Looking any info about Videoton keyboard VDN 51521 (TYP: 52501) \ VOGONS

Looking any info about Videoton keyboard VDN 51521 (TYP: 52501)

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First post, by Tronix

Posted on 2019-06-01, 17:57

Tronix Offline

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Joined: 2015-04-26, 13:39
Location: Moscow, Russia

Hello,

Looking for keyboard pinout and protocol description, presumably from Videoton terminal:

PCB marked as "VDN-53". Three 74LS155 IC, five 74LS38

Reply 1 of 3, by Tronix

Posted on 2019-06-14, 06:29

Tronix Offline

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Rank: Member
Posts: 130
Joined: 2015-04-26, 13:39
Location: Moscow, Russia

Sketched a piece of the circuit connected to the cable... Any ideas on how to control the keyboard?

Reply 2 of 3, by Tronix

Posted on 2019-06-20, 04:30

Tronix Offline

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Rank: Member
Posts: 130
Joined: 2015-04-26, 13:39
Location: Moscow, Russia

Finaly i made it work. I made simple Parallel keyboard to USB converter based on STM32. Keyboard has very unusual English layout. To type the 'DIR' command I spend about 10 seconds 😊

Short video: https://youtu.be/N8TFsSLPhBE

Reply 3 of 3, by Predator99

Posted on 2019-06-20, 09:13

Predator99 Offline

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Rank: Oldbie
Posts: 1852
Joined: 2016-12-28, 19:09

Dont understand how this works...but good job! 😎

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