Question: What is the value for internal floppy disk with s-100 slots greater than 8 introduced earlier than 1978?
SQL: SELECT "Internal Floppy Disk" FROM "2-16254057-1" WHERE "S-100 slots" > 8.0 AND "Year Introduced" < 1978.0;

Question: Which system introduced earlier than 1981 has an internal hard disk of 11 megabytes and less than 21 s-100 slots?
SQL: SELECT "System" FROM "2-16254057-1" WHERE "S-100 slots" < 21.0 AND "Year Introduced" < 1981.0 AND "Internal Hard Disk" = '11 megabytes';