Cancellation and Retirement
Unisys cancelled further V series hardware development in 1991, and support ended in 2004. In the B4900 and later machines, integer operations of 10 digits or less were now handled in a parallel way; only longer operands continued to use the serial method. And all floating point operations were limited to 17 digits of precision. Later Medium Systems machines added an accumulator register and accumulator/memory instructions using 32-bit, 7-digit integers and 48-bit or 80-bit floating point values, all aligned on 16-bit word boundaries.
Read more about this topic: Burroughs B2500
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