frame

description of a frame.

A frame is the basic storage area of the system. Each frame is addressed by its numeric 'fid', beginning with frame 0, and ending at a frame called 'maxfid'. Maxfid is determined by the actual size of the disk and the size of data frames.

The number of bytes for the linkage and data areas of a frame are implementation specific.

On R83 implementations, the frames size was 512 bytes, with the first 12 bytes of each frame being reserved for the linkage fields.

AP/DOS and AP/Native both use 1024-byte (1K) frames, with the first 24 bytes being used for the linkages.

Most of the AP/Unix-based implementations use 2048-byte (2K) frames, with the first 48 bytes being reserved for the linkage fields.

The 'what' command contains the size of the data area of the frames on your system under the column heading 'dfsize'. Note that only the data portion shows. For instance, if the 'dfsize' on your system is shown as 2000, this indicates a 2K (2048 byte) frame size.