UNIVAC printed circuit boards.
The coin is an Australian 10 cent piece, diameter 23.60mm.
Photo: Bryan Sullivan.
Honeysuckle Creek Hardware
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UNIVAC printed circuit boards. The coin is an Australian 10 cent piece, diameter 23.60mm. Photo: Bryan Sullivan. |
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UNIVAC printed circuit board. The above PCB is a type 7003691 which is a pulse driver for the magnetic core memory. These drivers provided the pulse current for the x and y addressing and the read and write sense lines. Note the coloured bands around the resistors which indicate their resistance value in ohms. e.g. the values of the two large resistors between the green toroid inductors are: (upper) 1000 ohms, (lower) 560 ohms. The gold band implies a tolerance value of ± 5% of ohmic value. Photo: Bryan Sullivan. |
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UNIVAC printed circuit board. The reverse side of the type 7003691. Note the heavy ‘printed’ wiring for the substantial drive currents. Also note some printed wiring on the component side. Photo: Bryan Sullivan. |
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UNIVAC printed circuit board. The above PCB is a type 250420 which has four separate NAND logic gates. These PCBs provided many functions of control logic for timing chains, input/output controllers, arithmetic units and instruction and execution sequences at the machine code level. Photo: Bryan Sullivan. |
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UNIVAC printed circuit board – the reverse side of the type 250420. All stages of the manufacture of these PCBs were fully automated from the design and layout to the discreet component placement, circuit soldering, epoxy resin dipping and testing. Note the gold plated pins. Photo: Bryan Sullivan. |
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The above PCB is a type 7002000 which consists of two separate single flip-flops each with multiple input gates. (see logic diagram below). Photo: Bryan Sullivan. |
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This diagram is from the UNIVAC CP 642B Functional Schematic manual. It is portion of a page showing the logic for the R-Register, bits 00 thru 05, which use the type 7002000 PCB. This page is one of over three hundred functional schematic logic diagrams for the CP 642B computer. Thanks to Geoff Seymour for conserving the UNIVAC manual and for copying this page. |
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The reverse side of the PCB type 7002000. Photo: Bryan Sullivan. |