UNIVAC 1108

The UNIVAC 1108 was the second product line in the series of the UNIVAC 1100/2200, which was introduced in 1964. In contrast to the UNIVAC 1107 1108 magnetic memory based on the thin film memory has been replaced by integrated circuits in the UNIVAC. In addition, smaller and faster circuits have been used for the main memory.

In addition, two other architectural changes were introduced:

• Two 18-bit base register were introduced, one for instructions and one for data storage. As a specialty the register allowed a dynamic reallocation of memory addresses. If a program is written into and read in a storage area, the instructions and data in this memory area could be re- placed.
• Additional hardware commands for double arithmetic and load, store and comparison operations for double words.

As the first UNIVAC was delivered in 1108, in 1965, was also the UNIVAC II 1108, also under the name UNIVAC 1108A known distributed. In contrast to the Univac 1108 was the Univac 1108A a multiprocessor system.

Although in 1964 an internal study predicted that only about 43 pieces could be sold machines were produced in the whole 296.

When the Sperry Corporation surrendered to main memory as a semiconductor memory, diegleiche machine under the name UNIVAC was sold 1100/20.

Specifications

• Four memory banks, each Ki 64 words, each word having 36 bits
• Two independent Ein-/Ausgabe Controller ( IOC)
• Computing power of about 1.5 MIPS. Today's PCs in comparison: up to 15,000 MIPS at dual processors

Thus, the UNIVAC could perform three programs in 1108 and two peripheral controller at the same time.