Programs and an audio track
The 1010 records programs and data, but Atari cassettes could also carry speech or music on a separate track. Language courses, for example, used recorded speech alongside software.
Standard transfers run at 600 baud. Headers, gaps between records and winding add to loading time. A program's beginning is located using the counter and transport buttons.
Two SIO sockets
Two rear sockets let the 1010 sit between the computer and another SIO device. It needs its own power supply, unlike the later computer-powered XC12.
The Atari controls the motor. PLAY sets the recorder for reading, while the computer starts and stops tape movement; PAUSE additionally locks the mechanism.
Sanyo and Chelco versions
Sanyo made the 1010S; Chelco made the 1010C. Their mechanisms and electronics differ. They can be identified by the underside FCC ID and button order: PAUSE precedes STOP/EJECT on the 1010S, with the reverse order on the 1010C.
The service manual includes separate schematics for both versions and describes differences in the 1010C indicator. Repairs therefore require the schematic for the specific version.