EFFICIENT REVERSE MESSAGE SCROLLING IN A PORTABLE COMMUNICATIONS DEVICE
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-27
Today, many alphanumeric pagers lack the ability to incrementally scroll back in a message. The main reason for lacking the feature is not due to user interface constraints, as one may expect. It is primarily due to the high software implementation cost. The typical implementation requires the software to store the reverse scrolling control information along with the stored message data. This reduced the pagers message storage capacity, sometimes as much as 10%. This paper presents an alternative implementation which reduces the RAM cost (overhead) of the implementation to less than 1% while minimally impacting ROM and execution time.