diff --git a/src/utils/em8080.c b/src/utils/em8080.c
new file mode 100644
index 0000000..3024623
--- /dev/null
+++ b/src/utils/em8080.c
@@ -0,0 +1,428 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdlib.h>
+
+uint8_t mem[64*1024];
+
+typedef struct flagbits {
+  unsigned int c : 1;
+  unsigned int u1 : 1;
+  unsigned int p : 1;
+  unsigned int u3 : 1;
+
+  unsigned int a : 1;
+  unsigned int u5 : 1;
+  unsigned int z : 1;
+  unsigned int s : 1;
+} flagbits;
+
+typedef struct reg {
+  uint8_t flags;
+  uint8_t a;
+  uint8_t c;
+  uint8_t b;
+  uint8_t e;
+  uint8_t d;
+  uint8_t l;
+  uint8_t h;
+} reg;
+
+typedef struct regp {
+  uint16_t psw;
+  uint16_t bc;
+  uint16_t de;
+  uint16_t hl;
+} regp;
+
+union regset {
+  struct reg reg;
+  struct regp regp;
+} regset;
+
+#define A regset.reg.a
+#define B regset.reg.b
+#define C regset.reg.c
+#define D regset.reg.d
+#define E regset.reg.e
+#define H regset.reg.h
+#define L regset.reg.l
+#define M mem[HL]
+
+#define BC regset.regp.bc
+#define DE regset.regp.de
+#define HL regset.regp.hl
+
+#define flags (*(struct flagbits*)&regset.reg.flags)
+
+uint16_t IP = 0x100;
+uint16_t SP = 0;
+unsigned int tmp;
+
+// Dump registers
+void dump() {
+  printf("\n");
+  printf("A=%02X BC=%04X DE=%04X HL=%04X M=%02X SP=%04X ", A, BC, DE, HL, M, SP);
+  printf("%c", flags.s ? 'S' : '-');
+  printf("%c", flags.z ? 'Z' : '-');
+  printf("%c", flags.a ? 'A' : '-');
+  printf("%c", flags.p ? 'P' : '-');
+  printf("%c", flags.c ? 'C' : '-');
+
+  printf("\n");
+  printf("IP=%04X : %02X %02X\n", IP, mem[IP], mem[IP+1]);
+}
+
+uint8_t imm8() {
+  uint8_t r = *(uint8_t*)&mem[IP];
+  IP++;
+  return r;
+}
+
+uint16_t imm16() {
+  uint16_t r = *(uint16_t*)&mem[IP];
+  IP+=2;
+  return r;
+}
+
+void push(uint16_t v) {
+  SP -= 2;
+  *(uint16_t*)&mem[SP] = v;
+}
+
+uint16_t pop() {
+  uint16_t v = *(uint16_t*)&mem[SP];
+  SP += 2;
+  return v;
+}
+
+int has_even_parity(uint8_t x){
+  unsigned int count = 0, i, b = 1;
+
+  for(i = 0; i < 8; i++){
+      if( x & (b << i) ){count++;}
+  }
+
+  if( (count % 2) ){return 0;}
+  return 1;
+}
+
+void cpm_syscall(int number) {
+  switch(number) {
+  case 0:
+    exit(0);
+    break;
+  case 2:
+    printf("%c", E);
+    break;
+  default:
+    fprintf(stderr, "Fatal: Unhandled CP/M syscall %Xh\n", number);
+    exit(1);
+  }
+}
+void handle_intr(int number) {
+  switch(number) {
+  default:
+    fprintf(stderr, "Fatal: Unhandled interrupt %Xh\n", number);
+    exit(1);
+  }
+}
+
+#define add16c(a, b) \
+  tmp = a + b; \
+  flags.c = (tmp >> 16) & 1
+
+#define unarync(a, op) \
+  tmp=a; \
+  tmp op; \
+  flags.p = has_even_parity(tmp & 8); \
+  flags.z = !(tmp); \
+  flags.s = (tmp >> 7) & 1; \
+  a=tmp
+
+#define aritht(a, op, b) \
+  tmp=a; \
+  tmp=a op b; \
+  flags.c = (tmp >> 8) & 1; \
+  flags.p = has_even_parity(tmp & 8); \
+  flags.z = !(tmp); \
+  flags.s = (tmp >> 7) & 1;
+
+#define arith(a, op, b) \
+  aritht(a, op, b); \
+  a=tmp
+
+// Execute a single instruction
+void step() {
+  uint8_t opcode = mem[IP];
+  IP++;
+  switch(opcode) {
+  case 0x00: break;;
+  case 0x01: BC=imm16(); break;;
+  case 0x02: mem[BC]=A; break;;
+  case 0x03: BC++;
+  case 0x04: unarync(B, ++); break;;
+  case 0x05: unarync(B, --); break;;
+  case 0x06: B=imm8(); break;;
+
+  case 0x09: HL=add16c(HL,BC); break;;
+  case 0x0a: A=mem[BC]; break;;
+  case 0x0b: BC--;
+  case 0x0c: unarync(B, ++); break;;
+  case 0x0d: unarync(B, --); break;;
+  case 0x0e: C=imm8(); break;;
+
+  case 0x11: DE=imm16(); break;;
+  case 0x12: mem[DE]=A; break;;
+  case 0x13: DE++;
+  case 0x14: unarync(D, ++); break;;
+  case 0x15: unarync(D, --); break;;
+  case 0x16: D=imm8(); break;;
+
+  case 0x19: HL=add16c(HL,DE); break;;
+  case 0x1a: A=mem[DE]; break;;
+  case 0x1b: DE--;
+  case 0x1c: unarync(E, ++); break;;
+  case 0x1d: unarync(E, --); break;;
+  case 0x1e: E=imm8(); break;;
+
+  case 0x21: HL=imm16(); break;;
+  case 0x22: *(uint16_t*)&mem[imm16()]=HL; break;;
+  case 0x23: HL++;
+  case 0x24: unarync(H, ++); break;;
+  case 0x25: unarync(H, --); break;;
+  case 0x26: H=imm8(); break;;
+
+  case 0x29: HL=add16c(HL,HL); break;;
+  case 0x2a: HL=*(uint16_t*)&mem[imm16()]; break;;
+  case 0x2b: HL--;
+  case 0x2c: unarync(L, ++); break;;
+  case 0x2d: unarync(L, --); break;;
+  case 0x2e: L=imm8(); break;;
+  case 0x2f: A=~A; break;;
+
+  case 0x31: SP=imm16(); break;;
+  case 0x32: mem[imm16()]=A; break;;
+  case 0x33: SP++;
+  case 0x34: unarync(M, ++); break;;
+  case 0x35: unarync(M, --); break;;
+  case 0x36: M=imm8(); break;;
+  case 0x37: flags.c = 1; break;;
+
+  case 0x39: HL=add16c(HL,SP); break;;
+  case 0x3a: A=mem[imm16()]; break;;
+  case 0x3b: SP--;
+  case 0x3c: unarync(A, ++); break;;
+  case 0x3d: unarync(A, --); break;;
+  case 0x3e: A=imm8(); break;;
+  case 0x3f: flags.c = !flags.c; break;;
+
+  case 0x40: B=B; break;;
+  case 0x41: B=C; break;;
+  case 0x42: B=D; break;;
+  case 0x43: B=E; break;;
+  case 0x44: B=H; break;;
+  case 0x45: B=L; break;;
+  case 0x46: B=M; break;;
+  case 0x47: B=A; break;;
+
+  case 0x48: C=B; break;;
+  case 0x49: C=C; break;;
+  case 0x4a: C=D; break;;
+  case 0x4b: C=E; break;;
+  case 0x4c: C=H; break;;
+  case 0x4d: C=L; break;;
+  case 0x4e: C=M; break;;
+  case 0x4f: C=A; break;;
+
+  case 0x50: D=B; break;;
+  case 0x51: D=C; break;;
+  case 0x52: D=D; break;;
+  case 0x53: D=E; break;;
+  case 0x54: D=H; break;;
+  case 0x55: D=L; break;;
+  case 0x56: D=M; break;;
+  case 0x57: D=A; break;;
+
+  case 0x58: E=B; break;;
+  case 0x59: E=C; break;;
+  case 0x5a: E=D; break;;
+  case 0x5b: E=E; break;;
+  case 0x5c: E=H; break;;
+  case 0x5d: E=L; break;;
+  case 0x5e: E=M; break;;
+  case 0x5f: E=A; break;;
+
+  case 0x60: H=B; break;;
+  case 0x61: H=C; break;;
+  case 0x62: H=D; break;;
+  case 0x63: H=E; break;;
+  case 0x64: H=H; break;;
+  case 0x65: H=L; break;;
+  case 0x66: H=M; break;;
+  case 0x67: H=A; break;;
+
+  case 0x68: L=B; break;;
+  case 0x69: L=C; break;;
+  case 0x6a: L=D; break;;
+  case 0x6b: L=E; break;;
+  case 0x6c: L=H; break;;
+  case 0x6d: L=L; break;;
+  case 0x6e: L=M; break;;
+  case 0x6f: L=A; break;;
+
+  case 0x70: M=B; break;;
+  case 0x71: M=C; break;;
+  case 0x72: M=D; break;;
+  case 0x73: M=E; break;;
+  case 0x74: M=H; break;;
+  case 0x75: M=L; break;;
+  case 0x76: exit(0); break;;
+  case 0x77: M=A; break;;
+
+  case 0x78: A=B; break;;
+  case 0x79: A=C; break;;
+  case 0x7a: A=D; break;;
+  case 0x7b: A=E; break;;
+  case 0x7c: A=H; break;;
+  case 0x7d: A=L; break;;
+  case 0x7e: A=M; break;;
+  case 0x7f: A=A; break;;
+
+  case 0x80: arith(A, +, B); break;;
+  case 0x81: arith(A, +, C); break;;
+  case 0x82: arith(A, +, D); break;;
+  case 0x83: arith(A, +, E); break;;
+  case 0x84: arith(A, +, H); break;;
+  case 0x85: arith(A, +, L); break;;
+  case 0x86: arith(A, +, M); break;;
+  case 0x87: arith(A, +, A); break;;
+
+  case 0x88: arith(A, +flags.c+, B); break;;
+  case 0x89: arith(A, +flags.c+, C); break;;
+  case 0x8A: arith(A, +flags.c+, D); break;;
+  case 0x8B: arith(A, +flags.c+, E); break;;
+  case 0x8C: arith(A, +flags.c+, H); break;;
+  case 0x8D: arith(A, +flags.c+, L); break;;
+  case 0x8E: arith(A, +flags.c+, M); break;;
+  case 0x8F: arith(A, +flags.c+, A); break;;
+
+  case 0x90: arith(A, -, B); break;;
+  case 0x91: arith(A, -, C); break;;
+  case 0x92: arith(A, -, D); break;;
+  case 0x93: arith(A, -, E); break;;
+  case 0x94: arith(A, -, H); break;;
+  case 0x95: arith(A, -, L); break;;
+  case 0x96: arith(A, -, M); break;;
+  case 0x97: arith(A, -, A); break;;
+
+  case 0x98: arith(A, -flags.c-, B); break;;
+  case 0x99: arith(A, -flags.c-, C); break;;
+  case 0x9A: arith(A, -flags.c-, D); break;;
+  case 0x9B: arith(A, -flags.c-, E); break;;
+  case 0x9C: arith(A, -flags.c-, H); break;;
+  case 0x9D: arith(A, -flags.c-, L); break;;
+  case 0x9E: arith(A, -flags.c-, M); break;;
+  case 0x9F: arith(A, -flags.c-, A); break;;
+
+  case 0xA0: arith(A, &, B); break;;
+  case 0xA1: arith(A, &, C); break;;
+  case 0xA2: arith(A, &, D); break;;
+  case 0xA3: arith(A, &, E); break;;
+  case 0xA4: arith(A, &, H); break;;
+  case 0xA5: arith(A, &, L); break;;
+  case 0xA6: arith(A, &, M); break;;
+  case 0xA7: arith(A, &, A); break;;
+
+  case 0xA8: arith(A, ^, B); break;;
+  case 0xA9: arith(A, ^, C); break;;
+  case 0xAA: arith(A, ^, D); break;;
+  case 0xAB: arith(A, ^, E); break;;
+  case 0xAC: arith(A, ^, H); break;;
+  case 0xAD: arith(A, ^, L); break;;
+  case 0xAE: arith(A, ^, M); break;;
+  case 0xAF: arith(A, ^, A); break;;
+
+  case 0xB0: arith(A, |, B); break;;
+  case 0xB1: arith(A, |, C); break;;
+  case 0xB2: arith(A, |, D); break;;
+  case 0xB3: arith(A, |, E); break;;
+  case 0xB4: arith(A, |, H); break;;
+  case 0xB5: arith(A, |, L); break;;
+  case 0xB6: arith(A, |, M); break;;
+  case 0xB7: arith(A, |, A); break;;
+
+  case 0xB8: aritht(A, -, B); break;;
+  case 0xB9: aritht(A, -, C); break;;
+  case 0xBA: aritht(A, -, D); break;;
+  case 0xBB: aritht(A, -, E); break;;
+  case 0xBC: aritht(A, -, H); break;;
+  case 0xBD: aritht(A, -, L); break;;
+  case 0xBE: aritht(A, -, M); break;;
+  case 0xBF: aritht(A, -, A); break;;
+
+  default:
+    IP--;
+    dump();
+    fprintf(stderr, "Invalid opcode at IP=%04X\n", IP);
+    exit(1);
+    break;
+  }
+}
+
+void copy_cmdline(char* str) {
+  int i, c;
+  uint8_t *len = &mem[0x80];
+  char* ptr = (char*)&mem[0x81];
+  c = strlen(str);
+  // Clip at max length
+  if (c>0x7E) {
+    fprintf(stderr, "Command line too long, max is 126 bytes\n");
+    exit(1);
+  }
+  memcpy(ptr, str, c);
+  ptr[c]=0x0D;
+  *len=c;
+}
+
+int main(int argc, char** argv) {
+  memset(&mem, sizeof(mem), 0);
+  // Prepare default exit into int 20h
+  mem[0]=0x76;
+  push(0);
+
+  argc--;
+  argv++;
+
+  while(argc && argv[0][0]=='-') {
+    switch(argv[0][1]) {
+    default:
+      fprintf(stderr, "Unknown option %s\n", argv[0]);
+      exit(1);
+      break;
+    }
+    argc--;
+    argv++;
+  }
+
+  if (argc) {
+    FILE* fd = fopen(argv[0], "r");
+    fread(mem + IP, 1, sizeof(mem) - IP, fd);
+    argc--;
+    argv++;
+  } else {
+    fprintf(stderr, "No COM file specified\n");
+    exit(1);
+  }
+
+  if (argc) {
+    copy_cmdline(argv[0]);
+  } else {
+    copy_cmdline("");
+  }
+
+  while(1) {
+    dump();
+    step();
+  }
+}