Editing Commodore 128 (section)

== Input/Output and Expansion ==

The C128 is housed in a redesigned case with an improved keyboard including a numeric keypad and function keys<ref>{{cite web |url=https://en.wikipedia.org/wiki/Commodore_128 |title=Commodore 128 - Wikipedia |publisher=Wikipedia |date=2025-06-06 |access-date=2025-06-09}}</ref>. The keyboard features 92 keys (QWERTY/QWERTZ), which are multiple reserved, with numeric keypad<ref>{{cite web |url=https://www.c64-wiki.com/wiki/Commodore_128 |title=Commodore 128 - C64-Wiki |publisher=C64-Wiki |date=2019-10-27 |access-date=2025-06-09}}</ref>.

The C128's keyboard includes four cursor keys, Alt, Tab keys and a numeric keypad. None of these were present on the C64 which had only two cursor keys, requiring the use of the Shift key to move the cursor up or left<ref>{{cite web |url=https://en.wikipedia.org/wiki/Commodore_128 |title=Commodore 128 - Wikipedia |publisher=Wikipedia |date=2025-06-06 |access-date=2025-06-09}}</ref>.

The system includes comprehensive I/O capabilities: Game port (Control port) 1 and 2 with 9 pin Sub-D connectors for connecting joysticks, light pen, mouse or paddles; RGBI connector (9 pin, output only) for connecting an RGB or monochrome monitor in 80 char mode; Userport (RS-232 or Centronics; 24 pin; I/O), which can be used for connecting a modem or printer interface<ref>{{cite web |url=https://www.c64-wiki.com/wiki/Commodore_128 |title=Commodore 128 - C64-Wiki |publisher=C64-Wiki |date=2019-10-27 |access-date=2025-06-09}}</ref>.