UNIVAC Type 1206 1212 1218* 1213 1219B 1230 1289 3250 Mil Type AN/USQ-17 CP-642A CP-642B CP-667 CP-789 CP-808 CP-848 CP-855 CP-890 AN/UYK-7 1st Delivery fall 1958 about 1960 4/26/1963 7/20/1964 4/1/1963 4/14/1967 5/25/1965 7/30/1965 6/7/1967 3/25/1970 Customer BUSHIPS BUSHIPS BUSHIPS NEL Navy USMC BTL NASA USN-SSM NAVSEA Total Built 6 17 239 3 326 19 367 120 164 1000+ Nick Name Q-17 NTDS 20B UYK-5 TYK TALOS*** C-3**** Specification DS4601 DS4654 DS4781 DS4769 DS4836 comments Note 1 Note 2 Note 3 Note 4 Power 2500 1500 1400 2400 Weight 2400 775 1000 1800 Module Size 1.5x2.5" 1.5x2.5" 1.5x2.5" 1.5x2.5" 1.5x2.5" 1.5x2.5" 3.3x3.5" 3.3x3.5" Module count 1600 1500 Memory Size 16k 32k 32k 131k 16k 32k 32k 32k 64k 48k+ Word Length 30 30 30 30/36** 18 30 18 30 30 32 Memory Speed 8 usec 8 usec 4 usec 4 usec 4 usec 2 usec 2 usec 2 usec 1.8 usec 1.5 usec Note 1 The Navy's first standard computer for the Naval Tactical Data Systems Note 2 This computer ISA spawned the Univac commercial 490 series of computers Note 3 This computer ISA spawned the Univac commercial 418 series of computers Note 4 Second generation Naval Tactical Data Systems standard computer Note 5 Inputs to fill in any blanks are welcome. * This design was originally conceived as a computer unit tester before becoming the heart of the Navy's logistics system. ** a flip of a switch would cause operation in 30 bit or 36 bit mode. *** Variations were used to launch Talos, Tarter, and Terrier missles; ship to air and ship to shore devices. **** The C-3 became the Trident Submarine navigation core, guiding submarines under the polar ice cap. Donated by Lowell A. Benson Univac Unisys employee 7/60 to 3/'94 1/17/2006, UNIVACequip.xls Orig URL: http://www.usfamily.net/web/labenson/Legacy_files/UNIVACequip.pdf --- http://ed-thelen.org/comp-hist/univac-ntds.html The 642A was all germanium transistors. The 642B used silicon. Both had a 1 MHZ clock, divided into four phases. Instructions were from 4 microsec. to 48 microsec., depending on the operation. Memory was ferrite core. Cycle time was 8 microsec., 4 to do the destructive read, and another 4 to write back in from of the Z register. Both had an unusual hardware square root routine. The op code was for divide (23), but it extracted the root if the k register was 7. The X register did an elaborate shift process, which took 48 microseconds. You can't really apply core technology criteria to these old Univacs. In a way, every manufacturer had a core technology, but things were still evolving from some really primitive beginnings, so I wouldn't think of the differences as such. The distinction between a 642A (Univac 1206) and a 642B (Univac 1208) was pretty slight. The biggest difference was the change from germanium to silicon transistors. As the germanuim transistors were non-standard, the change probably save Univac significant cost per unit. The old germanium transistors were housed in a grain of wheat sized casing, with fine insulated wired coming out one end. The transistor had to be mounted in a nylon clip, and then each wire had to be stripped and hand inserted into its hole in the pc board. Has to be labor-intensive. Both computers used PNP transistors, so a logic Low was true, and a High was false.TTL was hard to get used to after I got out of the Service. The other differences were small. The 642A had more elaborate circuitry for memory. There were manual adjustments for the X, Y and Z drive currents. The 642B had a Z current adjustment only, as I recall. The 642B could have its I/O channels sped up from 125 Kword/sec. to double that rate. Some problems apparently crept in, as there was an engineering kludge in the ODR timing circuit. It was two flip-flops that had been added. One was named Finkbine, and the other Gomez. I noticed that the newer Mil-Standard 802C prints omitted the names. It just popped into my head that the logic in the 642A was basically all NOR gates, while the 642B was all NAND gates. The prints were reprenented in something called bubble logic, where each element was a circle. 802C was lots easier to interpret. Without prints and such, that's about all I can recall of these computers. Hope this helps, Bill Bennett