What is the value for internal floppy disk with s-100 slots greater than 8 introduced earlier than 1978?
CREATE TABLE "cromemco_s_100_microcomputer_systems_z_8" (
  "system" text,
  "year_introduced" real,
  "s_100_slots" real,
  "internal_floppy_disk" text,
  "internal_hard_disk" text
);
SELECT "internal_floppy_disk" FROM "cromemco_s_100_microcomputer_systems_z_8" WHERE "s_100_slots">8 AND "year_introduced"<1978;