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Up to four simultaneous streams are allowed called (A), (B), (C) and (D).

Note that if more than one input stream of data is used, the READ command must be used.

If character data and column binary data are both needed then use CARD CHARACTERS BINARY to allocate the data locations. You can still read into buffers, for example READ (B) $501-580 to read a card from stream B into buffer 5.

When two or more streams are read the READ command is followed by (A), (B), (C) or (D) to specify the stream to be read.

More than one data file can be read sequentially on streams (A) and (B). See the Run Control Parameter C (cards) .

All but the first stream can be rewound to allow a data file to be used for lookup. See the READ REWIND command.