let old driver match existing idn

qcodes/instrument_drivers/basel/sp983c.py

@@ -3,4 +3,20 @@
 Will eventually be deprecated and removed
 
 """
-from .BaselSP983c import BaselSP983c as SP983C
+from typing import Dict, Optional
+
+from .BaselSP983c import BaselSP983c
+
+
+class SP983C(BaselSP983c):
+    def get_idn(self) -> Dict[str, Optional[str]]:
+        vendor = "Physics Basel"
+        model = "SP 983(c)"
+        serial = None
+        firmware = None
+        return {
+            "vendor": vendor,
+            "model": model,
+            "serial": serial,
+            "firmware": firmware,
+        }