DC11 framework

CMakeLists.txt

@@ -29,6 +29,7 @@ add_executable(
   console_ncurses.cpp
   console_posix.cpp
   cpu.cpp
+  dc11.cpp
   debugger.cpp
   disk_backend.cpp
   disk_backend_file.cpp

bus.cpp

@@ -8,6 +8,7 @@
 #include "bus.h"
 #include "gen.h"
 #include "cpu.h"
+#include "dc11.h"
 #include "kw11-l.h"
 #include "log.h"
 #include "memory.h"
@@ -41,6 +42,7 @@ bus::~bus()
 	delete tty_;
 	delete mmu_;
 	delete m;
+	delete dc11_;
 }
 
 #if IS_POSIX
@@ -69,7 +71,7 @@ json_t *bus::serialize() const
 	if (rk05_)
 		json_object_set(j_out, "rk05", rk05_->serialize());
 
-	// TODO: tm11
+	// TODO: tm11, dc11
 
 	return j_out;
 }
@@ -122,7 +124,7 @@ bus *bus::deserialize(const json_t *const j, console *const cnsl, std::atomic_ui
 		b->add_rk05(rk05_);
 	}
 
-	// TODO: tm11
+	// TODO: tm11, dc11
 
 	return b;
 }
@@ -156,6 +158,8 @@ void bus::reset()
 		tty_->reset();
 	if (kw11_l_)
 		kw11_l_->reset();
+	if (dc11_)
+		dc11_->reset();
 }
 
 void bus::add_KW11_L(kw11_l *const kw11_l_)
@@ -206,6 +210,12 @@ void bus::add_tty(tty *const tty_)
 	this->tty_ = tty_;
 }
 
+void bus::add_DC11(dc11 *const dc11_)
+{
+	delete this->dc11_;
+	this->dc11_ = dc11_;
+}
+
 void bus::init()
 {
 	mmu_->setMMR0(0);
@@ -457,29 +467,20 @@ uint16_t bus::read(const uint16_t addr_in, const word_mode_t word_mode, const rm
 			}
 		}
 
-		if (tm11 && a >= TM_11_BASE && a < TM_11_END && !peek_only) {
-			DOLOG(debug, false, "READ-I/O TM11 register %d", (a - TM_11_BASE) / 2);
-
+		if (tm11 && a >= TM_11_BASE && a < TM_11_END && !peek_only)
 			return word_mode == wm_byte ? tm11->readByte(a) : tm11->readWord(a);
-		}
-
-		if (rk05_ && a >= RK05_BASE && a < RK05_END && !peek_only) {
-			DOLOG(debug, false, "READ-I/O RK05 register %d", (a - RK05_BASE) / 2);
 
+		if (rk05_ && a >= RK05_BASE && a < RK05_END && !peek_only)
 			return word_mode == wm_byte ? rk05_->readByte(a) : rk05_->readWord(a);
-		}
-
-		if (rl02_ && a >= RL02_BASE && a < RL02_END && !peek_only) {
-			DOLOG(debug, false, "READ-I/O RL02 register %d", (a - RL02_BASE) / 2);
 
+		if (rl02_ && a >= RL02_BASE && a < RL02_END && !peek_only)
 			return word_mode == wm_byte ? rl02_->readByte(a) : rl02_->readWord(a);
-		}
-
-		if (tty_ && a >= PDP11TTY_BASE && a < PDP11TTY_END && !peek_only) {
-			DOLOG(debug, false, "READ-I/O TTY register %d", (a - PDP11TTY_BASE) / 2);
 
+		if (tty_ && a >= PDP11TTY_BASE && a < PDP11TTY_END && !peek_only)
 			return word_mode == wm_byte ? tty_->readByte(a) : tty_->readWord(a);
-		}
+
+		if (dc11_ && a >= DC11_BASE && a < DC11_END && !peek_only)
+			return word_mode == wm_byte ? dc11_->read_byte(a) : dc11_->read_word(a);
 
 		// LO size register field must be all 1s, so subtract 1
 		uint32_t system_size = m->get_memory_size() / 64 - 1;

bus.h

@@ -9,6 +9,7 @@
 #include <stdio.h>
 
 #include "gen.h"
+#include "dc11.h"
 #include "mmu.h"
 #include "rk05.h"
 #include "rl02.h"
@@ -77,6 +78,7 @@ private:
 	kw11_l  *kw11_l_ { nullptr };
 	mmu     *mmu_    { nullptr };
 	memory  *m       { nullptr };
+	dc11    *dc11_   { nullptr };
 
 	uint16_t microprogram_break_register { 0 };
 
@@ -113,6 +115,7 @@ public:
 	void add_rl02  (rl02   *const rl02_  );
 	void add_tty   (tty    *const tty_   );
 	void add_KW11_L(kw11_l *const kw11_l_);
+	void add_DC11  (dc11   *const dc11_  );
 
 	memory *getRAM()    { return m;       }
 	cpu    *getCpu()    { return c;       }
@@ -121,6 +124,7 @@ public:
 	mmu    *getMMU()    { return mmu_;    }
 	rk05   *getRK05()   { return rk05_;   }
 	rl02   *getRL02()   { return rl02_;   }
+	dc11   *getDC11()   { return dc11_;   }
 
 	uint16_t read    (const uint16_t a, const word_mode_t word_mode, const rm_selection_t mode_selection, const bool peek_only=false, const d_i_space_t s = i_space);
 	uint16_t readByte(const uint16_t a) { return read(a, wm_byte, rm_cur); }

dc11.cpp

@@ -0,0 +1,65 @@
+// (C) 2024 by Folkert van Heusden
+// Released under MIT license
+
+#include "bus.h"
+#include "dc11.h"
+
+
+dc11::dc11(bus *const b): b(b)
+{
+}
+
+dc11::~dc11()
+{
+	stop_flag = true;
+}
+
+void dc11::reset()
+{
+}
+
+uint8_t dc11::read_byte(const uint16_t addr)
+{
+	uint16_t v = read_word(addr & ~1);
+
+	if (addr & 1)
+		return v >> 8;
+
+	return v;
+}
+
+uint16_t dc11::read_word(const uint16_t addr)
+{
+	const int reg   = (addr - DC11_BASE) / 2;
+
+	uint16_t  vtemp = registers[reg];
+
+	DOLOG(debug, false, "DC11: read register %06o (%d): %06o", addr, reg, vtemp);
+
+	return vtemp;
+}
+
+void dc11::write_byte(const uint16_t addr, const uint8_t v)
+{
+	uint16_t vtemp = registers[(addr - DC11_BASE) / 2];
+	
+	if (addr & 1) {
+		vtemp &= ~0xff00;
+		vtemp |= v << 8;
+	}
+	else {
+		vtemp &= ~0x00ff;
+		vtemp |= v;
+	}
+
+	write_word(addr, vtemp);
+}
+
+void dc11::write_word(const uint16_t addr, uint16_t v)
+{
+	const int reg = (addr - DC11_BASE) / 2;
+
+	DOLOG(debug, false, "DC11: set register %06o (%d) to %o", addr, reg, v);
+
+	registers[reg] = v;
+}

dc11.h

@@ -0,0 +1,42 @@
+// (C) 2024 by Folkert van Heusden
+// Released under MIT license
+
+#pragma once
+#include <atomic>
+#include <cstdint>
+
+#include "gen.h"
+#include "bus.h"
+#include "log.h"
+
+#define DC11_RCSR 0174000 // receiver status register
+#define DC11_BASE DC11_RCSR
+#define DC11_END  (DC11_RCSR + 2)
+
+class bus;
+
+class dc11
+{
+private:
+	bus             *const b      { nullptr };
+
+	uint16_t         registers[4] {         };
+	std::atomic_bool stop_flag    { false   };
+
+public:
+	dc11(bus *const b);
+	virtual ~dc11();
+
+#if IS_POSIX
+//	json_t *serialize();
+//	static tty *deserialize(const json_t *const j, bus *const b, console *const cnsl);
+#endif
+
+	void reset();
+
+	uint8_t read_byte(const uint16_t addr);
+	uint16_t read_word(const uint16_t addr);
+
+	void write_byte(const uint16_t addr, const uint8_t v);
+	void write_word(const uint16_t addr, uint16_t v);
+};