Issue with serial communication

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theMainframer
Posts: 2
Joined: 29 Dec 2018, 04:13

Issue with serial communication

Post by theMainframer »

My Gigatron has an issue where the left arrow does not work on both the controller and the keyboard. Also, when I tested the keyboard many of the keys did not output their corresponding letter and some were even duplicates (I have two keys that output '7' for example). I checked for bad soldering, but I did not see any obvious problems. What are your opinions for what could be causing this?
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marcelk
Posts: 488
Joined: 13 May 2018, 08:26

Re: Issue with serial communication

Post by marcelk »

This would be the connection of the shift register U39 pin 1 to the data bus. It can be checked with a multimeter. For example verify that this pin makes a connection to U10 pin 9.

Game controller buttons to bus
Game controller buttons to bus
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theMainframer
Posts: 2
Joined: 29 Dec 2018, 04:13

Re: Issue with serial communication

Post by theMainframer »

Thank you, that solved the problem.
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