Product Overview
Philips 82S123/BEA Bipolar PROM - 32 x 8 Bits in a 16-Pin DIP, Thailand Marked
Condition
Used, and sold untested. The black plastic 16-pin DIP body is clean and in good physical state, with the Philips shield logo crisply printed alongside 82S123/BEA and a second code line reading C7B9740D DKB. THAILAND is printed down the left of the body as a stacked two-column block, next to a small triangle mark. All sixteen leads are present, straight and in line; the plating reads dull mottled grey in these photos, with darker deposits at some of the bends and tips. We see no solder tails or clipped ends, which is consistent with a device pulled from a socket or never installed at all, and we do not read it as a sign of anything wrong. The pink antistatic material in the photographs is our photo bench, not the packaging, and the ruler in frame is there for scale only. This PROM is not tested, read back or verified here, so the photos are the spec.
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Product Overview
The Philips 82S123 is the classic 32-word by 8-bit bipolar PROM, the small fuse-programmable memory that sat quietly in address decoders, character generators, state machines and boot vectors through the whole TTL era. Thirty-two locations, eight bits wide, in a through-hole 16-pin dual inline package that drops into any 0.3-inch socket. The /BEA suffix and the C7B9740D DKB code line are printed on the top of this exact piece, alongside the Philips shield logo and a THAILAND country marking. Bipolar PROMs are one-time programmable by design: once the fuse links are blown they hold their pattern without power and cannot be erased. Because this one is sold untested, we cannot tell you whether it is blank or already carries someone's pattern from decades ago. Anyone with a programmer can read it in a few seconds and find out.
Key Features
- Part number as printed on the body: 82S123/BEA
- Manufacturer: Philips, shield logo printed on the package
- Memory organization: 32 words x 8 bits
- Type: bipolar programmable read-only memory, one-time programmable
- Package: 16-pin plastic dual inline, through-hole
- Second code line printed on the body: C7B9740D DKB
- Country marking on the body: THAILAND
- Leads: all 16 present and straight; plating reads dull mottled grey with darker deposits at some bends
- Access time, logic levels and output configuration: not confirmed here - verify against the 82S123 datasheet before use
- Programmed state: not confirmed - read the device before you rely on it
Applications
- Restorer bringing a late-1970s or 1980s arcade board or minicomputer card back to life and needing the original 32x8 PROM footprint rather than an adapter
- Bench engineer burning a small address decode or chip-select map for a homebrew Z80 or 6502 system
- Repair technician replacing a suspect character-generator or state-machine PROM in legacy industrial control gear
- Electronics instructor demonstrating fusible-link memory to students who have only ever met flash
Frequently Asked Questions
Is this PROM blank, or is something already programmed into it?
We do not know. It is sold untested, and a bipolar PROM gives no outward sign of whether its fuse links are intact. Read it on a programmer that supports the 82S123 family before you plan around it.
Can I erase it and start over?
No. Fusible-link bipolar PROMs are one-time programmable - blown links do not come back. If it turns out to be already programmed and the pattern is not what you need, it becomes a study piece rather than a blank.
What do the markings on the body actually say?
Reading the top of the package: the Philips shield logo, then 82S123/BEA, then C7B9740D DKB on the line below, with THAILAND printed vertically down the left side and a small triangle. We are quoting what the camera shows rather than interpreting the code line.
Will it fit a standard socket?
It is a 16-pin dual inline package with all leads straight and unbent, so it seats in an ordinary 0.3-inch 16-pin DIP socket without straightening. Pin function and orientation should be checked against the 82S123 datasheet before you power anything.
It is used and untested - what am I really buying here?
One specific chip, the one in these two photographs, described down to the code line on its lid. You are taking on the electrical unknown: we have not powered it, read it or verified its contents, so what you see in the images is the whole of what we can promise. What you get in exchange is a part identified honestly instead of a mystery pull from a bag of forty, with a no-hassle satisfaction guarantee behind it if it is not what you expected. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
A fusible-link PROM keeps whatever pattern it was handed, and this one is not telling. Put it on a programmer and find out what thirty-two words someone in Thailand sent out into the world in a black plastic package - then decide whether to keep them or write your own.
