Allison wrote: True, but the latch that outputs the 3 bits for the 7447 has a fourth output which could be used! Take that 4th output to the 7447 'D' input (which is now connected to GND) and you can display an "8" or a "9". But I am drifting off-topic -- the console must work for starters :-) - Henk, PA8PDP. This message and attachment(s) are intended solely for the use of the addressee and may contain information that is privileged, confidential or otherwise exempt from disclosure under applicable law. If you are not the intended recipient or agent thereof responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you have received this communication in error, please notify the sender immediately by telephone and with a "reply" message. Thank you for your cooperation.