I’m back on the dead Zenith ZT-1 — time to get to the bottom of exactly what’s wrong with this modem "terminal."
Part 1: https://www.youtube.com/watch?v=5VLS-vUDV1I
Part 2: This part!
Part 3: Coming soon
0:00 Info
1:02 Media coverage about the ZT-1
11:45 Overview of the design
15:38 Fixing the dead PSU
21:51 First power up (again)
25:37 Analyzing ROM code
51:22 Signs of life
— 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
Sextant Issue 202:
https://ia802907.us.archive.org/10/items/sextantissue2summer1982/Sextant%20Issue%202%20Summer%201982.pdf
Heathkit Fall Catalog:
https://www.worldradiohistory.com/Archive-Catalogs/Heathkit-Catalogs/Heathkit-1983-Fall.pdf
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
