Product Overview
Intel D27C256 Non-Volatile Memory IC - 32K x 8 UV Erasable PROM
Condition
Used. Programmed previously but never installed into equipment. Evaluation: Visual inspection only. Function testing not performed. Markings legible: D27C256 -150V10. Sold each.
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Product Overview
Built for non-volatile firmware storage, Intel D27C256-150V10 provides 256 kilobits of ultraviolet-erasable programmable read-only memory organized as 32,768 bytes by 8 bits. Fabricated with Intel CHMOS technology, it delivers 150-nanosecond access speeds with low power consumption across standard 5-volt operation. The circular optical quartz window seated in the ceramic dual in-line package allows stored data to be cleared under high-intensity ultraviolet light for reprogramming.
Key Features
- 256 Kbit non-volatile memory organized as 32K x 8
- 150 ns maximum access time
- 5V DC operating voltage with 10% power supply tolerance
- CHMOS technology for reduced operational power draw
- Integrated quartz window for UV light erasure
- Standard 28-pin ceramic dual in-line package with 0.600-inch row spacing
Applications
- Restoring system firmware on vintage arcade game boards, digital synthesizers, and retro microcomputers
- Replacing corrupted program ROMs in legacy industrial controls and automated manufacturing equipment
- Flashing custom operating code or diagnostic routines on retro computing test benches
Frequently Asked Questions
Can this EPROM be reprogrammed immediately?
Because this chip was programmed previously, it requires clearing under an ultraviolet EPROM eraser before writing replacement code. Exposing the internal die to UV light through the quartz window returns memory cells to a high logic state (FFh) for subsequent programming.
What device programmer is required to write code to this chip?
Standard universal EPROM programmers that support 27C256 devices and standard 28-pin DIP packages can read and program this chip when configured for the Intel D27C256-150V10 algorithm.
What condition is this EPROM in?
This chip was programmed previously but never installed into equipment. Evaluation is visual inspection only; function testing and blank verification have not been performed. Erasing stored code and writing replacement firmware are handled by the buyer.
Nothing anchors a restoration quite like the pale glow of a quartz window holding real machine code. Drop it under the UV lamp, burn your hex file, and watch vintage iron come back to life.
