2820 HD (250-3553) Catalog Listing Faxback Doc. # 1820 1826 Additional Floppy Drive 1825 Battery 1822 Features 1829 External Monitor 1858 Hard Disk Reinitialization 1831 Keyboard 1827 Math Coprocessor 1823 Memory Upgrades 1817 Pinouts 1828 Power Management 1830 Printer 1832 Serial Devices 1824 Setup 1821 Specifications (smm 08/24/93)