Hardware checklist

Checkpoint 3.1: Industry standard ports

Provide industry standard ports for alternative input and output devices.


A user with severe mobility impairments cannot use the standard keyboard or mouse. The system needs to provide an industry standard port, so the user can attach a switch or other alternate input device to replace the keyboard. The system will regard this device as its keyboard, and the user will be able to input any valid keystroke combination available from the regular keyboard.

A blind or vision impaired user who cannot use the standard display may need to attach a hardware speech synthesis device or a Braille display. Such alternative output devices can also be attached using an industry standard port.

Required development techniques

This checkpoint applies only to desktop and portable computers.

The following techniques are the minimum required to meet Checkpoint 3.1 from the IBM Hardware Accessibility Checklist:

Required test techniques

Test the hardware to ensure that it complies with accessibility requirements.


A sound level meter.


One or more of the following techniques are required to verify this checkpoint:
Action Result


Verify the system has an industry standard port (e.g., RS-232, PCMCIA, USB), visually and by verifying specifications.




If the system supports attaching an external display, verify there is a standard display connector, visually and by verifying specifications.




When a system provides auditory output, verify that the audio signal is provided at a standard signal level, through a standard connection. Check the output of the auditory channel output with a sound level meter.



©2009 IBM Corporation

Last updated on July 22, 2009.