Hey Birt! | Easy TRS-80 M100 (and NEC PC-8201a) factory RS-232 mod 40 years late! @HeyBirt | Uploaded February 2023 | Updated October 2024, 4 hours ago.
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In this video we take a look at an official TRS-80 Model 100 factory modification that was done to the RS-232 port. This was released as TSB 100-001 almost 40 years ago. The early M100s had too large a currently limiting resistor in the RS-232 output lines which caused compatibility problems with some other TRS-80 products as well as other RS-232 devices.
We discover what the problem is, we apply the modification as per the bulletin, and test the results to see how it performs. We also find this same modification also applies to the NEC-8201a which uses the exact same RS-232 circuit design and has the same problem.
Timeline:
00:00 – Welcome
02:46 – Problem demonstration and source
10:48 – Fixing the problem
16:32 – Testing our fix
18:17 – It works for the NEC PC-8201a too!
18:50 – Wrap up. Thanks!
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Links
TRS-80 Portable Tech Bulletins: soigeneris.com/document/vintcom/Tandy_Technical_Bulletins.zip
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Noctua 80mm NF-A8 FLX fan: amzn.to/3ASVhsJ
Credits
Chiptune Thing No. 3 "Victory" by Steven O’Brien soundcloud.com/stevenobrien
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
http://creativecommons.org/licenses/b...
Music provided by Music for Creators youtu.be/ujIMRIJ1JG8
Video sponsor: PCBWay: $5 for 2-layer PCBs with 24hr turnaround at pcbway.com
In this video we take a look at an official TRS-80 Model 100 factory modification that was done to the RS-232 port. This was released as TSB 100-001 almost 40 years ago. The early M100s had too large a currently limiting resistor in the RS-232 output lines which caused compatibility problems with some other TRS-80 products as well as other RS-232 devices.
We discover what the problem is, we apply the modification as per the bulletin, and test the results to see how it performs. We also find this same modification also applies to the NEC-8201a which uses the exact same RS-232 circuit design and has the same problem.
Timeline:
00:00 – Welcome
02:46 – Problem demonstration and source
10:48 – Fixing the problem
16:32 – Testing our fix
18:17 – It works for the NEC PC-8201a too!
18:50 – 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!
heybirt.com - merch
paypal.me/HeyBirt
patreon.com/heybirt
subscribestar.com/hey-birt
Hey Birt! On Social Media!
Facebook:
Soigeneris: facebook.com/Soigeneris-295527583797729
Hey Birt!: facebook.com/HeyBirt
Twitter:
Hey Birt!: twitter.com/HeyBirt?lang=en
Links
TRS-80 Portable Tech Bulletins: soigeneris.com/document/vintcom/Tandy_Technical_Bulletins.zip
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/3boKDwl
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/3rYCxBX
Noctua 80mm NF-A8 FLX fan: amzn.to/3ASVhsJ
Credits
Chiptune Thing No. 3 "Victory" by Steven O’Brien soundcloud.com/stevenobrien
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
http://creativecommons.org/licenses/b...
Music provided by Music for Creators youtu.be/ujIMRIJ1JG8
