Ian Mavric was kind enough to provide the Model 4 Service Manual Addendum. Thank you, Ian!
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A site visitor has a working Model 4 (or at least drive :0 does) for sale for $300 for local pickup. Unit does have a loose connection in the plug at the power supply that powers the CRT filament, although most of the time the connection is good as is. Probably an easy fix. Drive 1 works when in Drive 0 position, so perhaps there is an issue with the controller or cable for the :1 position.
Seller is located about 100 miles NW of San Antonio, TX a few miles off of I-10; and could meet in or around Kerrville, Texas if that’s better.
If this sounds good, please reach out directly to Brick Parrish at 
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Jay Crutti has designed a full Model 4 keyboard replacement. You can get more information Here.
Right now, you can build it yourself, although Jay is contemplating selling them in the future.
William Bares had also lent some disks …
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Eddie, of https://tandyshowcase.com/ has scanned some Sacramento Tandy Users Group newsletters!
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Since my test auction for the 1983 year of 80-US actually sold, I am willing to brave the dangers of eBay and try to list a bunch of stuff.
Right now the following auctions are live.
William Bares was kind enough to lend me some tapes to read!
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More manuals, Brick Parrish
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Amardeep was kind enough to provide the articles he had collected regarding installing 4164 RAM chips in a Model I.
William Bares was kind enough to scan the missing Alien Armada manual. Thank you, William!
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