Windows 98 build 1434
Because the dates of 1434 and 1488 are so close, this strongly implies that Microsoft may have jumped build numbers at some point. This is a WinHEC and a COMDEX build because 1511 crashed. It was released on 1997-04-28 as an update to the WinHEC release (build 1423). This build has a new installer similar to the one in 1488.
Just like 1423, this build has no IE4 shell and can't find the files from the Memphis CD-ROM at the end. To fix this the files must be copied from the CD to a folder on the C: drive.
This build introduces a new bug reporter, with a warning asking you if you are part of the Memphis beta program.