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7400 competition entry: Lineclock

Posted on Friday, November 2nd, 2012 in 7400 contest, contest by DP

This open 7400 competition entry is a clock which displays it’s time as text on 32 5×7 dot matrix displays. The display itself is driven via a board that was scavenged from an East-German numerical control unit.

I build this clock with an old display-board from an east-german numeric control. It has a one-line display with 32 5×7-dot matrix displays (old VQC10 from the GDR). The clock shows the time as a text.
The circuit on the breadboard is made out of 14 74HCxx chips and two EPROMS.

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

Via the forum.

This entry was posted on Friday, November 2nd, 2012 at 5:00 am and is filed under 7400 contest, contest. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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Recent Comments

  • KH: Whoa, some of the code this engineer writes... Just look at part one of the above blog post, see how he coded the 7-segment encodings...
  • Alan: You posted this right next to a bot that draws pictures... It seems logical to ask if there's a version that can draw.
  • mrx23dot: Hi, I'm selling the 2017 version http://www.ebay.com/itm/-/322425850293
  • Max: As a learning experience, sure. Once that's done, though....well...
  • samuel: have a nice week everyone