PAGEBACK128 by Simon Tracy (1989) is a bi-directional file reader for the 80 column Commodore 128.

Most sequential file readers are unidirectional; they work in a forward direction only. Once text has scrolled off the screen, the only way to see it again is to load and read the file frow the beginning a second time. This program makes reading a sequential file work like reading a book by implementing bidirectional commands which permit the user to page backwards as well as forwards within a sequential file. In addition, the program includes versatile printing options which often eliminate the need to reformat files with a word processor prior to printing,

PAGEBACK 128 is written in BASIC 7.0 for the Commodore 128 using FAST Mode and requires an 80 coIumn monitor. The program includes two Machine-language subroutines: one for loading the sequential file to a 62.5K buffer and a second routine which implements the file- reading commands. All user choices are clearly presented on screen and efficiently handled by GETKEY statements or INPUT statements with the most likely choice already printed under the cursor.