monitors that can be rectified by removing pin 7 from the plug at one end of the connecting cable. External keyboard input (DB25-connector) (C128D(CR) only) See also Commodore BASIC Commodore 64 peripherals Notes References Bibliography Greenley, Larry, et al. (1986). Commodore 128 Programmer's Reference Guide. Bantam Computer Books/Commodore Publications. . Gerits, K.; Schieb, J.; Thrun, F. (1986). Commodore 128 Internals. 2nd ed. Grand Rapids, Michigan: Abacus Software, Inc. . Original German edition (1985), Düsseldorf, West Germany: Data Becker GmbH & Co. KG. External links Commodore 128 Systems Guide Commodore 128 CP/M User's Guide VICE: Versatile Commodore Emulator Z64K: C128, C64, VIC20, and Atari 2600 emulators RUN Magazine Issue 18 June 1985 hackaday.com: Guest Post: The Real Story of Hacking Together the Commodore C128, by: Bil Herd (dated 2013-12-09) 6502-based home computers Z80-based home computers