Multiples of 14: 14, 28, 42, 56, 70, 84, 98, 112, 126, 140, 154, 168, 182, 196, 210, 224, 238, 252, 266, 280

Display hardware needs to have a pixel counter that reacts when a limit is reached. It is easier to detect that limit if the binary pattern of it consists of a small number of digits that need to be matched followed by a larger number of zeros. 640 is a good candidate that is close to 675: you only need to examine 3 bits to produce a counter that counts up to it. Conclusion: 80/132 character come from the age of punch cards, 24/25 lines due the 4:3 dimensions of common CRTs Perfect for use in the bathroom, our bespoke glass shelves are multi-functional, versatile, durable and low maintenance. Display an array of products, create a feature element in your room or simply use them for solid storage, you can’t go wrong with a timeless glass shelving application. Multiples of 11: 11, 22, 33, 44, 55, 66, 77, 88, 99, 110, 121, 132, 143, 154, 165, 176, 187, 198, 209, 220 Since the 1964 2260 Model 3, 80 characters was the standard for mainframes and the goal for everything else.

Flat Bar

The whole TV system is made to display continuous greyscales/colours as they appear in real life pictures, not sharp contrast as needed for text display. That's why electronics, coils, and tube coating for dedicated text displays differ from such made for TV purpose. A TV set, including the full path can barely produce 40 characters per line (6/7px per char) in acceptable quality.

If most used is by computing power, or amount of users, then a single /370 installation might outclass a hundred PDPs. It's much like baking a peanut cake takes many more peanuts than one with a coconut filling takes coconuts :) The 80 character came from IBM's extended punch card design of ~1930. The 'original' Hollerith card of 1890 had already evolved from 24 columns (characters) to 45 while keeping the basic structure. Still customers continued to ask for ever more storage capacity (*5). So one of the engineers Mr. Watson assigned the task came up with the idea of rectangular holes instead of the round one used up until then. Rectangular holes allowed (almost) doubling the density (*6) form 45 to 80 symbols while keeping the size of the card constant. This happened to be an important decision, as it only required modification on parts of the existing designs, while most of the production chain from paper manufacturing over card storage up to the mechanical parts of processing could be kept the same. Just punch thorn size and timing had to be modified (*7). Also around 1930 Remington doubled the capacity by keeping the round Hollerith holes, but storing two characters per column (90 characters per card). There were other formats as well. At the end of the 1940s (partly due the war) IBM's 80 column card was the industry wide accepted standard. Multiples of 17: 17, 34, 51, 68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255, 272, 289, 306, 323, 340Memory for holding the text in a glass terminal like the 3300 was generally constructed using shift registers. These tended to be small, so the memory for a "screen of text" required many chips. Using fewer chips was better than more, but there was no strong requirement to use a particular number of them unless you were going for the lowest possible cost.

TV's became quite blurry approaching 132 (B&W@625px) char so that seems to be the hardware maximum width upper limit. Multiples of 8: 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160 Many early manufacturers did first ship with terminals with less then 80 characters and 24 lines. Sometimes even in large numbers.

Tee Bar

Multiples of 16: 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240, 256, 272, 288, 304, 320 With 640 pixels being a natural, easy-to-implement screen width for systems using bitmapped frame buffers, those systems had another good reason: it made the text display logic easier to have 8 pixel wide characters, because then to display a row of pixels for a string you could just copy a byte from the font memory into the framebuffer and increment your pointer to move on to the next character, which is much easier than any alternative font width. Since an IBM Electric was used as genuine terminal for the very first DEC machine ( PDP-1), it could be argued that DEC's 80 column orientation is originated here :)) While this was occurring, similar forces were acting on the printer market. The 132-column standard remained a significant force into the 1970s; IBM's printers starting with the 1403 all used this as their standard format, and when the first low-cost printers emerged, notably the Centronics 101, it used 132 columns. Our friendly team will be happy to discuss any of your flat bar requirements, so call today on 0800 123 70 10 for advice and our latest prices. Alternatively, drop us a line at: [email protected]

characters is, as described in the comments, very close to the width you can fit on standard paper sizes in portrait orientation. Most typewriters and "letter quality" printers used either Courier Elite (12CPI) or Pica (10CPI). As long as you used reasonable margins you could fit a line of text of either of those onto an 80 character display, so it is particularly useful for word processing, and again you can easily get a printer that can print whatever you see on screen. Multiples of 19: 19, 38, 57, 76, 95, 114, 133, 152, 171, 190, 209, 228, 247, 266, 285, 304, 323, 342, 361, 380Rectangular hollow section generally available in 6.000 Metre lengths and commonly in Grades T304, T316 & Grade T430; All in a wide variety of finishes. The well known (*11) Datapoint 2200 did support as well 12 lines of 80 character. The similar but earlier Cogar C4) did only 8 lines with 32 characters ... one reason why it never got as popular. With 5 pixels to play with things become a bit better, but a major improvement in legibility happens at 6 pixels; along with spacing this means you can fit about 91 characters in a display. Metal Supplies™ supply metal box section products across the UK and internationally. We are a leading provider of metal and metal services to both domestic and commercial customers, including a comprehensive range of stainless steel products. If you’re looking for high-quality, steel hollow section products available for immediate dispatch, Metal Supplies™ are the company you need and we’re happy to help with your project, whether you’re a business or domestic customer.