glossary:glossary_h
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revisionNext revisionBoth sides next revision | ||
glossary:glossary_h [2018/09/28 09:02] – [Handset] Bob Vetterlein | glossary:glossary_h [2019/09/05 19:14] – added text for Hexadecimal or Hex entry tgerbic | ||
---|---|---|---|
Line 40: | Line 40: | ||
This is a track detector ([[glossary: | This is a track detector ([[glossary: | ||
Merg kit (for members only) | Merg kit (for members only) | ||
+ | |||
+ | |||
+ | ===== Hexadecimal or Hex ===== | ||
+ | |||
+ | |||
+ | Computer data is a collection of binary bits, ones and zeros. Programmers generally collect bits into convenient sets of four bits (a nibble) or eight bits (a byte). | ||
+ | |||
+ | When it comes to writing and speaking the values of bits, rather than saying the value is 10010011, it is simpler to break the bits into small chunks and use a different number system. In the past collecting sets of three bits was common (Octal or base 8) but today sets of four bits are generally used (Hexadecimal or base 16). | ||
+ | |||
+ | Binary uses two characters to count before moving/ | ||
+ | |||
+ | You can say the address of a byte of data in memory is at location 0101010010101001 in binary or at 21,673 in decimal. Alternately the binary number is broken into sets of four bits (0101 0100 1010 1001) and each set is converted to a hex number (5 4 A 9). So it can be said that the byte of data is at memory location 54A9. The four digit 54A9 is easier to remember, shorter to say and less error prone to write. | ||
+ | |||
+ | When a hex number is used in a program or written text, it is usually proceeded by some characters to identify which number system you are using. | ||
Line 48: | Line 62: | ||
- | ===== HYPOTRAC | + | ===== H0 ===== |
+ | Scale and gauge common in America, Asia and Europe but excluding UK. Scale 1:87, gauge 16.5 mm. | ||
+ | |||
+ | ===== HYPOTRAC ===== | ||
This a high voltage track detector system for 2 rail Model railway track , see TB T9/2 merg members only | This a high voltage track detector system for 2 rail Model railway track , see TB T9/2 merg members only | ||
Line 57: | Line 74: | ||
- | Hysteresis is wellknown | + | Hysteresis is well known in ferromagnetic materials. When an external magnetic field is applied to a ferromagnet, |
[[wp> | [[wp> | ||
glossary/glossary_h.txt · Last modified: 2021/08/08 04:50 by Wayne