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)
Дата
10 апреля 2005 (дата первоначальной загрузки файла на вики)
В некоторых странах это не может быть возможно юридически, в таком случае: Wtshymanski предоставляет любому право использовать данное произведение в любых целях, без каких-либо условий, если только такие условия не требуются по закону.
{{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