A very very rare find - SMS300

[CPUShack]

Its not well known but the Signetics 8X300 was originally the SMS300, a design that Signetics had fab'd for SMS (Scientific Micro Systems Inc ), and then later bought.

8X300s can be found, in a variety of packages, but has anyone ever seen a SMS300?

I have not seen one until today
Recovered from a scrap lot.
A very special chip in a very cool package

[mavroxur]

Nice!

[Neon_WA]

very nice find mate.. and pretty

I bet SMS kicked themselves after a few years selling the rights to Signetics

[gshv]

I saw it in a lot of chips, but didn't know that it's a processor. Anyway, great find, and the chip looks great.

Gennadiy

[Marcin]

[smithy]

Cool chip and in good condition too - even better

[whelenfan]

very cool indeed! congrats!

[magictom]

[jrmunro]

I was looking at that buy also but didn`t know what they were. Nice chips.

[susl45]

[CPUShack]

helps that I had recently wrote an article on them

[yk]

very very nice! I looked for this picture for a long time, but only find it in 1976' Digest.

[CPUShack]

[yk]

more about it : (year 1976)
Scientific Micro Systems has improved the processing speed of its bipolar microprocessor and has introduced two new I/O interfacecomponents.The SMS 300 central processing unit (CPU) now provides minimum system cycle time of250 ns. This is the total time required to fetch, decode and execute any instruction, SMS says. When the company's line of MicroController systems wer~ introduced in 1974, the device had a 300 ns cycle time. SMS says the faster cycle time permits direct control of double-density floppy discs. The processing power of the SMS 300 allows firmware cont~ol of such functions as calculation of CRC and disc formatting, which normally require additional integrated circuits. The SMS 300 CPU treats I/O registers and has the ability to directly manipulate and test groups of bits within 8-bit bytes in a single cycle.The two new I/O units are the SMS 362 and SMS 363 IV (interface vector) bytes. Both feature external clocking and input latches which operate asynchronously with CPU timing. This eliminates the need for additional MSI edge-triggered latches when capturing transient data, the company says. The SMS 362 and 363 components enable the CPU to be directly interfaced with up to 4096 I/O lines. The SMS 362 has tri-sta"te outputs, while the 3MS 363 is an open collector device. The new SMS components are available within 30 days ARO. In quantities of 100, prices are $90 and $8 each for the CPU and the IV bytes, respectively.

[Neon_WA]

http://bitsavers.trailing-edge.com/pdf/microcomputerAssociates/Microcomputer_Digest_v02n12_Jun76.pdf