IBM 3179 EAB support

oec/terminal.py

@@ -81,3 +81,75 @@ class Terminal(Device):
     def load_control_register(self):
         """Execute a LOAD_CONTROL_REGISTER command."""
         self.execute(LoadControlRegister(self.control))
+
+def get_model(terminal_id, extended_id):
+    if extended_id is None:
+        return None
+
+    model = extended_id[2:6]
+
+    # The 3179 does return an extended ID, but it does not include the model
+    # like later terminals.
+    if model == '0000':
+        model = '3179'
+
+    return model
+
+def get_keyboard_description(terminal_id, extended_id):
+    is_3278 = extended_id is None or not int(extended_id[0:2], 16) & 0x80
+
+    if is_3278:
+        description = '3278'
+
+        id_map = {
+            0b0001: 'APL',
+            0b0010: 'TEXT',
+            0b0100: 'TYPEWRITER-PSHICO',
+            0b0101: 'APL',
+            0b0110: 'TEXT',
+            0b0111: 'APL-PSHICO',
+            0b1000: 'DATAENTRY-2',
+            0b1001: 'DATAENTRY-1',
+            0b1010: 'TYPEWRITER',
+            0b1100: 'DATAENTRY-2',
+            0b1101: 'DATAENTRY-1',
+            0b1110: 'TYPEWRITER'
+        }
+
+        if terminal_id.keyboard in id_map:
+            description += '-' + id_map[terminal_id.keyboard]
+
+        return description
+
+    id_ = int(extended_id[0:2], 16) & 0x1f
+
+    is_user = int(extended_id[0:2], 16) & 0x20
+
+    if is_user:
+        description = 'USER'
+
+        if id_ in [1, 2, 3, 4]:
+            description += f'-{id_}'
+
+        return description
+
+    is_ibm = not int(extended_id[6:8], 16) & 0x80
+
+    description = 'IBM' if is_ibm else 'UNKNOWN'
+
+    is_enhanced = int(extended_id[6:8], 16) & 0x01
+
+    if is_enhanced:
+        if id_ == 1:
+            return description + '-ENHANCED'
+
+        return None
+
+    if id_ == 1:
+        return description + '-TYPEWRITER'
+    elif id_ == 2:
+        return description + '-DATAENTRY'
+    elif id_ == 3:
+        return description + '-APL'
+
+    return None