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- HAYES MICROCOMPUTER PRODUCTS, INC. FOR IMMEDIATE RELEASE
- P.O. BOX 105203
- Atlanta, Georgia 30348
- 404/449-8791
- Peggy Ballard/Sharon O'Brien
-
-
- HAYES ANNOUNCES ENHANCED SERIAL INTERFACE AND
- ENHANCED SERIAL PORT FOR COMMUNICATIONS MANAGEMENT
-
-
- ATLANTA, GA., October 30, 1989 - Hayes Microcomputer Products,
- Inc. today announced a public domain specification for an Enhanced
- Serial Interface (ESI). Also announced were Enhanced Serial Port (ESP)
- hardware products for the IBM Microchannel and IBM XT/AT or EISA bus
- computers. The ESI specification and supporting ESP hardware provide a
- cost-effective communication co-processor to manage the flow of data
- between an external high speed modem and personal computer system.
- This technology prevents loss of data resulting from buffer overflow
- errors and provides maximum data throughput for high speed modems.
-
- Use of software that supports extended memory or RAM disk,
- background communication programs, Terminate and Stay Resident (TSR)
- software, and local area network connections places increased workload
- and time constraints on personal computer systems. Software that
- supports extended memory under DOS and multitasking systems, including
- Microsoft Windows, OS/2, and UNIX, shares system resources, affecting
- the system's ability to handle real time interrupts generated by high
- speed serial communications. These programs and system software
- packages are being rapidly adopted by advanced business users.
-
- During the development of Hayes V-series ULTRA Smartmodem 9600
- (ULTRA 96), the company recognized that system software trends and
- actual modem throughput of 38.4 Kbps require a system solution to
- ensure that buffer overflow errors do not cause characters to be lost
- and that high speed modem performance is maximized.
-
- The Enhanced Serial Interface (ESI) specification is an
- extension of the familiar COM card used in personal computers. ESI
- includes the definition of I/O, control registers, buffer control,
- Direct Memory Access (DMA) to the system, and interaction with attached
- modem devices. The ESI document describes the hardware level interface
- and is useful for software or hardware developers who wish to implement
- these functions.
-
- Hayes ESP for Microchannel and Hayes ESP for the XT/AT or EISA
- bus computers are two hardware products which provide a cost-effective
- communication co-processor function for the PC system. Both products
- support dual serial ports, each operating at speeds ranging from 300
- bps to 38.4 Kbps. This co-processor manages a bi-directional 1K byte
- FIFO buffer for each channel. In addition, the co-processor implements
- automatic flow control between the system and the external modem as
- well as providing DMA transfer to the system's memory for optimum
- performance and reduced software overhead for data communication
- sessions.
-
- "No one wants to find out they are using high speed
- error-control modems and losing characters between the modem and the
- PC," said Hayes President Dennis C. Hayes. "We have provided this
- solution at a time when only the most advanced system users are
- beginning to recognize the need," he added.
-
- "Microsoft commends Hayes for making the Enhanced Serial
- Interface available to the industry as a public domain specification,"
- said Steve Ballmer, Senior Vice President, Systems Division, Microsoft
- Corporation. "It improves communication performance and allows high
- bandwidth data transmission from OS/2 applications," he added.
-
- The ESI specification is available from Hayes Customer Service
- at no charge, and interested developers are encouraged to register with
- Hayes. In addition, limited quantities of Hayes ESP hardware will be
- available in first quarter 1990 for developers to test their software
- supporting ESI.
-
- Hayes ESP for Microchannel will have an estimated retail price
- of $349 in the U.S. and CN$499 in Canada. Hayes ESP for IBM XT/AT and
- EISA will have an estimated retail price of $299 in the U.S. and CN$399
- in Canada. Both products will ship to Hayes North American, Asian, and
- European distribution networks in second quarter 1990. For more
- information about Hayes ESP and the Enhanced Serial Interface, contact
- Hayes Customer Service at 404/441-1617 (United States); 416/283-2627
- (Canada); (852) 5-845-9818 (Hong Kong); or 01-848-1868 (United
- Kingdom).
-
- Best known as the leader in the microcomputer modem market,
- Hayes develops, supplies and supports computer communications equipment
- and software for personal computer and computer communications
- networks. The company distributes its products through an
- international network of authorized dealers, resellers, system
- integrators and original equipment manufacturers.
-
- # # #
-
-
- Feature Overview
-
- Hayes Enhanced Serial Port (ESP)
-
- HAYES ESP
-
- The Enhanced Serial Interface specification and supporting Enhanced
- Serial Port hardware provide a cost-effective communication
- co-processsor to manage the flow of data between an external high speed
- modem and personal computer system. This technology prevents loss of
- data resulting from buffer overflow errors and provides maximum data
- throughput for high speed modems.
-
- Operating Modes
-
- Normal Mode
-
- - Emulation of 16450 UART for transparent operating with
- existing DOS software applications - supports data rates to 115
- Kbps
-
- - Transparent operations with OS/2 communications software
- using standard OS/2 device drivers
-
- - Selectable receive hardware flow control and 16 byte
- character buffer for 16550 UART emulation buffer
-
- Enhanced Mode
-
- - Hayes ESP is managed by a communications co-processor
-
- - Dual transmit and receive 1K buffers and flow control ensure
- bi-directional data integrity to 38.4 Kbps
-
- - Direct Memory Access (DMA) data transfers between the PC
- system and Hayes ESP maximize throughput to 38.4 Kbps by
- lowering the overhead of processor received data interrupts
-
- Port Control and Operations
-
- Normal Mode Character Buffering and Flow Control
-
- - 16 character receive FIFO buffer
-
- - RTS hardware flow control
-
- - DTR hardware flow control
-
- Enhanced Mode Character Buffering and Flow Control
-
- - 1K bi-directional FIFO buffer to service DMA block transfers
-
- - RTS/CTS hardware flow control
-
- - DTR/DSR hardware flow control
-
- - XON/XOFF software flow control
-
- - Transparent XON/XOFF software flow control
-
- Dual Port Operation
-
- - Hayes ESP provides two serial ports which can simultaneously
- manage and transfer data to 38.4 Kbps
-
- Bus Interface
-
- - Hayes ESP for the MCA bus
-
- - Hayes ESP for XT/AT or EISA bus
-
- Operating System Interface
-
- Normal Mode
-
- - Existing DOS applications
-
- - OS/2 communications software using standard OS/2 device
- drivers
-
- Enhanced Mode
-
- - In order to utilize the 1K byte FIFO buffer, flow control,
- and DMA features of Hayes ESP co-processor, software support of
- the Enhanced Serial Interface (ESI) is required
-
- - For MS DOS a device driver supporting ESI must be included as
- part of the controlling application
-
- - For multi-tasking environments such as Microsoft Windows,
- OS/2, and UNIX, a separate standalone driver is required to
- support applications written for these environments
-
-
- # # #