DS25 Modell B 500W PSU 30-10047-01 Single- and double-precision fast floating-point hardware op- tion. This option is one quad module mounted adjacent to the CPU. Performs hardware operations on 32-bit and 64-bit floating-point numbers. Provides up to 17 digits of precision. Provides integer-to-floating-point conversions. Executes in- structions approximately six times faster than the KEF 11-AA. DS25 Modell B 500W PSU 30-10047-01-AA Single- and double-precision floating-point option. The microcode to implement this option resides on two chips in one 40-pin package. Performs microcode operations on 32-bit and 64-bit floating-point numbers. Provides up to 17 digits of precision. Provides integer-to-floating-point conversions. Mounts on the CPU board. DS25 Modell B 500W PSU 30-10047-01-BB Commercial instruction set. Implements a set of 27 commer- cial instructions on a variety of data types, including character strings, packed decimal, and numeric formats. Mounts on the CPU board. DS25 Modell B 500W PSU 30-10047-01-DC 32-Kbyte CMOS static random access memory with onboard battery backup. This battery backup provides minimum data retention time of 50 days. DS25 Modell B 500W PSU 30-10047-01-LF 128-Kbyte dual-height MOS memory MSV11-LK 256-Kbyte dual-height MOS memory DS25 Modell B 500W PSU 30-10047-01-PK 256-Kbyte parity MOS memory MSV11-PL 512-Kbyte parity MOS memory