HIEE300698R0001模块卡件，ABB使用产品
ISA超级输入/输出设备（ISASIO）MVME2700使用了美国国家航空公司的PC87308 ISASIO芯片半导体来实现P2和前面板的某些部分输入/输出：❏ 两个异步串行端口（COM1和COM2）通过P2和过渡模块
❏ 通过P2和转换模块的并行端口：–MVME712M兼容机型中的Centronics打印机端口
–兼容MVME761的IEEE1284双向并行端模型❏ 通过驱动器/电源连接器J3支持软盘驱动器❏ 通过圆形DIN连接器J5和J7异步串行端口
HIEE300698R0001模块卡件ISASIO设备提供的两个异步端口采用通过EIA-232-D驱动器和接收器缓冲的TTL电平信号并连接到P2连接器。硬件使用ISA将两个串行端口初始化为COM1和COM2输入/输出基址分别为3F8美元和2F8美元。此默认值配置还将COM1分配给PIB（PCI/ISA网桥控制器）中断请求行IRQ4和COM2到行IRQ3。更改默认值配置，重新编程ISASIO设备。用于详细编程信息，请参阅
MVME2600/2700系列程序员参考指南和ISASIO设备的供应商文档。并行端口并行端口是MVME712M兼容机型中的Centronics打印机接口，以及中的完整IEEE1284双向并行端口MVME761兼容型号。这两个版本都使用ISASIO设备。所有并行输入/输出接口信号通过串联阻尼电阻器。硬件使用ISA IO基址将并行端口初始化为PPT130亿美元。此默认配置还将并行端口分配给PIB（PCI/ISA网桥控制器）中断请求线IRQ7。你可以改变通过重新编程ISASIO设备的默认配置。对于详细编程信息，请参阅PCI和ISA总线《MVME2600/2700系列程序员参考》中的讨论ISASIO设备的指南和供应商文档。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.
