Oddly, that's where the strange adventures of Deadman began, with Strange Adventures #205 (October, 1967) by Arnold Drake, Carmine Infantino and George Roussos (collected in a few places, including 2002's The Deadman Collection with cover by Neal Adams).
These two stories were reprinted in Deadman #1 (May, 1985) under a new Neal Adams cover, along with a story from House of Mystery #178 (January-February, 1969) by Neal Adams. Nicola Cuti also interviews Arnold Drake about the creation of Deadman, which he attributes to deadlines!
These two stories found their way into Deadman #2 (June, 1985), under a new Neal Adams cover, along with a reprint of half of "Second Choice" from House of Secrets #85 (April-May, 1970), written by Gerry Conway, pencilled by Gil Kane, and inked by Neal Adams.
These two stories are reprinted in Deadman #3 (July, 1985), along with the second half of "Second Choice" from House of Secrets #85 (April-May, 1970).
These two stories are reprinted in Deadman #4 (August, 1985), along with the "Above And Beyond The Call Of Duty" story Witching Hour #8 (April-May, 1970) by co-writer Sergio Aragones and writer/artist Neal Adams.
Baxter paper Deadman #5 (September, 1985) reprints these two stories, with no extras, as the stories are now large enough to fill an issue without extras, other than some of the best of the letter pages from Strange Adventures during Deadman's run.
Deadman #6 (October, 1985) reprints these stories, along with an interview by Dick Giordano, who was editing the Strange Adventures' Deadman series at the time.