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1 4 8 12 16 18 24 26 31 32 36 48 60 64 128 256 512
16 32 64
Floating point precision
×½ ×1 ×2 ×4
Floating point decimal precision
32 64 128

In computer architecture, 18-bit integers, memory addresses, or other data units are those that are at most 18 bits (2.25 octets) wide. Also, 18-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size.

18 binary digits have 262144 (1000000 octal, 40000 hexadecimal) distinct combinations.

18 bits was a common word size for smaller computers in the 1960s, when large computers often used 36 bit words and 6-bit character sets were the norm.

Example 18-bit computer architectures[edit]


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151 news items

Electropages (press release)
Wed, 02 Apr 2014 06:41:15 -0700

The Analog Devices AD7960 and AD7961 18- and 16-bit, 5MSPS charge redistribution successive approximation (SAR), analog-to-digital converters (ADCs). The SAR architecture allows unmatched performance both in noise and linearity. The AD7960/61 ...
EE Times
Tue, 22 Apr 2014 11:57:22 -0700

With regard to today's announcement, what the folks at Altera have done is really rather clever. They already have a hardened variable-precision fixed-point DSP block that can support standard-precision (18-bit) or high-precision (27-bit) modes. They ...

Electronic Design

Electronic Design
Wed, 23 Apr 2014 11:16:31 -0700

Capable of supporting WQVGA and QVGA format displays (with resolutions up to 512 x 512 pixels), the FT801 supports 18-bit RGB color with 2-bit dithering for improved color tone. Running off a single 3.3-V supply, the device comes with different objects ...

ThomasNet News (press release)

ThomasNet News (press release)
Mon, 21 Apr 2014 16:15:00 -0700

The dataTaker DT80M provides precision real-time recording, taking measurements at 18-bit resolution, with a rugged design and construction providing reliable operation under even extreme conditions. Intelligent alarming capability: The built-in 2G/3G ...

WebWire (press release)

WebWire (press release)
Wed, 23 Apr 2014 06:18:45 -0700

This ultra-fast ADC, with support of oversampling to allow 16-bit resolution at 20ksamples/s and 18-bit at 1.2ksamples/s, enhances precision, making these devices ideal for applications such as sensor data processing, healthcare, power meters, and ...
Tue, 01 Apr 2014 02:04:21 -0700

Bei der Schaltung in Bild 1 handelt es sich um ein komplettes, rauscharmes Datenerfassungssystem (5 MSample/s; 18 Bit), das 122 mW aufnimmt und eine hohe Genauigkeit bietet. Referenz, Referenzpuffer, Treiberverstärker und A/D-Wandler bilden eine ...
Al Jazeera America
Fri, 18 Apr 2014 02:00:40 -0700

My wife and I have a 7-year-old who reads the way a chain-smoker smokes. He can put on a soccer uniform while turning the pages to “Captain Awesome”; we've had to forbid him to bring “Encyclopedia Brown” to the dinner table. Most of the time, he's as ...

ThomasNet News (press release)

ThomasNet News (press release)
Thu, 10 Apr 2014 05:34:40 -0700

The ECM-DX2 supports onboard DDR2 memory that supports up to 32bit 1GB and supports single channel 24-bit LVDS (optional 18-bit) as well as VGA+LVDS or VGA+TTL multi-display configurations. The I/O deployment includes 1 SATA II interface, 4 COM ...

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