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Figures 5(a-b): A 794275-X MFP-A4 card suitable for the 1-Hz Option: notice the
presence of U17 (normally missing) and of two EPROMS (U1 and
U2) that include the 1-Hz software (front and rear views).
Figure 5c: Details of U17 connections (wire bridges in the front of the MFP-A4 card)
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