Exhibit 4.12 AMENDED AND RESTATED UNDERWRITING AGREEMENT July 17, 2007 Zarlink Semiconductor Inc. 400 March Rd. Ottawa, ON K2K 3HA Attention: Dear Sirs/Mesdames: CIBC World Markets Inc. (the "Lead Underwriter"), National Bank Financial Inc., RBC...Underwriting Agreement • July 24th, 2007 • Zarlink Semiconductor Inc • Semiconductors & related devices • Ontario
BETWEENZarlink Semiconductor Inc • July 24th, 2007 • Semiconductors & related devices • Ontario
Exhibit 4.8 SUBSCRIPTION RECEIPT AGREEMENTSubscription Receipt Agreement • July 24th, 2007 • Zarlink Semiconductor Inc • Semiconductors & related devices • Ontario
