pc mouse Technology

IBM's PS/2 was designed to remain software compatible with their PC/AT/XT line of computers upon which the booming PC clone market was built, but the hardware was quite different. PS/2 had two BIOSes — one was named ABIOS (Advanced BIOS) which provided a new protected mode interface and was used by OS/2; the other was named CBIOS (Compatible BIOS) which was included in order for the PS/2 to be software compatible with the PC/AT/XT.The IBM Personal System/2 line introduced the Micro Channel Architecture (MCA for short), which was technically superior to the ISA bus and allowed for higher speed communications within the system. The MCA bus featured many advances that would not be seen in other interface standards until several years later. Transfer speeds were on par with the much later introduced PCI bus standard. MCA allowed one-to-one, card to card, and multi-card to processor simultaneous transaction management which is a feature of the PCI-X bus format. Bus mastering capability, bus arbitration, and true plug-and-play BIOS management of hardware were all benefits of the MCA bus. Despite all of these technical advantages, the Micro Channel Architecture never gained wide acceptance outside of the PS/2 line due to IBM's anti-clone practices and incompatibilities with ISA. IBM offered to sell a Micro Channel license to anyone who could afford the royalty, but they not only required a royalty for every MCA-compatible machine sold, but also a payment for every IBM-compatible machine the particular maker had ever made in the past.^{[citation needed] concats 00923224479031}