Move around stuff, split UI

8 files changed, 324 insertions, 261 deletions

diff --git a/nandgame/cpp/CMakeLists.txt b/nandgame/cpp/CMakeLists.txt
index 002bfcb..4da5c03 100644
--- a/nandgame/cpp/CMakeLists.txt
+++ b/nandgame/cpp/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.20)
 
 project(simpc)
 find_package(verilator HINTS $ENV{VERILATOR_ROOT})
-add_executable(Vcomputer Vcomputer__main.cpp disas.cpp)
+add_executable(Vcomputer Vcomputer__main.cpp disas.cpp simpc_ui.cpp)
 verilate(Vcomputer
     SOURCES ../computer.sv
     TOP_MODULE computer
diff --git a/nandgame/cpp/Vcomputer__main.cpp b/nandgame/cpp/Vcomputer__main.cpp
index f857be1..50f7c1b 100644
--- a/nandgame/cpp/Vcomputer__main.cpp
+++ b/nandgame/cpp/Vcomputer__main.cpp
@@ -1,81 +1,20 @@
 // Verilated -*- C++ -*-
 // DESCRIPTION: Verilator output: main() simulation loop, created with --main
 
+#include "simpc_config.h"
+#include "simpc_types.h"
+#include "simpc_ui.h"
+
+#include "Vcomputer.h"
 #include "Vcomputer___024root.h"
-#include "Vcomputer_alu.h"
 #include "Vcomputer_computer.h"
-#include "Vcomputer_instruction_decode.h"
 #include "Vcomputer_my_mem__D10_DB10000.h"
 #include "verilated.h"
-#include "Vcomputer.h"
-#include <cinttypes>
-#include <cstdint>
 #include <cstdio>
 #include <sched.h>
 
-#define TICKS_PER_INS 2
-#define NCUR 1
-#include "disas.h"
-
-#define NCUR_OFFSET 3
-
-#if NCUR
-#include <ncurses.h>
-#define NCUR_DELAY_MS 100
-#define NCUR_X 5
-
-#define PRINT_ME(x, y, ...) { mvprintw(x, y, __VA_ARGS__); }
-#define PRINT_NEXT() { refresh(); napms(NCUR_DELAY_MS); }
-
-#else
-
-#define PRINT_ME(x, y, ...) { printf("%*s", x, ""); printf(__VA_ARGS__); printf("\n"); }
-#define PRINT_NEXT() { puts("-----"); }
-
-#endif
-
 //======================
 
-enum class StepPosition_t {
-  BEFORE_EVAL,
-  AFTER_EVAL
-};
-
-void draw_ui(const std::unique_ptr<Vcomputer> &topp, int &i, StepPosition_t sp) {
-  uint16_t opcode = topp->computer->PC_content_int;
-
-  PRINT_ME(1, 1, "Step: %10d \b%c", i, sp == StepPosition_t::BEFORE_EVAL ? 'A' : 'B');
-  PRINT_ME(1 + NCUR_OFFSET, NCUR_X, "CLK1: %4d\tPC: @0x%04X\tINS: 0x%04X\tHLT: %d",
-           topp->clk_in,
-           // wrong
-           // topp->computer->clk_in,
-           topp->computer->PC_addr_int, opcode,
-           topp->halt
-  );
-
-  auto insline = print_decoded(opcode, true);
-  PRINT_ME(3 + NCUR_OFFSET, NCUR_X, "%-80s", insline.c_str());
-
-  // keep old state
-  if (topp->halt)
-    return;
-
-  PRINT_ME(5 + NCUR_OFFSET, NCUR_X,
-           "A: 0x%04X\tD: 0x%04X\tM: 0x%04X\tRES: 0x%04X",
-           topp->computer->reg_A_int, topp->computer->reg_D_int,
-           topp->computer->reg_pA_int, topp->computer->result_int);
-  PRINT_ME(6 + NCUR_OFFSET, NCUR_X,
-           "%9" PRId16 "\t%9" PRId16 "\t%9" PRId16 "\t%11" PRId16,
-           topp->computer->reg_A_int, topp->computer->reg_D_int,
-           topp->computer->reg_pA_int, topp->computer->result_int);
-  PRINT_ME(7 + NCUR_OFFSET, NCUR_X, "ALU");
-  PRINT_ME(8 + NCUR_OFFSET, NCUR_X, "X: %5" PRId16 "\tY: %5" PRId16,
-           topp->computer->CPU->my_alu->int_op_x,
-           topp->computer->CPU->my_alu->int_op_y)
-
-  PRINT_NEXT();
-}
-
 int main(int argc, char **argv, char **) {
 
   // Setup context, defaults, and parse command line
@@ -112,66 +51,53 @@ int main(int argc, char **argv, char **) {
     exit(-1);
   }
 
-#if NCUR
-    initscr();
-    curs_set(0);
-#endif
+  draw_init();
 
-    while (VL_LIKELY(!contextp->gotFinish()) && i < 500) {
-        // doesn't work.
-        // topp->computer->clk_in = ~topp->computer->clk_in;
+  while (VL_LIKELY(!contextp->gotFinish()) && i < 500) {
+    // doesn't work.
+    // topp->computer->clk_in = ~topp->computer->clk_in;
 
-        if (i != 0 && (i % TICKS_PER_INS) == 0) {
-          topp->clk_in = !topp->clk_in;
-        }
+    if (i != 0 && (i % TICKS_PER_INS) == 0) {
+      topp->clk_in = !topp->clk_in;
+    }
 
-        draw_ui(topp, i, StepPosition_t::BEFORE_EVAL);
+    draw_ui(topp, i, StepPosition_t::BEFORE_EVAL);
 
-        // Evaluate model
-        topp->eval();
+    // Evaluate model
+    topp->eval();
 
-        // both bits 14 and 15 need to be set
-        if (topp->halt)
-          break;
+    // both bits 14 and 15 need to be set
+    if (topp->halt)
+      break;
 
-        draw_ui(topp, i, StepPosition_t::AFTER_EVAL);
+    draw_ui(topp, i, StepPosition_t::AFTER_EVAL);
 
-        // Advance time
-        contextp->timeInc(1);
-        i++;
-    }
-
-#if NCUR
-    refresh();
-#endif
+    // Advance time
+    contextp->timeInc(1);
+    i++;
+  }
 
-    PRINT_ME(10 + NCUR_OFFSET, 10, "Simulation finished.");
-    if (topp->halt) {
-      PRINT_ME(11 + NCUR_OFFSET, 10, "Halt encountered.");
-    } else if (!contextp->gotFinish()) {
-      PRINT_ME(11 + NCUR_OFFSET, 10, "Step count exceeded.");
-    } else {
-      PRINT_ME(11 + NCUR_OFFSET, 10, "Regular finish.");
-    }
+  draw_finish(contextp, topp);
 
-    if (VL_LIKELY(!contextp->gotFinish())) {
-        VL_DEBUG_IF(VL_PRINTF("+ Exiting without $finish; no events left\n"););
-    }
+  if (VL_LIKELY(!contextp->gotFinish())) {
+    VL_DEBUG_IF(VL_PRINTF("+ Exiting without $finish; no events left\n"););
+  }
 
-    // for tracefile to properly show
-    for (int i = 0; i < 10; i++) {
-      contextp->timeInc(1);
-      topp->eval();
-    }
-    // Execute 'final' processes
-    topp->final();
+  // for tracefile to properly show
+  for (int i = 0; i < 10; i++) {
+    contextp->timeInc(1);
+    topp->eval();
+  }
+  // Execute 'final' processes
+  topp->final();
 
-    // Print statistical summary report
-    //contextp->statsPrintSummary();
+  // Print statistical summary report
+  // contextp->statsPrintSummary();
 
 #if NCUR
-    getch(); endwin();
+  getch();
+  endwin();
 #endif
 
-    return 0;
+  return 0;
 }
diff --git a/nandgame/cpp/disas.cpp b/nandgame/cpp/disas.cpp
index ac7ca0c..f6c3cf7 100644
--- a/nandgame/cpp/disas.cpp
+++ b/nandgame/cpp/disas.cpp
@@ -2,193 +2,211 @@
 
 #include "disas.h"
 
+#include <iomanip>
+#include <sstream>
 #include <string>
 #include <vector>
-#include <sstream>
-#include <iomanip>
 
-static const std::string ZERO      = "#0";
+static const std::string ZERO = "#0";
 static const std::string DEST_NONE = "_";
 static const std::string JUMP_NONE = "";
 
-static const std::vector<std::string> JUMPS_IF_NZERO = {"jgt", "jlt", "jne", "jmp"};
-static const std::vector<std::string> JUMPS_IF_ZERO  = {"jge", "jle", "jeq", "jmp"};
+static const std::vector<std::string> JUMPS_IF_NZERO = {"jgt", "jlt", "jne",
+                                                        "jmp"};
+static const std::vector<std::string> JUMPS_IF_ZERO = {"jge", "jle", "jeq",
+                                                       "jmp"};
 
 struct Decoded {
-    std::string mnemonic;
-    std::string dest;
-    std::string op1;
-    std::string op2;
-    std::string jumpdest;
+  std::string mnemonic;
+  std::string dest;
+  std::string op1;
+  std::string op2;
+  std::string jumpdest;
 };
 
 static bool in_list(const std::string &s, const std::vector<std::string> &v) {
-    for (const auto &x : v) {
-        if (x == s) return true;
-    }
-    return false;
+  for (const auto &x : v) {
+    if (x == s)
+      return true;
+  }
+  return false;
 }
 
 static std::string decode_jump(uint16_t ins) {
-    if ((ins & 0x7) == 0) {
-        return JUMP_NONE;
-    }
-
-    if ((ins & 0x7) == 0x7) {
-        return "jmp";
-    }
-
-    bool jl = (ins & (1 << 2)) != 0;
-    bool je = (ins & (1 << 1)) != 0;
-    bool jg = (ins & (1 << 0)) != 0;
-
-    if (jl && je) {
-        return "jle";
-    }
-    if (jl && jg) {
-        return "jne";
-    }
-    if (je && jg) {
-        return "jge";
-    }
-
-    if (jl) return "jlt";
-    if (je) return "jeq";
-    if (jg) return "jgt";
-
-    return "<unknown>";
+  if ((ins & 0x7) == 0) {
+    return JUMP_NONE;
+  }
+
+  if ((ins & 0x7) == 0x7) {
+    return "jmp";
+  }
+
+  bool jl = (ins & (1 << 2)) != 0;
+  bool je = (ins & (1 << 1)) != 0;
+  bool jg = (ins & (1 << 0)) != 0;
+
+  if (jl && je) {
+    return "jle";
+  }
+  if (jl && jg) {
+    return "jne";
+  }
+  if (je && jg) {
+    return "jge";
+  }
+
+  if (jl)
+    return "jlt";
+  if (je)
+    return "jeq";
+  if (jg)
+    return "jgt";
+
+  return "<unknown>";
 }
 
 static std::pair<std::string, bool> decode_ins(uint16_t ins) {
-    int opcode = (ins >> 8) & 0x03;
-    bool ar_n_log = (ins & (1 << 10)) != 0;
-    opcode |= (ar_n_log ? 1 : 0) << 2;
-
-    switch (opcode) {
-        case 0b000: return {"and", true};
-        case 0b001: return {"or",  true};
-        case 0b010: return {"xor", true};
-        case 0b011: return {"not", false};
-        case 0b100: return {"add", true};
-        case 0b101: return {"inc", false};
-        case 0b110: return {"sub", true};
-        case 0b111: return {"dec", false};
-        default:    return {"<?>", false};
-    }
+  int opcode = (ins >> 8) & 0x03;
+  bool ar_n_log = (ins & (1 << 10)) != 0;
+  opcode |= (ar_n_log ? 1 : 0) << 2;
+
+  switch (opcode) {
+  case 0b000:
+    return {"and", true};
+  case 0b001:
+    return {"or", true};
+  case 0b010:
+    return {"xor", true};
+  case 0b011:
+    return {"not", false};
+  case 0b100:
+    return {"add", true};
+  case 0b101:
+    return {"inc", false};
+  case 0b110:
+    return {"sub", true};
+  case 0b111:
+    return {"dec", false};
+  default:
+    return {"<?>", false};
+  }
 }
 
 static std::string decode_arg1(uint16_t ins) {
-    bool use_mem = (ins & (1 << 12)) != 0;
-    bool zx      = (ins & (1 << 7))  != 0;
-    bool sw      = (ins & (1 << 6))  != 0;
-
-    if (zx) return ZERO;
-    if (!sw) return "D";
-    return use_mem ? "M" : "A";
+  bool use_mem = (ins & (1 << 12)) != 0;
+  bool zx = (ins & (1 << 7)) != 0;
+  bool sw = (ins & (1 << 6)) != 0;
+
+  if (zx)
+    return ZERO;
+  if (!sw)
+    return "D";
+  return use_mem ? "M" : "A";
 }
 
 static std::string decode_arg2(uint16_t ins) {
-    bool use_mem = (ins & (1 << 12)) != 0;
-    bool sw      = (ins & (1 << 6))  != 0;
+  bool use_mem = (ins & (1 << 12)) != 0;
+  bool sw = (ins & (1 << 6)) != 0;
 
-    if (sw) return "D";
-    return use_mem ? "M" : "A";
+  if (sw)
+    return "D";
+  return use_mem ? "M" : "A";
 }
 
 static std::string decode_dest(uint16_t ins) {
-    bool dA = (ins & (1 << 5)) != 0;
-    bool dD = (ins & (1 << 4)) != 0;
-    bool dM = (ins & (1 << 3)) != 0;
-
-    std::string dest;
-    if (dA) dest += "A";
-    if (dD) dest += "D";
-    if (dM) dest += "M";
-
-    return dest.empty() ? DEST_NONE : dest;
+  bool dA = (ins & (1 << 5)) != 0;
+  bool dD = (ins & (1 << 4)) != 0;
+  bool dM = (ins & (1 << 3)) != 0;
+
+  std::string dest;
+  if (dA)
+    dest += "A";
+  if (dD)
+    dest += "D";
+  if (dM)
+    dest += "M";
+
+  return dest.empty() ? DEST_NONE : dest;
 }
 
 static Decoded decode_instruction(uint16_t ins) {
-    if ((ins & 0x8000) == 0) {
-        return {"mov", "A", "#" + std::to_string(ins), "", ""};
-    } else {
-        auto [mnemonic, two_op] = decode_ins(ins);
-        std::string dest    = decode_dest(ins);
-        std::string op1     = decode_arg1(ins);
-        std::string op2     = two_op ? decode_arg2(ins) : "";
-        std::string jumpdst = decode_jump(ins);
-        return {mnemonic, dest, op1, op2, jumpdst};
-    }
+  if ((ins & 0x8000) == 0) {
+    return {"mov", "A", "#" + std::to_string(ins), "", ""};
+  } else {
+    auto [mnemonic, two_op] = decode_ins(ins);
+    std::string dest = decode_dest(ins);
+    std::string op1 = decode_arg1(ins);
+    std::string op2 = two_op ? decode_arg2(ins) : "";
+    std::string jumpdst = decode_jump(ins);
+    return {mnemonic, dest, op1, op2, jumpdst};
+  }
 }
 
 static Decoded fixup_ins(uint16_t ins) {
-    Decoded d = decode_instruction(ins);
-    std::string &mnemonic = d.mnemonic;
-    std::string &dest     = d.dest;
-    std::string &op1      = d.op1;
-    std::string &op2      = d.op2;
-    std::string &jumpdest = d.jumpdest;
-
-    if (op1 == ZERO) {
-        if (mnemonic == "sub") {
-            return {"neg", dest, op2, "", jumpdest};
-        }
+  Decoded d = decode_instruction(ins);
+  std::string &mnemonic = d.mnemonic;
+  std::string &dest = d.dest;
+  std::string &op1 = d.op1;
+  std::string &op2 = d.op2;
+  std::string &jumpdest = d.jumpdest;
+
+  if (op1 == ZERO) {
+    if (mnemonic == "sub") {
+      return {"neg", dest, op2, "", jumpdest};
+    }
 
-        if (mnemonic == "and") {
-            if (dest == DEST_NONE) {
-                if (in_list(jumpdest, JUMPS_IF_ZERO)) {
-                    return {"jmp", "", "", "", ""};
-                } else {
-                    return {"nop", "", "", "", ""};
-                }
-            } else {
-                std::string newjmp = in_list(jumpdest, JUMPS_IF_ZERO) ? "jmp" : "";
-                return {"mov", dest, ZERO, "", newjmp};
-            }
+    if (mnemonic == "and") {
+      if (dest == DEST_NONE) {
+        if (in_list(jumpdest, JUMPS_IF_ZERO)) {
+          return {"jmp", "", "", "", ""};
+        } else {
+          return {"nop", "", "", "", ""};
         }
+      } else {
+        std::string newjmp = in_list(jumpdest, JUMPS_IF_ZERO) ? "jmp" : "";
+        return {"mov", dest, ZERO, "", newjmp};
+      }
+    }
 
-        if (mnemonic == "add" || mnemonic == "or" || mnemonic == "xor") {
-            if (dest == DEST_NONE && jumpdest == JUMP_NONE) {
-                return {"nop", "", "", "", ""};
-            } else {
-                return {"mov", dest, op2, "", jumpdest};
-            }
-        }
+    if (mnemonic == "add" || mnemonic == "or" || mnemonic == "xor") {
+      if (dest == DEST_NONE && jumpdest == JUMP_NONE) {
+        return {"nop", "", "", "", ""};
+      } else {
+        return {"mov", dest, op2, "", jumpdest};
+      }
+    }
 
-        if (mnemonic == "not") {
-            if (dest == DEST_NONE) {
-                if (jumpdest == "jeq" || jumpdest == "jgt" ||
-                    jumpdest == "jge" || jumpdest == JUMP_NONE) {
-                    return {"nop", "", "", "", ""};
-                } else {
-                    return {"jmp", "", "", "", ""};
-                }
-            }
+    if (mnemonic == "not") {
+      if (dest == DEST_NONE) {
+        if (jumpdest == "jeq" || jumpdest == "jgt" || jumpdest == "jge" ||
+            jumpdest == JUMP_NONE) {
+          return {"nop", "", "", "", ""};
+        } else {
+          return {"jmp", "", "", "", ""};
         }
+      }
     }
+  }
 
-    return d;
+  return d;
 }
 
 std::string print_decoded(uint16_t ins, bool simplify) {
-    // illegal instruction
-    if ((ins & 0xC000) == 0x8000)
-        return "halt";
-
-    Decoded d = simplify ? fixup_ins(ins) : decode_instruction(ins);
-
-    std::string jumpdest_str = d.jumpdest.empty() ? "" : "." + d.jumpdest;
-    std::string opcode_str   = d.mnemonic + jumpdest_str;
-    std::string dest_str     = d.dest.empty() ? std::string(7, ' ')
-                                              : d.dest + ", ";
-    std::string op2_str      = d.op2.empty() ? "" : ", ";
-    std::string op1_str      = d.op1 + op2_str;
-
-    std::ostringstream oss;
-    oss << std::left << std::setw(9) << opcode_str
-        << std::setw(6) << dest_str
-        << std::setw(4) << op1_str
-        << d.op2;
-
-    return oss.str();
+  // illegal instruction
+  if ((ins & 0xC000) == 0x8000)
+    return "halt";
+
+  Decoded d = simplify ? fixup_ins(ins) : decode_instruction(ins);
+
+  std::string jumpdest_str = d.jumpdest.empty() ? "" : "." + d.jumpdest;
+  std::string opcode_str = d.mnemonic + jumpdest_str;
+  std::string dest_str = d.dest.empty() ? std::string(7, ' ') : d.dest + ", ";
+  std::string op2_str = d.op2.empty() ? "" : ", ";
+  std::string op1_str = d.op1 + op2_str;
+
+  std::ostringstream oss;
+  oss << std::left << std::setw(9) << opcode_str << std::setw(6) << dest_str
+      << std::setw(4) << op1_str << d.op2;
+
+  return oss.str();
 }
diff --git a/nandgame/cpp/disas.h b/nandgame/cpp/disas.h
index 1f04268..d075fce 100644
--- a/nandgame/cpp/disas.h
+++ b/nandgame/cpp/disas.h
@@ -1,4 +1,6 @@
-#include <string>
+#pragma once
+
 #include <cstdint>
+#include <string>
 
 std::string print_decoded(uint16_t ins, bool simplify);
diff --git a/nandgame/cpp/simpc_config.h b/nandgame/cpp/simpc_config.h
new file mode 100644
index 0000000..6e35517
--- /dev/null
+++ b/nandgame/cpp/simpc_config.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#define TICKS_PER_INS 2
diff --git a/nandgame/cpp/simpc_types.h b/nandgame/cpp/simpc_types.h
new file mode 100644
index 0000000..5fc7076
--- /dev/null
+++ b/nandgame/cpp/simpc_types.h
@@ -0,0 +1,3 @@
+#pragma once
+
+enum class StepPosition_t { BEFORE_EVAL, AFTER_EVAL };
diff --git a/nandgame/cpp/simpc_ui.cpp b/nandgame/cpp/simpc_ui.cpp
new file mode 100644
index 0000000..2fce3b8
--- /dev/null
+++ b/nandgame/cpp/simpc_ui.cpp
@@ -0,0 +1,100 @@
+#include "simpc_ui.h"
+
+#define NCUR 1
+#include "disas.h"
+
+#define NCUR_OFFSET 3
+
+#if NCUR
+#include <ncurses.h>
+#define NCUR_DELAY_MS 100
+#define NCUR_X 5
+
+#define PRINT_ME(x, y, ...)                                                    \
+  { mvprintw(x, y, __VA_ARGS__); }
+#define PRINT_NEXT()                                                           \
+  {                                                                            \
+    refresh();                                                                 \
+    napms(NCUR_DELAY_MS);                                                      \
+  }
+
+#else
+
+#define PRINT_ME(x, y, ...)                                                    \
+  {                                                                            \
+    printf("%*s", x, "");                                                      \
+    printf(__VA_ARGS__);                                                       \
+    printf("\n");                                                              \
+  }
+#define PRINT_NEXT()                                                           \
+  { puts("-----"); }
+
+#endif
+
+#include "Vcomputer.h"
+#include "Vcomputer___024root.h"
+#include "Vcomputer_alu.h"
+#include "Vcomputer_computer.h"
+#include "Vcomputer_instruction_decode.h"
+#include "verilated.h"
+#include <cinttypes>
+#include <cstdint>
+#include <cstdio>
+#include <sched.h>
+
+void draw_ui(const std::unique_ptr<Vcomputer> &topp, int &i,
+             StepPosition_t sp) {
+  uint16_t opcode = topp->computer->PC_content_int;
+
+  PRINT_ME(1, 1, "Step: %10d \b%c", i,
+           sp == StepPosition_t::BEFORE_EVAL ? 'A' : 'B');
+  PRINT_ME(1 + NCUR_OFFSET, NCUR_X,
+           "CLK1: %4d\tPC: @0x%04X\tINS: 0x%04X\tHLT: %d", topp->clk_in,
+           // wrong
+           // topp->computer->clk_in,
+           topp->computer->PC_addr_int, opcode, topp->halt);
+
+  auto insline = print_decoded(opcode, true);
+  PRINT_ME(3 + NCUR_OFFSET, NCUR_X, "%-80s", insline.c_str());
+
+  // keep old state
+  if (topp->halt)
+    return;
+
+  PRINT_ME(5 + NCUR_OFFSET, NCUR_X,
+           "A: 0x%04X\tD: 0x%04X\tM: 0x%04X\tRES: 0x%04X",
+           topp->computer->reg_A_int, topp->computer->reg_D_int,
+           topp->computer->reg_pA_int, topp->computer->result_int);
+  PRINT_ME(6 + NCUR_OFFSET, NCUR_X,
+           "%9" PRId16 "\t%9" PRId16 "\t%9" PRId16 "\t%11" PRId16,
+           topp->computer->reg_A_int, topp->computer->reg_D_int,
+           topp->computer->reg_pA_int, topp->computer->result_int);
+  PRINT_ME(7 + NCUR_OFFSET, NCUR_X, "ALU");
+  PRINT_ME(8 + NCUR_OFFSET, NCUR_X, "X: %5" PRId16 "\tY: %5" PRId16,
+           topp->computer->CPU->my_alu->int_op_x,
+           topp->computer->CPU->my_alu->int_op_y)
+
+  PRINT_NEXT();
+}
+
+void draw_finish(const std::unique_ptr<VerilatedContext> &contextp,
+                 const std::unique_ptr<Vcomputer> &topp) {
+#if NCUR
+  refresh();
+#endif
+  PRINT_ME(10 + NCUR_OFFSET, 10, "Simulation finished.");
+  if (topp->halt) {
+    PRINT_ME(11 + NCUR_OFFSET, 10, "Halt encountered.");
+  } else if (!contextp->gotFinish()) {
+    PRINT_ME(11 + NCUR_OFFSET, 10, "Step count exceeded.");
+  } else {
+    PRINT_ME(11 + NCUR_OFFSET, 10, "Regular finish.");
+  }
+}
+
+void draw_init(void) {
+#if NCUR
+  initscr();
+  curs_set(0);
+#endif
+}
diff --git a/nandgame/cpp/simpc_ui.h b/nandgame/cpp/simpc_ui.h
new file mode 100644
index 0000000..4f03d4a
--- /dev/null
+++ b/nandgame/cpp/simpc_ui.h
@@ -0,0 +1,11 @@
+#pragma once
+
+#include "Vcomputer.h"
+#include "simpc_types.h"
+
+#include <memory>
+
+void draw_init(void);
+void draw_ui(const std::unique_ptr<Vcomputer> &topp, int &i, StepPosition_t sp);
+void draw_finish(const std::unique_ptr<VerilatedContext> &contextp,
+                 const std::unique_ptr<Vcomputer> &topp);
\ No newline at end of file