"The usage of a single bus was quite a departure in terms of computer technology," according to the museum, "as many minicomputers at that time had a separate dedicated I/O bus. The designers at DEC could do without this separate bus by mapping all of the I/O requirements to addresses in memory so that no specialized I/O instructions were needed.
The PDP-11 could use several different kinds of peripherals, such as a disk drive that had as much as 2.5 megabytes of storage space. As well, it had dual 8-inch disk drives that could each store 256 kilobytes of information. It also had a tape drive. This version of the computer "is running the RT-11 single-user real-time operating system," according to the museum.
July 4, 2011 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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