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Forum Index : Guest Book : VT100 ASCII Terminal Video Signal Issue

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Vampire05
Regular Member

Joined: 06/12/2020
Location: Germany
Posts: 88

Posted: 10:18am 16 Dec 2020

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Hi guys,

i need your ideas. I can not get a video signal out from my ascii terminal (vt100 emulator):

Instead of the MCP1700-330 i used the Wemos ESP32 18650 Battery Shield.
For VGA, i only connected the green signal (Pin 2) and soldered the "green" pad in the "select color" section on the pcb. I have checked connection from PIC to VGA Output-> everytbhing is fine! I testet 3 VGA Monitors but no visible Output. Same on Composite Output!

If i turn the device on, the activity led is on. On every keypress of the ps2 Keyboard the led is blinking. So i think the input part works fine.

Any Ideas of whats going on with the Video Output?

The Schematic:

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