Format of '.tap' files on bitsavers ...

Eric Smith eric at
Sat Mar 12 01:56:38 CST 2005

John Sambrook wrote:
> Anyone know the format of ".tap" files found on
> ?

It's John Wilson's tape image file format.

A data record consists of a four byte record length, the data,
then another copy of the record length.  The record length is stored
in little-endian byte order.

A tape mark is fourbytes of zeros.

There are no extra padding bytes to force any alignment.

Bob Subnik's SIMH tape image file format is similar except that it
uses 16-bit alignment.  SIMH comes with utilities to convert the

There are also some simple tape image utilities at:


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