The Model 1 is fixed and you'll be surprised to find out what was wrong!

#septandy #lowercasemod

In part 1, this machine was presenting with an odd video problem that really had me stumped. I also upgraded the video memory to 8-bits but that resulted in a different problem. In this video, I fix both of these issues and finally get this machine working with the expansion interface.

Part 0:    • TRS-80 Model 1 test and teardown  
Part 1:    • TRS-80 Model 1 repair and lower case ...  
Part 2: This part!

Diagnostic ROM deep dive companion video:
   • Let's talk: Our brand new TRS-80 Diag...  

--- Video Links

Here's where this machine came from! (and all of the TRS-80 machines Al Miner's grandfather had:)
   • Grandpa's stash of TRS-80s and Tandy ...  

TRS-80 Model 1 (and Model 3) diagnostic ROM:
https://github.com/misterblack1/trs80...

2364 adapter PCB:
https://www.pcbway.com/project/sharep...

Frank IZ8DWF's channel: (for really amazing repairs)
   / iz8dwf  

When good caps go bad: (t-shirt donated by Jesse)
https://www.teepublic.com/t-shirt/241...

Adrian's Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spr...

Adrian's Digital Basement ][ (Second Channel)
   / @adriansdigitalbasement2  

Support the channel on Patreon:
  / adriansdigitalbasement  

-- Tools

Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.16...

O-Ring Pick Set: (I use these to lift chips off boards)
https://amzn.to/3a9x54J

Elenco Electronics LP-560 Logic Probe:
https://amzn.to/2VrT5lW

Hakko FR301 Desoldering Iron:
https://amzn.to/2ye6xC0

Rigol DS1054Z Four Channel Oscilloscope:
https://www.rigolna.com/products/digi...

Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:
https://amzn.to/3adRbuy

TL866II Plus Chip Tester and EPROM programmer: (The MiniPro)
https://amzn.to/2wG4tlP
https://www.aliexpress.com/item/33000...

TS100 Soldering Iron:
https://amzn.to/2K36dJ5
https://www.ebay.com/itm/TS100-65W-MI...

EEVBlog 121GW Multimeter:
https://www.eevblog.com/product/121gw/

DSLogic Basic Logic Analyzer:
https://amzn.to/2RDSDQw
https://www.ebay.com/itm/USB-Logic-DS...

Magnetic Screw Holder:
https://amzn.to/3b8LOhG
https://www.harborfreight.com/4-inch-...

Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
https://www.ebay.com/itm/14-16-18-20-...

RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI)
http://www.retrotink.com/

Plato (Clone) Side Cutters: (order five)
https://www.ebay.com/itm/1-2-5-10PCS-...

Heat Sinks:
https://www.aliexpress.com/item/32537...

Little squeezy bottles: (available elsewhere too)
https://amzn.to/3b8LOOI

--- Links

My GitHub repository:
https://github.com/misterblack1?tab=r...

Commodore Computer Club / Vancouver, WA – Portland, OR – PDX Commodore Users Group
https://www.commodorecomputerclub.com/

--- Instructional videos

My video on damage-free chip removal:
   • How to remove chips without damaging ...  

--- Music

Intro music and other tracks by:
Nathan Divino
@itsnathandivino