*********************************************************************
DRV.TXT -   SeaMAC SDLC / HDLC Synchronous Serial Port Driver Notes

ACB Developers Toolkit 1995

*********************************************************************
This document is organized with the following conventions:

Section 1.  Upgrade Notice and General Information
Section 2.  Diskette Layout
Section 3.  Programming Information
Section 4.  Hardware Setup
Section 5.  Available Diagnostics
Section 6.  Documentation Updates
Section 7.  Known Problems, Bugs, and Conflicts

*********************************************************************

Section 1. Upgrade Notice and General Information

SeaMAC is a serial communications software driver that provides fully 
buffered input and output to synchronous serial communication ports. 
SeaMAC supports the Advanced Communication Board (ACB) family of synchronous 
communication cards. The ACB family of communication cards offers a 
synchronous communication port in all popular electrical interfaces 
including RS-232, RS-422, RS-485, V.35, and MIL-188. This driver provides 
the programmer with a robust and reliable means for servicing synchronous 
serial ports while maintaining a straightforward and consistent software 
interface.

SeaMAC was designed to operate on an IBM compatible computer. This driver 
utilizes interrupts and Direct Memory Access (DMA) to obtain the highest 
level of performance. Presently, this driver supports only one port of the 
ACB card. This driver was designed to communicate with protocols that use 
HDLC / SDLC type bit oriented framing. 

The SeaMAC manual is available from the Sealevel Systems Incorporated 
Developer's Assistance Program.  Contact customer service at the numbers 
listed in the README.TXT file in the root directory of this diskette to 
become a member of this program. This version of the DOS SDLC / HDLC 
Synchronous Serial Port Driver is fully functional. 

SeaMAC currently supports the following specifications:

 * Supports XT (2-7) and AT (8-15) Interrupt Requests (IRQs).
 * Bi-directional buffered I/O on a single port of the 8530 or 85230.
 * Written in optimized assembly language for maximum performance.
 * Ideal for SDLC / HDLC / LAP / LAPD applications or any other protocols 
	that use HDLC / SDLC type framing.
 * Direct Memory Access transfers allow data rates greater that 1Mbps
 * Supports the Advance Communication Board (ACB) family of synchronous 
	communication products.
 * Flexible clocking options including DTE, DCE, and encoded clocking
 * Independently configurable input and output frame buffers.
 * Z85230 ESCC high speed upgrade supported
 * RS-485 mode supported when using the Z85230 ESCC
 * High level language library supports assembly, C, and C++.

*********************************************************************

Section 2. Distribution Diskette Layout

The following is a summary of the files and directories that are in the
DRV sub-directory on this diskette.

DRV\                   - Main Directory contains main executables
DRV\SEAMAC.EXE         - Terminate and Stay Resident (TSR) Driver
DRV\SEAMAC.INI         - Example Driver Configuration File
DRV\DRV.TXT            - The file you are viewing
DRV\ACB.TXT            - Text file containing hardware setup information    
DRV\SAMPLES\           - Sub directory containing sample programs demonstrating
		      the use of the Serial Port Driver
DRV\LIBRARY\           - Contains all object and library files for static linking
		      with various high level languages.
*********************************************************************

Section 3. Programming Information

The LIBRARY sub-directory contains all object and library files that should be
linked to your application. Although these library files are not required to
use the Driver, however they do provide a high level interface to access the
Drivers services. All accesses to the driver are done via a software
interrupt. 

C and C++ Note: When using the Driver with the C++ language the header file
    will declare all calls extern "C". This will allow you to link the .obj
    files to you application.

Assembly Note: The C and C++ object files that are provided on the
    distribution diskette can be used in an assembly language program.
    The calling program must use the C calling convention. If you are
    using MASM 6.0 or greater you can use the INVOKE directive. 

*********************************************************************

Section 4. Hardware Setup

Please refer to the ACB.TXT file in this directory for information
regarding hardware setup.

*********************************************************************

Section 5. Available Diagnostics

Please refer to the README.TXT file in the root directory for information
regarding serial port diagnostics.

*********************************************************************

Section 6. Documentation Updates

Presently there are no documentation updates.

*********************************************************************

Section 7. Known Problems or Conflicts

Presently there are no known problems or conflicts with the Serial Driver.

*********************************************************************