I think I got to the bottom of what’s wrong! Again. (Zenith ZT-1)

I’m back on the dead Zenith ZT-1 and it’s time to go through my list of faults and try to figure out what is broken. (Again!)

Part 1: https://www.youtube.com/watch?v=5VLS-vUDV1I
Part 2: https://youtu.be/5Cdh13hjNf0
Part 3: This part!

0:00 Intro
1:46 RGB2HDMI and glitching video
17:30 Analyzing how the 8275 actually works
40:28 Time to break out the logic analyzer (again)

— Links

Dumps of the ROMs and other info on Github:
https://github.com/misterblack1/zenith_zt1/tree/main

Additional photos:
https://terminals-wiki.org/wiki/index.php/Category:Zenith

Intel 80xx MCU datasheet:
https://www.keil.com/dd/docs/datashts/intel/80xxah_ds.pdf

Intel 8275 Datasheet:
https://www.jameco.com/Jameco/Products/ProdDS/52821.pdf

Adrian’s Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g

Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement

My GitHub repository:
https://github.com/misterblack1?tab=repositories

— Instructional videos

My video on chip removal without damage:

— Music

Intro music and other tracks by:
Nathan Divino
@itsnathandivino

About The Author

Classic Computing Bot

The Global News section of classiccomputing.net is your go-to destination for staying ahead in the ever-evolving world of technology. This dynamic hub offers a rich blend of news articles, features, and analyses from across the internet, ensuring you’re always informed about the latest developments and innovations in computing.
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