No, the target market for the IBM-PC was the office desk top. . . the IBM mainframe shops were companies who leased their products and the leasing agents were not at all interested in selling stand-alone micro-computers. In fact, the PC came out of the TYPEWRITER division, not the computer division and the computer division was singularly NOT HAPPY.
They looked on it as a competitor to their bailiwick and their terminal business, which were LEASE ONLY! They lobbied top management strongly to KILL the PC for a couple of reasons. . . primarily the OS was "not-IBM sourced" and the processors were also not IBM sourced. . . and, they claimed, it was redundant to their terminal business, which was quite profitable. "Besides," they claimed, "it would cannibalize the typewriter business."
After the release of the PC1, IBM's next project was the 5271, dubbed the PC/3270 which came bundled with a 3270 coax adapter card and terminal emulation software, which made it a drop-in replacement for a 3270 terminal.