English: A digital clock/calendar built of TTL parts, designed in the late 1970's as a real-time clock for a process control computer. Because of the high current draw, the standby power was a 12 V 8 AH lead-acid battery. The photo shows some loose TTL chips and a well-known manufacturer's catalog of TTL parts.
I made this picture all by myself. Please Mr. Copyright Bot, don't delete it. --Wtshymanski (talk) 15:02, 3 January 2011 (UTC)
Wtshymanski, a mű szerzője művét közkinccsé nyilvánította. Ez a világ minden részén érvényes.
Egyes országokban ez jogilag nem lehetséges. Ha így van, akkor: Wtshymanski jogot ad bárkinek, hogy bármilyen célból, feltétel nélkül használhassa ezt a fájlt, kivéve a törvény által kötelezően előírt feltételeket.
{{pd}} A digital clock/calendar built of TTL parts, designed in the late 1970's as a real-time clock for a process control computer. Because of the high current draw, the standby batter was a 12 V 8 AH lead-acid cell. The photo shows some loose TTL chips