Even though the protocol could permit it, the reference (l)rzsz implementation cannot encode arbitrary non-control characters (e.g.This design limits the feasibility of ZMODEM to only reliably transfer files that are under 4GB in size. ZACK, ZRPOS) embed a byte-offset within the transferred file as a 32-bit unsigned integer. Finally, ZMODEM-90 includes a basic run-length encoding compression system to further improve performance on uncompressed files. A similar improvement allows ZMODEM-90 to work on 7-bit networks, whereas earlier protocols (with the notable exception of Kermit) had all demanded 8-bits to one degree or another. Even on networks that 'eat' control characters, ZMODEM-90 can be tailored to quote only those characters the network actually eats, as opposed to every possible one. The first of these is MobyTurbo, which removed control quoting to further improve performance, about 15%. Forsberg himself collected a number of improvements into ZMODEM-90.
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