We present an enumerative technique for encoding and decoding dc-free runle
ngth-limited sequences. This technique enables the encoding and decoding of
sequences approaching the maxentropic performance bounds very closely in t
erms of code rate and low-frequency suppression capability. Use of finite-p
recision floating-point notation to express the weight coefficients results
in channel encoders and decoders of moderate complexity. For channel const
raints of practical interest, the hardware required for implementing such a
quasi-maxentropic coding scheme consists mainly of a ROM of at mast 5 kB.