Epson PX-4, Revival and testing with Dial-A-ROM and Backpack Drive

In this video we’ll take a look at an Epson PX-4 a rather uncommon amalgamation of the HX-20 and PX-8. We go on to build some new battery packs, check the health of the capacitors so we can test out the general functionality. Then we do some exploration to see if the PX-8 DAR will work on the PX-4 and also test to see if the uBPD PF-10 emulation works with the PX-4. Timeline: 00:00 – Welcome 00:40 – Overview of PX-4 13:15 – Cap testing, PCB overview 15:30 – Building battery packs 21:50 – General testing, using CONFIG from DAR 29:37 – Config and testing with uBPD 39:34 – Wrap up 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! https://www.heybirt.com - merch https://www.paypal.me/HeyBirt   / heybirt   https://www.subscribestar.com/hey-birt Hey Birt! On Social Media! Facebook: Soigeneris:   / soigeneris-295527583797729   Hey Birt!:   / heybirt   Twitter: Hey Birt!: https://twitter.com/HeyBirt?lang=en Links PX-4 Information: https://electrickery.nl/comp/px4/inde... Amazon Associated Links Tools: Fiberglass pen: https://amzn.to/3pWRzIk Fiberglass pen refills: https://amzn.to/3RgqGdQ OWDEN Hollow punch set: https://amzn.to/3PXzTXW Battery Spot Welder: https://amzn.to/3QMaG3T Hotplate: https://amzn.to/3rxOtLU Spudger set I use: https://amzn.to/3z19pM7 Heat mats: https://amzn.to/3MXgSVG Amazon Associated Links Chemicals: 303 Aerospace Protectant: https://amzn.to/3BxRa5Y CiaKot: https://amzn.to/3CvVKiY Overcaot Pen: https://amzn.to/3s439Bt Novus Plastic Polish: https://amzn.to/2VwtFaV Electronics / PCB cleaner: https://amzn.to/3ORx62D Citric Acid: https://amzn.to/3krkgdt Amazon Associated Links Parts / Supplies: Foam sheet, 1mm: https://amzn.to/37CfTtt Uxcell shrink wrap: https://amzn.to/3boKJEd NiMh tabbed Sun-C: https://amzn.to/3nHCbxL NiMh tabbed AA: https://amzn.to/3OMjBkW uxCell strain reliefs: https://amzn.to/3nJ5AaP 3M Double sided tape: https://amzn.to/3p9odcG Noctua 80mm NF-A8 FLX fan: https://amzn.to/3ASVhsJ Credits Chiptune Thing No. 3 "Victory" by Steven O’Brien   / stevenobrien   Creative Commons — Attribution 3.0 Unported— CC BY 3.0 http://creativecommons.org/licenses/b... Music provided by Music for Creators    • Chiptune Thing No .3 Victory — Steven O’Brien