File No. S370-30
Systems Introduction to VTAM
Access Method (VTAM)
Fourth Edition (August 1975)
This edition applies to VTAM Level 2 when available in DOS/VS, OS/VS1, and OS/VS2. Until
VTAM Level 2 is available in an operating system, the information in this publication is for
planning purposes and is subject to change. VTAM Level 2 includes support for switched SDLC
links, local 3790 attachment, and the SDLC 3270, 3650, 3660, 3770, and System/32. For
VTAM Level 2 users, this edition replaces the previous edition, GC27-6987-3. Changes will be
reported in subsequent revisions or Technical Newsletters.
Copies of this and other IBM publications can be obtained through your IBM representative or
the IBM branch office serving your locality.
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