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參數(shù)資料
| 型號： | NSB8 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | BASIC interpreter for Z80 family |
| 中文描述： | Z80的BASIC解釋為家庭 |
| 文件頁數(shù)： | 83/158頁 |
| 文件大?。?/td> | 752K |
| 代理商： | NSB8 |
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ITALIAN TECHNOLOGY
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Page 71
NSB8 Rel. 5.10
PRECISION
Numbers in the standard version of
NSB8
are stored with 8 digits precision. Other precisions are
available, see section NON STANDARD VERSION OF BASIC for details.
NSB8
uses the most
accurate form of microcomputer arithmetic available: binary coded decimal (BCD), see section
COMPATIBILITY WITH OTHER BASICS. All arithmetic operations are rounded to 8 digits in the
standard version of
NSB8
, e.g., the sum of .12345678 and .011111111 would be rounded to
.13456789, since .134567891 requires 9 digits.
FRACTIONS
What is the decimal representation of 2/3 An endless string of 6’s after the decimal point is the only
correct answer. However, when doing decimal arithmetic, both people and computers round off the
long fraction to a reasonably accurate (but not completely accurate) number. BASIC, for example,
will round 2/3 to .66666667. notice that the local number of digits is now 8. It is impossible to get
a more accurate representation of 2/3 in non standard
NSB8
. The fraction 1/2, on the other hand,
needs only a single digit (.5) to represent it exactly!
MIXED DECIMAL FRACTIONS WITH LARGE WHOLE PARTS
Eight digit precision also means that the number 1234.56789 must be rounded before it can be
handled by the machine.
NSB8
will round this to 1234.5679. Notice that the least important,
rightmost digit is rounded. This is BASIC’s standard rounding procedure, and insures that the
rounded number remains as close to the original value as possible.
Business users should note that the largest dollars and cents figure which may be exactly represented
by 8 digits (without rounding cents to dimes or dollars) is $999,999.99. For applications where
dollars and cents amounts larger than this must be handled, you should obtain a special version of
BASIC (with greater precision).
VERY LARGE NUMBER
The number 987654321 will be rounded to 987654320, and, henceforth will normally be printed in
scientific notation by BASIC as 9.8765432E+08. As you can see, the eight digit rule is followed in
this conversion, even though scientific notation is invoked in order to correctly represent the
number. The last (9
th
) digit is dropped, but scientific notation representation insures that a 0 will be
remembered for the ninth digit in order to maintain proper place values for the remaining
digits. Notice that, because of this effect, BASIC considers 987654320, 987654321, and 987654322
to be equal to one another because they differ only in their (ignored) ninth digits.
VERY SMALL NUMBER
The number .00000000123 will not be rounded by
NSB8
, but .00000000123456789 will be
rounded. To see why, think of the two numbers as expressed in scientific notation. The first becomes
1.23E-09. The mantissa (which is the only component of an E format number that is affected by
precision) is only 3 digits long, well within the 8 allowed. The second number converts to
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NSB8AT | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Glass Passivated General Purpose Plastic Rectifier |
| NSB8AT/31 | 功能描述:整流器 50 Volt 8.0 Amp 125 Amp IFSM RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復(fù)時間:1.2 us 正向連續(xù)電流:2 A 最大浪涌電流:35 A 反向電流 IR:5 uA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DO-221AC 封裝:Reel |
| NSB8AT/45 | 功能描述:整流器 50 Volt 8.0 Amp 125 Amp IFSM RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復(fù)時間:1.2 us 正向連續(xù)電流:2 A 最大浪涌電流:35 A 反向電流 IR:5 uA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DO-221AC 封裝:Reel |
| NSB8AT/81 | 功能描述:二極管 - 通用，功率，開關(guān) 50 Volt 8.0 Amp 125 Amp IFSM RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Switching Diodes 峰值反向電壓:600 V 正向連續(xù)電流:200 A 最大浪涌電流:800 A 配置: 恢復(fù)時間:2000 ns 正向電壓下降:1.25 V 最大反向漏泄電流:300 uA 最大功率耗散: 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:ISOTOP 封裝:Tube |
| NSB8AT-E3/31 | 功能描述:整流器 50 Volt 8.0 Amp 125 Amp IFSM RoHS:否 制造商:Vishay Semiconductors 產(chǎn)品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復(fù)時間:1.2 us 正向連續(xù)電流:2 A 最大浪涌電流:35 A 反向電流 IR:5 uA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DO-221AC 封裝:Reel |
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