TRS-80 Model I with a screwy screen. Let’s fix it!

No video

TRS-80 Model I with a screwy screen. Let’s fix it!

Рет қаралды 1,214

Күн бұрын

Video sponsor: PCBWay: $5 for 2 layer PCBs with 24hr turnaround at pcbway.com/g/m3hn11
In this video we take a look at one of the original ‘big three’ computers. A TRS-80 Model I. It has a screw screen output consisting of garbage repeated 4 times. Let’s take a look at this classic piece of computing history and get it working like new once again.
Timeline:
00:00 - Welcome
00:52 - Symptoms and PCR
05:00 - Video Divider Chain
11:24 - Garbage screen cleaning
16:04 - Will Diag. ROM help?
24:38 - Keyboard testing
26:55 - Wrap up. Thanks!
Please consider clicking on the Subscribe button below and then click the bell icon. That way you will be notified when I post a new video. Thanks!
Help support Hey Birt!
www.heybirt.com - merch
www.paypal.me/HeyBirt
/ heybirt
www.subscribestar.com/hey-birt
Hey Birt! On Social Media!
Facebook:
Soigeneris: / soigeneris-29552758379...
Hey Birt!: / heybirt
Twitter:
Hey Birt!: HeyBirt?lang=en
Links
Ira Goldklang’s site: www.trs-80.com/wordpress/welc...
Diagnostic ROM: github.com/misterblack1/trs80...
Amazon Associated Links Tools:
Fiberglass pen: amzn.to/3pWRzIk
Fiberglass pen refills: amzn.to/3RgqGdQ
OWDEN Hollow punch set: amzn.to/3PXzTXW
Battery Spot Welder: amzn.to/3QMaG3T
Hotplate: amzn.to/3rxOtLU
Spudger set I use: amzn.to/3z19pM7
Heat mats: amzn.to/3MXgSVG
Amazon Associated Links Chemicals:
303 Aerospace Protectant: amzn.to/3BxRa5Y
CiaKot: amzn.to/3CvVKiY
Overcaot Pen: amzn.to/3s439Bt
Novus Plastic Polish: amzn.to/2VwtFaV
Electronics / PCB cleaner: amzn.to/3ORx62D
Citric Acid: amzn.to/3krkgdt
Amazon Associated Links Parts / Supplies:
Foam sheet, 1mm: amzn.to/37CfTtt
Uxcell shrink wrap: amzn.to/3boKJEd
NiMh tabbed Sun-C: amzn.to/3nHCbxL
NiMh tabbed AA: amzn.to/3OMjBkW
uxCell strain reliefs: amzn.to/3nJ5AaP
3M Double sided tape: amzn.to/3p9odcG
Noctua 80mm NF-A8 FLX fan: amzn.to/3ASVhsJ
Credits
Chiptune Thing No. 3 "Victory" by Steven O’Brien / stevenobrien
Creative Commons - Attribution 3.0 Unported- CC BY 3.0
creativecommons.org/licenses/b...
Music provided by Music for Creators • Chiptune Thing No .3 V...

Пікірлер: 12

@lazarian4428 2 ай бұрын

Glad It worked out. I have a 4K Model 1 that I'm going to start restoring. One of the shift keys broke and I'll be upgrading its memory. I love the 8-bit era!

@rscelectrical7091 2 ай бұрын

Brilliant video and diagnosis as always, thanks for taking the time to do this. I always learn something from your content.

@joeagrella6753 2 ай бұрын

Good Video on trouble shooting.

@f15sim 2 ай бұрын

Nicely done!

@dmuntz 2 ай бұрын

Don't see a Level I Model I every day. Seems like most got upgraded. I picked up a Model I from Goodwill several years ago, in the travel case, but didn't open it until recently. It's absolutely immaculate--even smelled like new TRS-80. Looked at the bottom, and turns out it's a virgin--the warrantee sticker was never broken. Sadly, it does have a problem. I suspect one line from the keyboard matrix has become disconnected, because some of the keys are interpreted incorrectly. I haven't looked into it further, and I'm torn because I really hate to open the thing when it's made it all these years unscathed :-). Can probably tell exactly what line isn't working when I go back and look at which keys are working, and which are showing as duplicates when typing. Maybe I can perform orthoscopic surgery on it...

@KlodFather 2 ай бұрын

Old man glasses.... HEY! I resemble that remark! ha ha From one old nerdy fart to another. Nice video. I fixed a lot of video games in the late 80's and 90's. Later video poker machines for the mob in bars LOL and cable descramblers with my trusty eprom programmer. Thanks for sharing. God bless. The KlodFather.

@HeyBirt 2 ай бұрын

I think half the secret to getting older is having the correct pair of glasses for every situation.

@KlodFather 2 ай бұрын

@@HeyBirt - I have three strengths. One to walk and drive and two strengths to see things and to read. I even have a special pair to watch TV with a specific diopter. Too many years as a tech and engineer looking at screens and small parts... Now my eyes are kinda fixed in a far sighted kind of way. 1.25 to drive. 2.0 for TV. 2.5 and 3.0 for small work and sometimes a boom magnifier or two LOL I have two lighted 8 inch and two 5 inch lens magnifiers.