| | | Saturday, September 20th, 1980 | | Activated SP Ted Lamoreaux from the disabled list. | | Thursday, August 21st, 1980 | | SP José Ramos was designated for assignment, placed on waivers and taken off the 40-man roster. | | Thursday, August 14th, 1980 | | Failed to sign 6th round draft pick Jorge Hernández. | | Failed to sign 7th round draft pick Jim Oliver. | | Monday, August 11th, 1980 | | Signed Tom Larsen to a minor league contract with a signing bonus of $25,000. | | Sunday, August 10th, 1980 | | Signed Michael Zimmerman to a minor league contract with a signing bonus of $146,500. | | Saturday, August 9th, 1980 | | Signed Chris Ramsey to a minor league contract with a signing bonus of $30,600. | | Saturday, August 2nd, 1980 | | Placed CF Lucas Avery on the 60-day disabled list. | | Saturday, July 5th, 1980 | | Signed Juan Ramos to a minor league contract with a signing bonus of $80,900. | | Wednesday, June 25th, 1980 | | Signed Roberto Montoya to a minor league contract with a signing bonus of $24,100. | | Monday, June 23rd, 1980 | | Signed Ray Montgomery to a minor league contract with a signing bonus of $292,600. | | Thursday, May 15th, 1980 | | Activated RF Dave Hicks from the 60-day disabled list. | | 1B Andy Thomas was designated for assignment and placed on waivers (from active). | | Friday, April 18th, 1980 | | Purchased the contract of SP Arinori Ito from Double A Galveston. | | SP José Blanco was designated for assignment, placed on waivers and taken off the 40-man roster. | | Sunday, March 30th, 1980 | | Placed LF Lucas Avery on the 9-day disabled list. | | Wednesday, November 7th, 1979 | | Signed bench coach Terry Jackson to a 4-year, $104,400 per year contract. | |
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