add apple ii biz graphics video under ephemera

README.md

@@ -306,6 +306,7 @@ Sorted alphabetically by company name and product name.
 - [Houston Instrument Omnigraphic Plotter Brochure](https://archive.org/details/TNM_Omnigraphic_Plotter_20171016_0228)
 - [Sweet-P Plotter Brochure and Price List](https://archive.org/details/bitsavers_enterCompuersonalPlotterprricelistBrochure_4929854) – Four-page color marketing brochure with attached suggested retail price list.
 - [IEEE Electronic Systems News Autumn (1985)](https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=5345111) – Review of the three-color Penman robotic plotter.
+- [Apple II Business Graphics Film (1982)](https://archive.org/details/apple-ii-business-graphics) – Unidentified drum plotter drawing bar charts at 4:57.
 
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