Uploaded March 2023 | Updated September 2026, 3 weeks ago
How long does it take to test all 8 MB of RAM on my Radio Shack TRS-80 Model 16B? Find out in 52 short seconds! My Realistic Chronomatic 260 alarm clock serves as our timer for our test.
Music: So's Your Old Man (licensed from Digital Juice)
How long does it take to test all 8 MB of RAM on my Radio Shack TRS-80 Model 16B? Find out in 52 short seconds! My Realistic Chronomatic 260 alarm clock serves as our timer for our test.
Music: So's Your Old Man (licensed from Digital Juice)



![Top-Tier Tandy CoCo 1987-Style: Just Add A Hard Drive
What would a hard disk-enabled Color Computer 3 dream system look like in 1987? What hardware is required? How is it set up? I answer all of these questions and more with a deep dive into one of Tandys rare peripherals for the CoCo: The Tandy Color Computer Hard Disk Controller. Ill build a high-end (and expensive) CoCo system, complete with a virtual trip to Radio Shack. Then we put it all together and configure the OS-9 operating system to use the hard disk. I demonstrate OS-9 configuration and bootfile customization and software installation. I then add a DT-100 terminal for more flexibility before we finish out by removing all of the disks and starting OS-9 from a CCR-81 cassette recorder. Its a CoCo storage extravaganza!
Links:
The CoCo Nation - https://thecoconation.com/
CoCo Nation on YouTube - https://www.youtube.com/@The_CoCo_Nation
The Color Computer Archive - https://colorcomputerarchive.com/
Radio Shack Catalogs - https://radioshackcatalogs.com/
NitrOS-9 Ease-Of-Use - https://www.lcurtisboyle.com/nitros9/nitros9.html
Music/SFX (in order):
Music: Night on the Town by TrackTribe
(Taken from the YouTube Audio Library)
Scrabble Tile Drop (used repeatedly)
Kevin MacLeod - Local Elevator (multiple clips)
(Taken from the YouTube Audio Library)
Intro (0:00)
Why? Just use [MODERN_REPLACEMENTS]! (3:30)
1987 Radio Shack Shopping Spree (7:49)
Important HD Controller Info (18:24)
Putting The System Together and Cool Manuals (22:14)
Boot OS-9 / Make HD Boot Disk with CONFIG (25:29)
HD Driver Init And Format (38:27)
Long, Fun Commentary and Caveats (42:24)
Copying OS-9 Files to HD with dsave (54:16)
First Boot With HD Boot Disk / Custom startup file (59:58)
Copying The Development System to HD (1:03:39)
Multitasking With The DT-100 (1:09:04)
Reprise - Boot OS-9 From Cassette (1:13:02)
Outro / Whats Next (1:19:49)
I do these videos unscripted, so I apologize if the in-the-moment descriptions of things are a bit scattered or wordy. 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 Owners Group on Facebook
X (Im TJBChris there...)
Mastadon: TJBChris@mastadon.social
The Level29 BBS (Im TJBChris there, too.)
Particles BBS (Guess who I am here? Yeah, TJBChris.)
Thanks for watching! Top-Tier Tandy CoCo 1987-Style: Just Add A Hard Drive](https://i.ytimg.com/vi/oCZeUzvtj3g/mqdefault.jpg)



![TRS-80 Model 4 Hi-Res Graphics Upgrade
My TRS-80 Model 4 gets even better with high-resolution graphics! I install Ian Mavrics Improved Grafyx 4.2(.1) HRG board, which is his reproduction of the MicroLabs Grafyx board from the 1980s. After installation, I test some high-resolution software including Post Master, a Slot machine program, and some Graphics BASIC programs. I swear a little more than usual in this video...
Links:
Ian Mavrics Grafyx board site (includes software): http://members.iinet.net.au/~ianmav/hires/hires.htm
Catalog images from RadioShack Catalogs: https://www.radioshackcatalogs.com/flipbook/c1984_rsc-10.html
Music/SFX (in order):
D A T Recorder Fast Forward (Digital Juice)
Corky Dodges Traffic by Richard Ames (Digital Juice)
Video clip:
Rain Main (Four-second Slot Machines clip at 16:10), [official MGM link not found], MGM/UA Communications Co., 1988
Chapters:
Intro / Background (0:00)
Machine Apart / VGA Connector / Gate-Array vs. Non-Gate-Array (1:53)
Installing the Grafyx Card (4:14)
Smoke Test / GBASIC with GTEST/BAS / Spare Parts? (5:19)
Software - GBASIC - Missile (7:22)
Software - Post Master (9:12)
Software - Tournament Chess (13:40)
Software - Slot Machine (15:17)
Software - GBASIC - Tunnel (17:01)
Bonus - Comprehensive HRGTEST/CMD (17:54)
Outro (20:05)
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 Owners Group on Facebook
Twitter (Im TJBChris there...)
The Level29 BBS (Im TJBChris there, too.)
Particles BBS (Guess who I am here? Yeah, TJBChris.)
Thanks for watching! TRS-80 Model 4 Hi-Res Graphics Upgrade](https://i.ytimg.com/vi/pjbFZ7qUR6k/mqdefault.jpg)


