This three‑piece ephemera lot documents Applied Engineering’s 1990 introduction of DataLink modems for the Macintosh. Included are a glossy four‑page promotional brochure detailing the DataLink Express, DataLink/Mac, and DataLink/Mac Portable models; an April 17, 1990 letter on Applied Engineering letterhead announcing the new modem line; and a Special Order Form offering introductory pricing. Together, these materials illustrate early Macintosh connectivity marketing and the transition into consumer modem‑based communication.Each piece measures approximately 8½ × 11 inches.Good vintage condition with light handling wear. The brochure shows some age‑related yellowing. All pages are clean, intact, and fully legible.