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UNIVAC 1100/2200 series
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UNIVAC 1100/2200 series
The UNIVAC 1100/2200 series is a series of compatible 36-bit computer systems, beginning with the UNIVAC 1107 in 1962, initially made by Sperry Rand. The series continues to be supported today by Unisys Corporation as the ClearPath Dorado Series. The solid-state 1107 model number was in the same sequence as the earlier vacuum-tube computers, but the early computers were not compatible with their solid-state successors.
Instructions are 36 bits long with the following fields:
The 128 registers of the high-speed "general register stack" ("integrated circuit registers" on the UNIVAC 1108 and UNIVAC 1106 models), map to the current data space in main storage starting at memory address zero. These registers include both user and executive copies of the A, X, R, and J registers and many special function executive registers.
The table on the right shows the addresses (in octal) of the user registers.
There are 15 index registers (X1 ... X15), 16 accumulators (A0 ... A15), and 15 special function user registers (R1 .. R15). The four J registers and three "staging registers" are uses of some of the special function R registers.
One interesting feature is that the last four index registers (X12 ... X15) and the first four accumulators (A0 ... A3) overlap, allowing data to be interpreted either way in these registers. This also results in four unassigned accumulators (A15+1 ... A15+4) that can only be accessed by their memory address (double word instructions on A15 do operate on A15+1).
Prior to the UNIVAC 1107, UNIVAC produced several vacuum-tube-based machines with model numbers from 1101 to 1105. These machines had different architectures and word sizes and were not compatible with each other or with the 1107 and its successors. They all used vacuum tubes and many used drum memory as their main memory. Some were designed by Engineering Research Associates (ERA) which was later purchased and merged with the UNIVAC company.
The UNIVAC 1101, or ERA 1101, was a computer system designed by ERA and built by the Remington Rand corporation in the 1950s. It was never sold commercially. It was developed under Navy Project 13, which is 1101 in binary. The UNIVAC 1102 or ERA 1102 was designed by Engineering Research Associates for the United States Air Force. The 36-bit UNIVAC 1103 was introduced in 1953 and an upgraded version (UNIVAC 1103A) was released in 1956. This was the first commercial computer to use core memory instead of the Williams tube. The UNIVAC 1105 was the successor to the 1103A, and was introduced in 1958.
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UNIVAC 1100/2200 series AI simulator
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UNIVAC 1100/2200 series
The UNIVAC 1100/2200 series is a series of compatible 36-bit computer systems, beginning with the UNIVAC 1107 in 1962, initially made by Sperry Rand. The series continues to be supported today by Unisys Corporation as the ClearPath Dorado Series. The solid-state 1107 model number was in the same sequence as the earlier vacuum-tube computers, but the early computers were not compatible with their solid-state successors.
Instructions are 36 bits long with the following fields:
The 128 registers of the high-speed "general register stack" ("integrated circuit registers" on the UNIVAC 1108 and UNIVAC 1106 models), map to the current data space in main storage starting at memory address zero. These registers include both user and executive copies of the A, X, R, and J registers and many special function executive registers.
The table on the right shows the addresses (in octal) of the user registers.
There are 15 index registers (X1 ... X15), 16 accumulators (A0 ... A15), and 15 special function user registers (R1 .. R15). The four J registers and three "staging registers" are uses of some of the special function R registers.
One interesting feature is that the last four index registers (X12 ... X15) and the first four accumulators (A0 ... A3) overlap, allowing data to be interpreted either way in these registers. This also results in four unassigned accumulators (A15+1 ... A15+4) that can only be accessed by their memory address (double word instructions on A15 do operate on A15+1).
Prior to the UNIVAC 1107, UNIVAC produced several vacuum-tube-based machines with model numbers from 1101 to 1105. These machines had different architectures and word sizes and were not compatible with each other or with the 1107 and its successors. They all used vacuum tubes and many used drum memory as their main memory. Some were designed by Engineering Research Associates (ERA) which was later purchased and merged with the UNIVAC company.
The UNIVAC 1101, or ERA 1101, was a computer system designed by ERA and built by the Remington Rand corporation in the 1950s. It was never sold commercially. It was developed under Navy Project 13, which is 1101 in binary. The UNIVAC 1102 or ERA 1102 was designed by Engineering Research Associates for the United States Air Force. The 36-bit UNIVAC 1103 was introduced in 1953 and an upgraded version (UNIVAC 1103A) was released in 1956. This was the first commercial computer to use core memory instead of the Williams tube. The UNIVAC 1105 was the successor to the 1103A, and was introduced in 1958.
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