Editing Apple I (section)

===Apple Cassette Interface expansion===
{{Listen image
| main_image         = Apple Cassette Interface.jpg
| main_image_caption = The Apple Cassette Interface expansion card. There are two [[phone connector (audio)|phone connector ports]] for reading and writing programs to a connected cassette deck.
| main_image_alt     = A green circuit board with six chips in a row. There are two phone jacks in the top-left corner. A gold edge connector runs along the bottom of the board.
| filename           = Apple Cassette Interface BASIC.wav
| title              = Apple BASIC cassette tape
| description        = This cassette tape was distributed with the Apple&nbsp;I. Playing this file into an Apple Cassette Interface will load Apple BASIC.
}}
A cassette interface was available in the form of an optional add-on for the Apple I's expansion slot. A [[cassette deck]] plugged in to the expansion's [[Phone connector (audio)|phone connector ports]] could be written to and read from as a form of [[removable storage]]. The only alternative to the interface for loading programs was typing machine code by hand, making the add-on "ubiquitous".{{sfn|Owad|2005|p=3}}

The expansion came with a free cassette tape containing [[Steve Wozniak]]'s [[Integer BASIC]] interpreter. Other software tapes were supplied "at minimal cost"<ref name="byte ad"/> including [[porting|ported]] video games such as ''[[Hamurabi (video game)|Hamurabi]]'', ''[[Lunar Lander (video game genre)|Lunar Lander]]'' and ''[[Star Trek (1971 video game)|Star Trek]]''.<ref name="1977 price list"/>