The original Apple II and its successors used a series of 2KB or 4KB chips to house their operating environment.
Introduced with the Apple II Plus, these six 2KB chips (mapped from $D000 to $F800) added floating-point math support and the "Autostart ROM," which allowed the computer to boot directly into a disk drive. Apple II Roms
Found in the original Apple II, providing a fast but limited BASIC language and the "Old Monitor" firmware. The original Apple II and its successors used