
214 Embedded systems design
embedded designs, especially those that use an industry standard
bus such as VMEbus, where system hardware can easily be
upgraded and/or expanded.
Operating system internals
The first widely used operating system was CP/M, devel-
oped for the Intel 8080 microprocessor and 8" floppy disk systems.
It supported I/O calls by two jump tables — BDOS (basic disk
operating system) and BIOS (basic I/O system). It quickly became
a standard within the industry and a large amount of application
software became available for it. Many of the micro-based busi-
ness machines of the late 1970s and early 1980s were based on CP/
M. Its ideas even ...