diff --git a/converter/ibmpc_usb/ibmpc_usb.c b/converter/ibmpc_usb/ibmpc_usb.c
index a8bf96e7b0..ce4075cc24 100644
--- a/converter/ibmpc_usb/ibmpc_usb.c
+++ b/converter/ibmpc_usb/ibmpc_usb.c
@@ -55,9 +55,6 @@ static uint16_t read_keyboard_id(void)
     uint16_t id = 0;
     int16_t  code = 0;
 
-    // temporary fix Z-150 AT should response with ID
-    if (ibmpc_protocol == IBMPC_PROTOCOL_AT_Z150) return 0xFFFD;
-
     // Disable
     //code = ibmpc_host_send(0xF5);
 
@@ -282,8 +279,6 @@ uint8_t matrix_scan(void)
                 keyboard_kind = PC_XT;
             } else if (0xFFFE == keyboard_id) {     // CodeSet2 PS/2 fails to response?
                 keyboard_kind = PC_AT;
-            } else if (0xFFFD == keyboard_id) {     // Zenith Z-150 AT
-                keyboard_kind = PC_AT_Z150;
             } else if (0x00FF == keyboard_id) {     // Mouse is not supported
                 xprintf("Mouse: not supported\n");
                 keyboard_kind = NONE;
@@ -326,9 +321,6 @@ uint8_t matrix_scan(void)
                 case PC_AT:
                     led_set(host_keyboard_leds());
                     break;
-                case PC_AT_Z150:
-                    // TODO: do not set indicators temporarily for debug
-                    break;
                 case PC_TERMINAL:
                     // Set all keys to make/break type
                     ibmpc_host_send(0xF8);
@@ -366,7 +358,6 @@ uint8_t matrix_scan(void)
                         if (process_cs1(code) == -1) state = INIT;
                         break;
                     case PC_AT:
-                    case PC_AT_Z150:
                         if (process_cs2(code) == -1) state = INIT;
                         break;
                     case PC_TERMINAL:
diff --git a/converter/ibmpc_usb/ibmpc_usb.h b/converter/ibmpc_usb/ibmpc_usb.h
index e08be6e4b1..0fb0d43243 100644
--- a/converter/ibmpc_usb/ibmpc_usb.h
+++ b/converter/ibmpc_usb/ibmpc_usb.h
@@ -1,12 +1,11 @@
 #ifndef IBMPC_USB_H
 #define IBMPC_USB_H
 
-typedef enum { NONE, PC_XT, PC_AT, PC_TERMINAL, PC_AT_Z150 } keyboard_kind_t;
+typedef enum { NONE, PC_XT, PC_AT, PC_TERMINAL } keyboard_kind_t;
 #define KEYBOARD_KIND_STR(kind) \
     (kind == PC_XT ? "XT" :   \
      kind == PC_AT ? "AT" :   \
      kind == PC_TERMINAL ? "TERMINAL" :   \
-     kind == PC_AT_Z150 ? "AT_Z150" :  \
      "NONE")