The two asynchronous ports provided by the ISASIO device employ TTL-level 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 IRQ3. 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 MVME2603/2604 Programmer’s Reference Guide, listed in Appendix D, Related Documentation, 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 MVME2603/2604 Programmer’s Reference Guide, listed in Appendix D, Related Documentation, and to the vendor documentation for the ISASIO device.
Disk Drive Controller
The ISASIO device incorporates a PS/2-compatible low- and high-density disk drive controller for use with an optional external disk drive. The drive interfaces with the ISASIO controller via base board connector J4, which relays both power and control signals. The ISASIO disk drive controller is compatible with the DP8473, 765A, and N82077 devices commonly used to implement floppy disk controllers. Software written for those devices may be used without change to operate the ISASIO controller. The ISASIO device may be used to support any of the following devices:
❏ 31 /2-inch 1.44MB floppy disk drive
❏ 51 /4-inch 1.2MB floppy disk drive
❏ Standard 250kbps to 2Mbps tape drive system
Application industry
Our main products are widely used in metallurgy, oil and gas, glass manufacturing, aluminum, petrochemical, coal mine, paper making and printing, textile printing and dyeing, machinery, electronic manufacturing, automobile manufacturing, tobacco, plastic machinery, electricity, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution, etc.
Superior products
We mainly make spare parts for DCS, PLC, robot control system and large servo system.
Main products: various modules/cards, controllers, touch screens, servo drives.
Advantages: professional off production accessories,
Fast delivery, accurate delivery time,
Main brands include ABB, GE/FANC, FOXBORO, TRICONEX, BENTLY NEVADA, A-B, EMERSON, OVATION, MOTOROLA, XYVOM, HONEYWELL, REXROTH, KUKA, NI, DEIF, Reliance Electric, Yokogawa, WOODWARD, SCHNEIDER, MOOG, PROSOFT and other brands