diff --git a/ecsim b/ecsim
index f735f20..0af66f9 160000
--- a/ecsim
+++ b/ecsim
@@ -1 +1 @@
-Subproject commit f735f202a66f903dd571276fc67b8a679dd3ddae
+Subproject commit 0af66f969924e2986edbb47c5e2f29fbfbf1ddd1
diff --git a/src/main.c b/src/main.c
index e62ad0e..0f45cd4 100644
--- a/src/main.c
+++ b/src/main.c
@@ -72,14 +72,63 @@ void kbc_event(struct Kbc * kbc) {
     }
 }
 
+enum PmcState {
+    PMC_STATE_DEFAULT,
+    PMC_STATE_ACPI_READ,
+    PMC_STATE_ACPI_WRITE,
+    PMC_STATE_ACPI_WRITE_ADDR,
+};
+
 void pmc_event(struct Pmc * pmc) {
+    static enum PmcState state = PMC_STATE_DEFAULT;
+    static uint8_t state_data[2] = {0, 0};
+
     uint8_t sts = pmc_status(pmc);
     if (sts & PMC_STS_IBF) {
         uint8_t data = pmc_read(pmc);
         if (sts & PMC_STS_CMD) {
-            printf("PMC command: %X\n", data);
+            printf("PMC command: %02X\n", data);
+
+            switch (data) {
+            case 0x80:
+                state = PMC_STATE_ACPI_READ;
+                printf("  ACPI read\n");
+                break;
+            case 0x81:
+                state = PMC_STATE_ACPI_WRITE;
+                printf("  ACPI write\n");
+                break;
+            default:
+                state = PMC_STATE_DEFAULT;
+                printf("  Unknown command\n");
+                break;
+            }
         } else {
-            printf("PMC data: %X\n", data);
+            printf("PMC data: %02X\n", data);
+
+            switch (state) {
+            case PMC_STATE_ACPI_READ:
+                state = PMC_STATE_DEFAULT;
+                //TODO - read value
+                uint8_t value = 0;
+                pmc_write(pmc, value);
+                printf("  ACPI read %02X = %02X\n", data, value);
+                break;
+            case PMC_STATE_ACPI_WRITE:
+                state = PMC_STATE_ACPI_WRITE_ADDR;
+                state_data[0] = data;
+                printf("  ACPI write %02X\n", data);
+                break;
+            case PMC_STATE_ACPI_WRITE_ADDR:
+                state = PMC_STATE_DEFAULT;
+                //TODO - write value
+                printf("  ACPI write %02X = %02X\n", state_data[0], data);
+                break;
+            default:
+                state = PMC_STATE_DEFAULT;
+                printf("  Unknown data\n");
+                break;
+            }
         }
     }
 }