Here's the Digistore Read command, a SCSI code &8 for sequential access devices, same as any SCSI read. The difference between random access and sequential access devices is that here we don't specify the start position to read from, only the length of the data to be read. The starting point is the current position of the tape, which may be set if required by other means.

Another difference here, at least for the 8-bit Acorn world, is that the Digistore uses 512 bytes sectors, so we need to DIM the right amount of space for the number of sectors being read.

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