Return ULA Uncommitted Logic Array. A chip containing a large number of electronic gates which is manufactured up to the last couple of layers - the ones that join the gates into a working circuit. Customers then use specialist software to assist them to translate what they would like the chip to do into the required connection patterns. The final layers are then added to the chip by the manufacturer. The ULA is a 'semi-custom' Asic.
Computer memory is made up of many locations, each holding one 'bit' of data.
The computer needs a unique 'address' for each location so that the microprocessor knows exactly where to find it, just as each house in a housing estate needs an address so that the postman can find it. The newer microprocessors, such as the 80386 and 80486, can generate a huge range of different addresses, but of course this doesn't mean that all possible addresses lead to a memory chip, just as knowing all the house numbers on a building site doesn't mean all the houses are built. A 'memory map' is a diagram listing all the addresses that a microprocessor can generate and showing which ones lead to physical devices installed in the system in question. Return UNIX, Unics Uniplexed information and computing service. An operating system written by Ken Thompson of Bell Labs which was a slimmed-down version of the earlier Multics system.