PMA

PMA is a variant of the LHA archiving format, with the same basic structure but a different set of compression types. These compression types originated in the CP/M archiver PMarc, created by Miyo.

It is not to be confused with the archives of the Precision Metalforming Association or the Pacific Maritime Association or the Polish Museum of America.

Links

 * Info in Wikipedia
 * Some sample PMA files (among other formats)