HIEE300698R0001模塊卡件，ABB使用產(chǎn)品
ISA超級(jí)輸入/輸出設(shè)備（ISASIO）MVME2700使用了美國(guó)國(guó)家航空公司的PC87308 ISASIO芯片半導(dǎo)體來實(shí)現(xiàn)P2和前面板的某些部分輸入/輸出：? 兩個(gè)異步串行端口（COM1和COM2）通過P2和過渡模塊
? 通過P2和轉(zhuǎn)換模塊的并行端口：–MVME712M兼容機(jī)型中的Centronics打印機(jī)端口
–兼容MVME761的IEEE1284雙向并行端模型? 通過驅(qū)動(dòng)器/電源連接器J3支持軟盤驅(qū)動(dòng)器? 通過圓形DIN連接器J5和J7異步串行端口
HIEE300698R0001模塊卡件ISASIO設(shè)備提供的兩個(gè)異步端口采用通過EIA-232-D驅(qū)動(dòng)器和接收器緩沖的TTL電平信號(hào)并連接到P2連接器。硬件使用ISA將兩個(gè)串行端口初始化為COM1和COM2輸入/輸出基址分別為3F8美元和2F8美元。此默認(rèn)值配置還將COM1分配給PIB（PCI/ISA網(wǎng)橋控制器）中斷請(qǐng)求行IRQ4和COM2到行IRQ3。更改默認(rèn)值配置，重新編程ISASIO設(shè)備。用于詳細(xì)編程信息，請(qǐng)參閱
MVME2600/2700系列程序員參考指南和ISASIO設(shè)備的供應(yīng)商文檔。并行端口并行端口是MVME712M兼容機(jī)型中的Centronics打印機(jī)接口，以及中的完整IEEE1284雙向并行端口MVME761兼容型號(hào)。這兩個(gè)版本都使用ISASIO設(shè)備。所有并行輸入/輸出接口信號(hào)通過串聯(lián)阻尼電阻器。硬件使用ISA IO基址將并行端口初始化為PPT130億美元。此默認(rèn)配置還將并行端口分配給PIB（PCI/ISA網(wǎng)橋控制器）中斷請(qǐng)求線IRQ7。你可以改變通過重新編程ISASIO設(shè)備的默認(rèn)配置。對(duì)于詳細(xì)編程信息，請(qǐng)參閱PCI和ISA總線《MVME2600/2700系列程序員參考》中的討論ISASIO設(shè)備的指南和供應(yīng)商文檔。ISA Super I/O Device (ISASIO)
The MVME2700 uses a PC87308 ISASIO chip from National
Semiconductor to implement certain segments of the P2 and front-panel
I/O:
? Two asynchronous serial ports (COM1 and COM2) via P2 and
transition module
? Parallel port via P2 and transition module:
– Centronics printer port in MVME712M-compatible models
– IEEE1284 bidirectional parallel port in MVME761-compatible
models
? Floppy disk drive support via drive/power connector J3
? Keyboard and mouse interface via circular DIN connectors J5 and
J7
Asynchronous Serial Ports
The two asynchronous ports provided by the ISASIO device employ TTLlevel signals that are buffered through EIA-232-D drivers and receivers
and routed to the P2 connector.
Hardware initializes the two serial ports as COM1 and COM2 with ISA
I/O base addresses of $3F8 and $2F8 respectively. This default
configuration also assigns COM1 to PIB (PCI/ISA Bridge Controller)
interrupt request line IRQ4 and COM2 to line IRQ3. To change the default
configuration, reprogram the ISASIO device. For detailed programming
information, refer to the PCI and ISA bus discussions in the
MVME2600/2700 Series Programmer’s Reference Guide and to the
vendor documentation for the ISASIO device.
Parallel Port
The parallel port is a Centronics printer interface in MVME712Mcompatible models, and a full IEEE1284 bidirectional parallel port in
MVME761-compatible models. Both versions are implemented with the
ISASIO device. All parallel I/O interface signals are routed to P2 through
series damping resistors.Hardware initializes the parallel port as PPT1 with an ISA IO base address
of $3BC. This default configuration also assigns the parallel port to PIB
(PCI/ISA Bridge Controller) interrupt request line IRQ7. You can change
the default configuration by reprogramming the ISASIO device. For
detailed programming information, refer to the PCI and ISA bus
discussions in the MVME2600/2700 Series Programmer’s Reference
Guide and to the vendor documentation for the ISASIO device.
