Memory Expansion Board (250-5030) Features Faxback Doc. # 2036 The 32-Bit memory expansion board lets you easily increase your Tandy 4000's memory by two megabytes. Using the 32-Bit memory expansion board, you can expand the total system memory to four megabytes. The main logic board of your system must be full of RAM before the 32-Bit memory expansion board can be used. (RJS/jlc-03/28/94)