The complete store used 16 modules for a total of 131,072 words (128 kibiwords), equivalent to 720,896 8-bit bytes (704 KiB).

Piggyback twistor

Another form of twistor ROM replaced the permanent magnet cards with a second magnetic tape wrapped around the first on the twistor lines, in a "piggyback" configuration. This tape was coated with coballoy instead of permalloy, which is much "harder" magnetically, requiring about twice the field in order to flip. To make the system even harder, the coballoy tape was about two and a half

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