What is this?

[stevejam]

Similar style chips are used in this SCM Marchant 1 calculator here -

https://www.oldcalculatormuseum.com/scmmarchant1.html
(scroll down for info on these chips)

The Uniquely Packaged AMI Chip set installed in special sockets made by Litton Industries

The operator's manual for the Marchant I claims that the AMI chips each contain the equivalent of over 1,000 discrete transistors. The chips are packaged in a unique fashion. As far as the author is aware, this particular style of packaging was only used in SCM's initial line of MOS/LSI calculators as mentioned above, as well as the Marchant I and its later version, the F-80 (more on the F-80 later in this exhibit). This style of IC packaging has not been encountered on any other calculator manufacturer's machines, and appears to be completely unique to SCM's calculators.

The AMI Chip set Leadless Chip Carrier (LCC) Packages (Left-479A, Right-480B)
These devices are later than those in the exhibited calculator with date codes in February, 1972, and May, 1971
Sincere thanks to Warren & Amy Parks for their donation of the Marchant I logic board that contains these devices

The chip packaging consists of a rectangular ceramic base that contains a circular depression in the center, with a gold base metal in the bottom of the depression. The IC chip is bonded to this base. Arrayed around the circular inset where the chip is mounted, there are 40 gold contact points, with gold traces leading away from them to one edge of the ceramic base. Tiny gold wires are bonded from contact points on the chip to the contact points arrayed around the inset of the package, providing connections from the chip to the 40 fingers at the edge of the chip. A gold metal lid is then sealed over the chip using a low melting point glass to seal the chip and its delicate connections underneath. This method of packaging a chip is typically called a "Leadless Chip Carrier" (LCC). The LCC measures approximately 3 1/2" x 1 1/4", and plugs into a complex (and likely rather expensive) socket mounted on the main logic board. The socket provides a secure connection between the traces on the edge of the LCC to the rest of the circuitry using springy gold-plated contacts, as well a pair of pressure springs that help secure the LCC in the socket. The leadless chip carrier socket is made by Litton, a company that specialized in aerospace, military and defense electronics (and also ended up in the calculator business when it purchased the Monroe Calculating Machine Company in 1958). This LCC packaging and socket was used for both the AMI- and TI-made chips.

[Williac]

I actually have a couple of blank packages for these. Will see if I can post a pic or two later.