- 您現在的位置：買賣IC網 > PDF目錄363665 > NSB8 (Electronic Theatre Controls, Inc.) BASIC interpreter for Z80 family PDF資料下載
參數資料
| 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： | 136/158頁 |
| 文件大?。?/td> | 752K |
| 代理商： | NSB8 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁當前第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁
grifo
ITALIAN TECHNOLOGY
Page 124
NSB8 Rel. 5.10
FILE BUFFER SIZES, LIFETIMES OF BUFFERS
When each file is opened, an area of RAM memory is reserved as a high speed data transfer buffer
between BASIC and the disk drive. A buffer of 128 bytes is reserved when opening a file. Buffers
are used to make disk access as efficient and quick as possible. When the file is closed, its buffer
region does not return to free memory, but is reserved for later use by any files which will be opened
under the file number associated with the buffer.
PRINT HEAD TABLE
At memory addresses ORG+17 and ORG+18 (ORG+11H and ORG+12H) there exists a pointer
containing the low and high bytes, respectively, of the address in memory where BASIC’s print head
table is stored. Each of the 8 bytes in this table contains the current cursor position for one of BASIC’s
8 possible I/O devices (starting with device #0). For some applications, such as plotting, some users
may wish to EXAM or FILL these bytes to avoid LENGTH ERROR messages or the automatic
carriage return which BASIC supplies when enough characters to fill a line have been printed on a
given device. Users with standard versions of BASIC may use the following user function to return
the address of the table entry for any of the 8 devices. EXAM or FILL this address to determine or
change the value of the print head counter for the given device.
DEF FNH (D) = EXAM (11537) + (EXAM (11538) *256)+D
REM D IS DEVICE NUMBER FROM 0 TO 7
FILE HEADER TABLE
This table follows immediately the 8 bytes of the print head table described above. The file header
table is 80 bytes long, and contains one 10 bytes entry for each of the 8 possible open files (0 to
7). Each entry has the following format:
a
) byte 0:
b
) bytes1
÷
2:
c
) bytes 3
÷
4:
d
) bytes 5
÷
6:
e
) bytes 7
÷
9:
status byte
buffer address for the file (low/high)
disk address of the open file (the number of the file’s beginning disk block)
filesize in blocks
current file pointer: this points to the next byte to be accessed, expressed as an
offset from the start of the file. Because three bytes (arranged as middle byte, high
byte, low byte) are used to represent the pointer value, BASIC may access files as
large as an entire diskette.
BASIC PROGRAM PRE PROCESSING
Once program lines are typed into BASIC, they are pre processed automatically into a more compact,
efficient form where each reserved word maps onto a single byte value (named token) and line
number references in GOTO, GOSUB, RESTORE and similar statements are collapsed into 16 bit
values. This permits faster execution, and more efficient use of storage space in both RAM (when
the program is running or under development) and disk (when the program is saved). When the
program is listed, the comaction process is reversed, and the complete text of the program is restored
相關PDF資料 |
PDF描述 |
|---|---|
| NSB9435T1 | High Current Bias Resistor Transistors(高強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) |
| NSBC143TPDXV6T1 | Dual Bias Resistor Transistors(雙偏置電阻晶體管) |
| NSBC144EPDXV6T1 | Dual Bias Resistor Transistors(雙偏置電阻晶體管) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 產品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復時間: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 產品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復時間: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 50 Volt 8.0 Amp 125 Amp IFSM RoHS:否 制造商:STMicroelectronics 產品: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 產品:Standard Recovery Rectifiers 配置: 反向電壓:100 V 正向電壓下降: 恢復時間: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 安裝風格:SMD/SMT 封裝 / 箱體:DO-221AC 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復。