If you decides to burn the OS-B 400/800 OS on a 27128 (16K), does the 10K ROM fit on the first 10K (0000-27FF) or the last 10K (1800-3FFF)? I think the OS resides in the last 16K block of the memory map (B000-FFFF). The XL series of OS's are easy since they are the full 16K.
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