2800 HD (250-3550) Options Faxback Doc. # 1851 ø Hayes-compatible internal 2400-BPS modem (Cat. No. 25-3555) (order from Tandy Consumer Mail) ø Memory upgrade adapter (Cat. No. 25-3554) (order from Tandy National Parts) Increases the amount of memory from 1MB to 2MB. ø 80c287-12 Math Coprocessor (order from Third Party Products) or The math coprocessor for the 2800 HD is also available from Intel. The chip I.D. number N80C287XLT. The customer can call Intel at 1-800-538-3373 and with a touch tone phone, select Product Information ( #2 ), then select End User Information ( #2 ). The representative can give the name of a local dealer where the customer can obtain the coprocessor. (rjs-06/10/93)