Uploaded March 2023 | Updated September 2026, 3 weeks ago

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Part three in my quest for 8 MB of RAM on my Radio Shack TRS-80 Model 16B! In this video, I install the SRAM-specific GAL on the 68000 board and test out the SRAM board by itself, configured for 1 MB of RAM. As usual, it doesn't work right the first time. Or the second. But I previal in th end!

Music (in order)
None – just me prattling on endlessly.

Chapters:

Intro / A Look At The Cards (0:00)
Installation / Test I (1:46)
GAL Issue and 68000 Memory Diagnostics (3:22)
Stacked Socket Removal (6:39)
Test II - Failure Revisited (8:00)
Test III - Success! 68000 Diagnostics and XENIX (9:48)
Discussion - What Went Wrong (11:40)
Where We Are / What's Next / Outro (13:56)

I do these videos unscripted, so I apologize if the in-the-moment descriptions of things are a bit scattered. If you have any questions/comments about this video, you can find me in any of these fine locations:

The Tandy Discord Server
The CoCo Nation Discord Server
The TRS-80 Color Computer (CoCo) group on Facebook
The CoCo Crew Podcast group on Facebook
On the Vintage Computer Forums (vcfed.org)
The TRS-80 Models I-4/4P Group on Facebook
Tandy / Radio Shack Model II /12 / 16 / 16B / 6000 Owner's Group on Facebook
Twitter (I'm TJBChris there...)
The Level29 BBS (I'm TJBChris there, too.)
Particles BBS (Guess who I am here? Yeah, TJBChris.)

Thanks for watching!