The 49ers signed two of their 11 selections to three-year contracts: cornerback Derrick Johnson, a sixth-round pick out of Washington, and wide receiver Marcus Maxwell of Oregon, the first of three seventh-round choices.
The Raiders signed quarterback Andrew Walter, a third-round pick from Arizona State, and defensive end Ryan Riddle of Cal, a sixth-round selection, to undisclosed contracts, leaving four draft picks unsigned before rookies and selected veterans report to camp Monday.
Tackle Pete McMahon, another sixth-round selection, signed Thursday.
The 49ers, as well as the rest of the NFL, await the signing of quarterback Alex Smith, the No.1 overall choice in the draft.
Through Friday, no first-round choice had signed, in part because the first-round salaries and bonuses are negotiated and slotted off of the figures of the No.1 pick.
Tom Condon, the agent for Smith, was due in the Bay Area this weekend in an attempt to finalize a contract that 49ers executive Paraag Marathe has said is "80 percent" complete.
San Francisco is in good shape with regard to the salary cap, with $6,346,389 to spare for 2005, according to Wednesday's official NFL tally.
The 49ers had a rookie pool of $6,168,320, meaning they should be able to bring in their entire draft class without releasing or renegotiating any current contracts.
The Raiders still have some salary-cap maneuvering to do to reel in their draft class. Their rookie pool is $3,482,560, but they had just $1,573,685 of room under the cap through Thursday.
The Raiders will clear an additional $765,000 when quarterback Rich Gannon either files retirement papers or is waived. The club is expected to hold a retirement ceremony for Gannon, possibly when the team convenes in Napa after July 28.
Oakland also released free-agent tackle Ivan Douglas.