In August 1988 Apple introduced the Apple Scanner. It was their first A4

ISO 216

ISO 216 specifies international standard paper sizes used in most countries in the world today. It defines the "A" and "B" series of paper sizes, including A4, the most commonly available size...

 (8.5 in x 14.0 in) flatbed scanner. It was capable of a 4-bit

4-bit

The Intel 4004, the world's first commercially available single-chip microprocessor, was a 4-bit CPU. The F-14 Tomcat's Central Air Data Computer was created a year before the 4004, but its existence was classified by the United States Navy until 1997...

 image with 16 levels of grey in a maximum resolution of 300 dpi

DPI

DPI may stand for* Dots per inch, a measure of printing resolution* Dhaka Polytechnic Institute, an educational institution of Bangladesh* Death Pact International, one of the first open source musical concept projects...

. The scanner could complete a full scan in 20.4 seconds. It shipped with a SCSI

SCSI

Small Computer System Interface is a set of standards for physically connecting and transferring data between computers and peripheral devices. The SCSI standards define commands, protocols, and electrical and optical interfaces. SCSI is most commonly used for hard disks and tape drives, but it...

 connection with an optional ADB

Apple Desktop Bus

Apple Desktop Bus is an obsolete bit-serial computer bus connecting low-speed devices to computers. Used primarily on the Macintosh platform, ADB equipment is still available but not supported by most Apple hardware manufactured since 1999....

 port.

The scanner was upgraded to the short lived Apple OneScanner in 1991 with 256 levels of grey.