Tandy 870-9838 1700381 Memory Card 8 SIMM Sockets Tandy 6000 Radio Shack Rev D

Tandy 870-9838 1700381 Memory Card 8 SIMM Sockets Tandy 6000 Radio Shack Rev D

The Tandy 870-9838 is a memory expansion card manufactured by Tandy Corporation (Radio Shack) for use in the Tandy 6000 and related multi-user business systems. The card features eight SIMM sockets for installing additional RAM modules and connects to the host system via a proprietary card-edge interface. Board revision is Rev D (PCB assembly number 1700381), and the card is marked "MADE IN USA."

Specifications & What's Included

• Part Number: 870-9838
• PCB Assembly Number: 1700381, Rev D
• Memory sockets: 8 SIMM sockets
• Edge connector: proprietary Tandy card-edge interface
• Manufacturer: Tandy Corp. / Radio Shack, Made in USA
• Card only — no memory SIMM modules included unless shown populated in photos (SIMMs visible in photos are installed on the card as pictured)

Applications

The Tandy 6000 was Tandy/Radio Shack's high-end multi-user business computer platform of the early-to-mid 1980s, running XENIX (Microsoft's implementation of Unix) and supporting multiple simultaneous terminals. It was aimed at small business and professional environments that needed a shared computing resource at a time when personal computers were still largely single-user. Memory expansion cards like the 870-9838 were essential for increasing the system's RAM beyond its base configuration, which directly affected the number of users and applications the system could support concurrently. Today these cards are sought primarily by vintage computer collectors and enthusiasts maintaining or restoring Tandy 6000, Model 16, and Model 16B systems — a niche but dedicated community for this early-1980s Unix-based platform.