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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 135/158頁(yè) |
| 文件大小： | 752K |
| 代理商： | NSB8 |
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ITALIAN TECHNOLOGY
grifo
Page 123
NSB8 Rel. 5.10
IMPLEMENTATION NOTES
This appendix is designed to provide important details concerning some of the internal workings of
NSB8
, and the internal representations of data within BASIC, in order to help you better understand
the operation of the system, and to facilitate writing of programs which performs tasks which would
be difficult or impossible to undertake without such information.
DISKETTE DATA STORAGE FORMATS
All numbers which have been written to diskette by a BASIC of a given precision will have a standard
fixed storage size in bytes. However, the storage size of a number written to disk by 6 digits BASIC,
for example, will be smaller in size than that of a number written by 10 digits BASIC. Here is a chart
which tells how many bytes a number will require on disk, depending upon the precision of the
BASIC writing it:
PRECISION
6
8
10
12
14
BYTES
4
5
6
7
8
Numbers are stored in packed, binary coded decimal (BCD) form. The representation is as followa:
first byte
:
bits 7
÷
4 = most significant digit of value in BCD coding
bits 3
÷
0 = next most significant digit of value
middle bytes
:
bits 7
÷
4 = next significant digit of value in BCD coding
bits 3
÷
0 = next significant digit of value
last byte
:
bit 7 =
bits 6
÷
0 = exponent in excess 64 binary representation (if all bits in the last byte
are 0, the entire number is 0).
sign (1=negative, 0=positive)
All values are normalized.
The decimal value of the first byte in a number stored on disk will always be greater than 15, even
when the number is zero. This is how the TYP function determines if the next data element is
numeric.
Strings are stored using a number of bytes equal to the length of the string plus two or three overhead
bytes. Strings of length less than or equal to 255 are stored with two overhead bytes, the first one
being of decimal value 3, and the second containing the number of characters in the string. The
information bytes (the string itself) follow the overhead bytes. A string value of length greater than
255 is stored with three overhead bytes, the first one being of value 2, and the second two being the
low and high bytes, respectively, of the length of the string, expressed as a 16 bits integer. Again, the
string itself follows the overhead.
The endmark for a sequential file is a single byte of value 1.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NSB9435T1 | High Current Bias Resistor Transistors(高強(qiáng)度電流偏置電阻晶體管) |
| NSBA114EDXV6T1 | Dual Bias Resistor Transistors(雙偏置電阻晶體管) |
| NSBA114YDXV6T1 | Dual Bias Resistor Transistors(雙偏置電阻晶體管) |
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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(chēng):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(shí)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(shí)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(kāi)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(shí)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(shí)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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