| I want to introduct something about universal joint,u | | | | half-pixel positioning effectively doubled the horizontal |
| joint,cross axle,auto joint. universal joint,u joint,cross | | | | resolution to 14 dots , giving the characters very |
| axle,auto joint Place of Origin: China Zhejiang Model | | | | smooth outlines. (The initial sales literature referred to it |
| Number: different kinds Company Info Terms of | | | | as using a 7x9 matrix generated in a 9x15 dot |
| Payment: L/C,T/T,T/T ,L/C Minimum Order: 1000pcs | | | | character cell). |
| Packaging: Carton packing Delivery Lead Time: 30 | | | | All of this resulted in an extremely easy to read display |
| days Replacement parts for kinds of U Joints Fit to: | | | | with the dot-matrix nature, and the scan lines, almost |
| Nissan ,Toyoto , Honda, Mazda, ISUZU, Mitsubishi, | | | | invisible. |
| DAIHATSU,Hyundai , Kia,Daewoo ,Jeep, Ford , | | | | The keyboard had flat tops, similar to the HP 9800 |
| Chevrolet, Pontiac, Buick, GM , Audi , Volkswagen , | | | | series desktop computers rather than the curved |
| BMW,Mercedes Benz,Fit to: Nissan, Toyoto, Honda, | | | | contours now considered to be ergonomic. It featured |
| Mazda, ISUZU, Mitsubishi, Hyundai, Kia, Daewoo, | | | | three keypad areas: Alphabetic, numeric, and an array |
| Jeep,Ford, Chevrolet, Pontiac, Buick, GM, Audi, | | | | of cursor positioning and editing keys somewhat similar |
| Volkswagen, BMW, Mercedes Benz, Volvo, Chrysler, | | | | to modern PC keyboard layouts. There were also a |
| LADA, Eagle, and etc. universal joint,u joint,cross | | | | number of smaller function and feature control keys |
| axle,auto joint Send a message directly to this member | | | | arrayed in two rows above the normal keypad areas. |
| Place of Origin: China Zhejiang | | | | The keyboard chassis was separate from the main |
| The HP 2640A and other HP 264X models were | | | | body, connected via a thick cable. The keyboard used |
| block-mode "smart" and intelligent ASCII standard serial | | | | a bit-paired layout (similar to that on a Teletype |
| terminals produced by Hewlett Packard using the Intel | | | | machine) rather than the typewriter-paired |
| 8008 and 8080 microprocessors. | | | | arrangement on DEC's VT100. Although large, users |
| History | | | | loved the keyboard because "it had a key for |
| The HP 2640A was introduced in 1975, and used an | | | | everything". |
| Intel 8008 CPU, and was priced at US$3500. At | | | | Similar to the HP desktop computers, it had a number |
| introduction, it could have up to 8 KB of RAM (two 4 | | | | of F-keys (F1 through F8) placed close to the screen. |
| KB semiconductor RAM cards). Also introduced in | | | | Paper templates were available for some application |
| 1975 was the HP 2644A, which was an HP 2640A | | | | programs to which placed legends for these keys on |
| with mass storage (two mini-tape cartridges), for | | | | the keyboard. Later models arranged these across the |
| US$5000. | | | | top row, and provided for screen labels close to their |
| Model Number | | | | respective keys. Terminal configuration in the 262X |
| The HP catalogs usually refer to the terminal model as | | | | series was done entirely through the screen labeled |
| simply "2640A", and infrequently as "HP 2640", or "HP | | | | function keys rather than dedicated keys and through |
| 2640A" (both with a blank after the "HP"), or "2640". | | | | escape sequences sent from the host computer. The |
| The incorrect "HP2640" and "HP2640A" are often | | | | on-screen labeling of the eight function keys, pioneered |
| seen outside of HP. | | | | by the HP 300 ("Amigo") computer, was one of the |
| Functionality | | | | first applications of a hierarchical menu which allows |
| The functionality defined by the HP 264X series hasn't | | | | accessing many functions with a small number of |
| changed much as the preferred terminal for HP1000 | | | | keys. This arrangement is now common on TI graphic |
| and HP3000 series computers. They never achieved | | | | calculators, and automated teller and gas pump |
| the notoriety of the VT100 among programmers, but | | | | machines, though no longer used in GUI user interfaces. |
| included sophisticated features not found in the VT100, | | | | Internally, the electronics used a motherboard with |
| such as offline forms, multipages, and (in some models) | | | | plug-in daughter cards. The microprocessor, memory, |
| local storage. | | | | serial interface card, and various optional functions |
| The styling looked like vaguely like a toaster oven. It | | | | were each on separate cards. This permitted easy |
| was boxy, with a "widescreen" aspect ratio. HP had | | | | field maintenance, upgrades, and reconfiguration. For |
| determined that the combination of a standard 4:3 | | | | example, more memory (providing larger scrollback |
| aspect ratio with the 25 line by 80 character display | | | | capability) could be easily added, the serial interface |
| that was the standard of the time required the | | | | could be changed from RS-232 to current loop, etc. |
| characters to have a very high profile. HP's response | | | | The optional tape drives of the 2645 model were |
| was to specify a CRT with an aspect ratio designed | | | | interfaced via another plug-in card. The plug-in card |
| around the desired character shape instead of the | | | | capability strongly resembled the later Apple-II |
| other way around. Of course, this also mandated | | | | expansion architecture. |
| rather high manufacturing costs as standard parts | | | | The manufacturing area was across from R&D |
| could not be used. | | | | cubicles in the Data Terminals Division in Cupertino. The |
| HP took pains to further improve the rendering of | | | | testing area was dubbed "beepland" because it had |
| displayed characters via half-pixel positioning of | | | | racks of 500 terminals, with the end of the test ending |
| individual lines within each character. Although the | | | | in a beep. |
| character cell was only 7 horizontal by 9 vertical dots, | | | | |