|Monolithic Integrated Circuits|
Click photos to enlarge.
Click photos to enlarge.
|Texas Instruments SN514|
TI's SN51x series of RCTL logic chips, released in 1961, is widely recognized to be the world's first commercially available line of integrated circuits. 'SN' stands for 'Semiconductor Network', TI's nod towards the then-radical idea of combining multiple solid state devices into a single package. The SN51x series chips were manufactured from multiple transistor and diode dies, which were hand-wired together with thread-like interconnect leads inside the package. Constructing chips in this manner was both labor-intensive and expensive: early SN51x series chips sold for over $400 when first released.
These early ICs were primarily targeted towards the military and aerospace industry, and the SN514 (along with the SN510) were the first integrated circuits to orbit the earth. The earliest SN51x series chips were packaged in gold plated flat-packs. This example, a SN514 NOR/NAND gate made in November 1962, abandons the military gold package in favor of a more primitive looking 'block of carbon'-style enclosure.
|OKI Intel M85C154|
The Intel M85C154 is a special class of microprocessor known as a 'piggyback' CPU. Piggyback microprocessors are designed to act as a programming development tool and can be easily recognized by the presence of a top mounted socket. In use, the engineer would program a blank EPROM on a desktop computer with their test code, then insert the EPROM into the socket on the microprocessor so the code loaded inside could be tested. Once the code was tested and finalized, a cheaper one-time-programmable microprocessor with built in EPROM would be used in the final product.
The M85C154, an 8 bit CPU based on the Intel 8051, is fairly representative of a typical piggyback microcontroller. This device has a maximum clock speed of 22MHz and 16k of onboard ROM space. Additionally, the M85C154 can address up to 64K of program ROM through it's piggyback socket.
The CYM620 is a 1 megabit static ram module built around several leadless ICs mounted to a ceramic carrier. Four of these chips are 256k static RAMs, with the fifth being a decoder IC. The RAM units are grouped into a high and low pair, with the decoder reading the highest position address bit to determine which pair should be active. The TTL level inputs and outputs as well as the substantial hermetic packaging and wide temperature ratings make this a fairly robust memory IC.
The Amdahl 470A is an unusual LSI CPU component chip that was used in Amdahl's 5860 "supercomputer" mainframe. Amdahl was known for making air-cooled computers in a market dominated by water cooling, which resulted in their chips having a very unique construction. This chip is no exception, the top is dominated by a tall heatsink that would have poked into a forced air cooling channel when installed in a computer. During use, many such chips would be bonded into large arrays to construct a complete CPU. Note that this chip has a Fujitsu makers mark... Fujitsu was Amdahl's largest shareholder and eventually grew to own the company outright.
Amdahl's CPUs were so unique in appearance that many factory defects found their way into Lucite promotional paperweights that were produced by the company as sales samples and awards. This is the predominant form in which they are seen nowadays, as Amdahal's various air cooled chips never saw wide use outside the company.
Even in a world filled with bizzare Amdahal integrated circuits, the Amdahl 209 stands apart. The 209 is an LSI RAM IC in a complicated multi-chip package that was used in the Amdahl 5860 mainframe. This strange looking device is equipped with four distinctive aluminum cooling towers that are bonded to the chip with black epoxy. Each cooling tower is attached to a small square leadless IC, which is in turn bonded to a ceramic carrier. The leadless ICs are actually mounted to the carrier upside down... each has a gold cavity lid pressed tightly against the ceramic of the attached carrier. The four gold pads on the top of the 209 are actually heat spreaders, which connect directly to the underside of the four dies in each package.
Sadly the 209, like most Amdahl chips, has completely undocumented specifications. It is unlikely that these chips will ever see significant use in home-brew electronics projects, due to a lack of reliable connection data.
Not much is known about this mysterious MOS integrated circuit, other than that it was made by American Micro Systems and has a rather unique package style. The C1761 is packaged is a highly unusual 40 pin white ceramic leadless carrier with a round cavity lid. Earlier versions of this chip make use of a single layer gray trace leadless wafer, though sometime around 1973 AMI switched to a two-piece package which covered the traces in a second layer of ceramic. On the revised package the start and end pin numbers are conveniently printed on the side of the ceramic, and the base is keyed in such a way that prevents the chip from being inserted into it's socket backwards, a feature well ahead of it's time in 1973. We don't currently know the function of this IC, but it is likely a calculator chip or part of a calculator chipset given the manufacturer and package style. Strangely, the device has no insertion marks on the pins and was found in its original packaging, suggesting it was sold in the retail market.
The 1301, first released in 1969, is Intel's first mask rom, and is a compatible replacement for the groundbreaking 1701 UV erasable PROM. The 1301 is programmed at the factory with a metal mask, and was marketed as a low cost alternative to the 1701 for mass-produced items where it was not necessary for the chip to be erasable. The 1301 has a storage capacity of 256 bytes, or 2048 bits, and is also equipped with TTL compatible outputs. The example shown here is an earlier gray trace version, and has a date code from 1972.
The Intel 1601 is a 256 byte PROM that was designed to be drop-in compatible with Intel's 1301 metal mask ROM. A 1601 PROM has a significant advantage over the 1301; in that it can be programmed electronically by the end user without the need for factory-applied masks. Released in 1970, the earliest versions of this chip have opaque gold lids and gray trace ceramic packages. Later versions were simply 1701 UV erasable EPROMS with black vinyl covering up the UV erase window. Unfortunately the black vinyl cover, which has the part number printed on it, has long since fallen away on this example. With the cover removed late model 1601's are basically indistinguishable from an Intel 1701; it is likely that at least a few unidentified 1601s are sitting in chip collections around the world.
The 7M912, manufactured by Integrated Device Technology, is a 64k 9 bit CMOS static ram module constructed out of leadless SRAM chips bonded to a multi-layer ceramic substrate. THe 7M912 is built from nine separate IDT7197 SRAM integrated circuits, five of which are attached to the top surface of a ceramic carrier with the remainder being mounted to the underside. This integrated circuit is military rated, and is designed for use in harsh environments and high demand applications. The 40 pin package has been manufactured with extra-long leads, to prevent socket insertion from fouling the chips on the underside of the package.
IDT also made an 8 bit version of this chip, the 7M812. The 7M812 is identical in function to the 7M912, but only utilizes 8 IDT7197 SRAM ICs.
The Intersil 6100 is a 12 bit CMOS microprocessor first produced by Intersil in 1975. This relatively popular microprocessor family was manufactured in white, purple and plastic versions by both Intersil and Harris Semiconductor. The 6100 used the same instruction set as the popular PDP-8 series of minicomputers, and as a result was used in a number of late-1970s computer systems and logic controllers. One of the most iconic uses of the 6100 was as the CPU in Digital Equipment Corporation's line of DECmate personal computers. These machines took advantage of the 6100s instruction set to run reduced versions of the operating system used on some PDP-8 machines, although later DECmate computers included a Zilog Z80 for CP/M compatibility.
|Crossfiber Optical Switching IC|
Here is a device that, while not particularly vintage, is rather unusual; a Crossfiber optical switching chip. A crossfiber chip is a relatively new invention that is used for optical computing and routing. The IC has an array of pinhead mirrors mounted on 2 axis pivots, which can be moved electrically to bounce optical beams in different directions. In normal use, the IC would be mounted in a frame facing a fiber optic array; the mirrors could then be used to direct signals between adjacent fibers. This example contains a 16x16 array composed of 256 mirrors each about a millimeter in diameter; in effect forming a flip dot display intended to be gazed upon by a fiber optic bundle instead of human eyes. The unit shown here is a used laboratory sample and has no manufacturer markings, but we believe it was produced sometime around 2009.
Unfortunately, crossfiber IC's have yet to see widespread availability in the homebrew electronics community. Datasheets and example circuits are not readily available, and the home electronics experimenter is likely to find building a project around one of the these chips a challenging experience.
Devices included in this entry:
The 22V10B is a tiny programmable logic array (PAL), which contains a number of logic gates whose connections can be selected electronically. This chip was manufactured in a number of different package types, the example shown here contains a prominent glass window, which allows the chip to be erased with UV light and re-used. The window covers nearly the entire top surface of the chip, forcing the part number to be printed directly on the window's surface. ICs deployed into commercially manufactured devices typically omit the window to save costs, since the chip would never need to be reprogrammed outside of the factory. The gate array inside the 22V10 is wired in a cross connected matrix and can be programmed to emulate logic systems in the range of 500 to 800 separate gates. The 22V10 also makes use of "Macro Cells" across each of it's 10 outputs, which can be switched to become additional inputs on the fly. The 22V10B shown in the photo likely manufactured exclusively by Cypress Semiconductor.
|Fairchild FCCD 143D|
the FCCD 143D is a linear CCD, which is a light sensor that contains an array of photosensitive elements fixed end to end in a single line. Images are drawn by scanning a beam of light across the length of the CCD, capturing one line at a time. In this device, the light sensitive die has been packaged in a large 28 pin ceramic DIP with a glass cavity lid. The die for this device is much larger than what would be used in a conventional integrated circuit, and spans nearly the entire length of the device.
|Lucent T 7102A|
Little is known about the Lucent 7102A, other than that it is an X.25/X.75 protocol controller that was in use in telephone switching equipment in the early 1990s. The most distinctive feature of this IC is it's unusual pin configuration; the underside of the chip contains four rows of pins arranged into four 18 pin DIP arrays, eliminating the need for a custom socket.
|Westren Electric Integrated Circuits|
Devices included in this entry:
|Westren Electric Trimline Controller IC|
This bizarre looking hybrid integrated circuit is the controller used in many Western Electric Trimline phone handsets. The device makes use of a rather unusual construction technique in which multiple layers of glass with attached semiconductors and passives are bonded together and coated in resin. Numerous ball bond wires connect the different layers of the integrated circuit electrically. The passive resistors can be clearly seen through the top of the device as tracks of resistive material painted or etched onto the surface of the glass substrate.
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