLBACK_CLEARLINE,
+		CALLBACK_HOLDLINE
 	};
 
 	// construction/destruction
@@ -180,6 +182,14 @@ public:
 		int m_inputnum;
 	};
 
+	class holdline_desc
+	{
+	public:
+		holdline_desc(const char *tag, int inputnum) { m_tag = tag; m_inputnum = inputnum; }
+		const char *m_tag;
+		int m_inputnum;
+	};
+
 	// shared callback setters
 	devcb_base &set_callback(null_desc null) { reset(CALLBACK_NONE); return *this; }
 	devcb_base &set_callback(ioport_desc ioport) { reset(CALLBACK_IOPORT); m_target_tag = ioport.m_tag; return *this; }
@@ -300,6 +310,7 @@ public:
 	devcb_base &set_callback(inputline_desc inputline) { reset(CALLBACK_INPUTLINE); m_target_tag = inputline.m_tag; m_target_int = inputline.m_inputnum; return *this; }
 	devcb_base &set_callback(assertline_desc inputline) { reset(CALLBACK_ASSERTLINE); m_target_tag = inputline.m_tag; m_target_int = inputline.m_inputnum; return *this; }
 	devcb_base &set_callback(clearline_desc inputline) { reset(CALLBACK_CLEARLINE); m_target_tag = inputline.m_tag; m_target_int = inputline.m_inputnum; return *this; }
+	devcb_base &set_callback(holdline_desc inputline) { reset(CALLBACK_HOLDLINE); m_target_tag = inputline.m_tag; m_target_int = inputline.m_inputnum; return *this; }
 	devcb_write_base &chain_alloc();
 
 	// resolution
@@ -326,6 +337,7 @@ private:
 	void write_inputline_adapter(address_space &space, offs_t offset, u64 data, u64 mask);
 	void write_assertline_adapter(address_space &space, offs_t offset, u64 data, u64 mask);
 	void write_clearline_adapter(address_space &space, offs_t offset, u64 data, u64 mask);
+	void write_holdline_adapter(address_space &space, offs_t offset, u64 data, u64 mask);
 
 	// configuration
 	write_line_delegate m_writeline;            // copy of registered line writer