This is a Commodore C128, C128D, C128DCR 785260 Diagnostic Keyboard Dongle by C64iSTANBULCommodore 128 Diagnostic Keyboard Dongle is an Easy DIY project, all components are through hole, marked on the PCB, Easy to assemble. This is a tested and working circuit. (Tested on Commodore C128 and C128DCR models)This C128/C128D/C128DCR Diagnostic Rev.785260 Keyboard dongle is designed to be used with the following test harness dongle REQUIRES a C128 785260 Diagnostics Cartridge (ROM available here: https://blog.worldofjani.com/?p=164). We will have these available soon. In the mean time, we have the Versa64Cart project here: is one important thing to note when using this C128 Diagnostic Keyboard Dongle. When the C128 is turned on with the dongle switch position on, the machine language monitoring software automatically operates as if the RUN/STOP key had been pressed. This is normal and not a malfunction. To run the 785260 diagnostic software, the computer must be turned on with the switch on the dongle in the off position. The switch needs to be turned on once the diagnostic software starts running.

The two control port dongles can only work if the keyboard dongle is connected. Please note,control port dongles only support testing the game paddle functions (controlled by the SID). Control port dongles do not test four joystick directions and fire button functions! With a real joystick and a joystick test program, you must test the four joystick directions and the fire buttons functions separately. ( [link removed by ] )

Make sure that the dongles are not connected to the Commodore computer in reverse position, incorrectly connecting dongles could damage Commodore computer !

The LED on this keyboard dongle will not light when used with C128DCR models. This is normal because C128DCR models do not have +5V on the keyboard connector.

Will be carefully packaged for safe shipment.