diff --git a/zx_disk.cpp b/zx_disk.cpp
index fe589c6..005f254 100644
--- a/zx_disk.cpp
+++ b/zx_disk.cpp
@@ -74,12 +74,14 @@ namespace zx_disk
 
     uint8_t ST0()
     {
-        return current_drive | (current_head<<2) | (seeking ? 0x20 : 0x00) | (fdd0busy ? 0x00 : 0x40);
+        return current_drive | (current_head<<2) | (seeking ? 0x20 : 0x00) | (fdd0busy ? 0x00 : 0x80);
     }
 
     uint8_t ST3()
     {
-        return current_drive | (current_head<<2) | 0x38; // ST3
+        const bool ready = (current_head==0) && (current_drive==0);
+        return current_drive | (current_head<<2) | ((current_track==0)?0x10:0) |
+            (ready?0x20:0) | 0x08; // TS
     }
 
     void start_command(uint8_t command);
@@ -224,6 +226,7 @@ namespace zx_disk
                 current_drive = command & 0x3;
                 call_count = 0;
                 current_track = 0;
+                seeking = true;
                 process_current_command = nullptr;
                 mode = ZX_FDC_MODE_IDLE;
                 break;