 MATHCAD VERSION 1.1 ON-LINE RELEASE NOTES 

         This file contains the most up-to-date product            
         information on this release of MathCAD, including         
         additions and corrections to the material in the MathCAD  
         User's Guide and New Features Booklet.                    

 HOW TO CONTACT MATHSOFT INC. 

         If you require any assistance, please call MathSoft at            
         1-800-MATHCAD or (617) 577-1017. We would be pleased to help you  
         during regular business hours (Eastern Time), Monday through      
         Friday.                                                           
                                                                           
         We strongly encourage you to mail in your registration card.      
         Registered users receive the MathCAD User's Journal and the       
         MathCAD Applications and Games Disk. Registered users will also   
         receive information on future upgrades to MathCAD.                
                                                                           
         We continue to work on problems that users bring to our           
         attention. By keeping in touch with us, you can be sure that you  
         will be made aware of any maintenance upgrades that remedy those  
         problems.                                                         

 SEND US YOUR SUGGESTIONS 

         Help us plan for new features in future versions of MathCAD. We 
         appreciate your suggestions for new features, or for changes in 
         existing features.                                              

 MATHCAD AS A TWO-DISK SYSTEM 

         MathCAD is now on two disks -- a Program Disk, labeled "Version   
         1.1," and an Auxiliary Disk. The Program Disk contains the        
         MathCAD program itself. The Auxiliary Disk contains the Help file 
         and sample MathCAD documents. See the New Features Booklet,       
         Version 1.1, for instructions on loading MathCAD from these two   
         disks.                                                            

 TUTORIALS ON EDITING EQUATIONS 

         To learn more about editing equations, load the document EDITING.MCD 
         included on the MathCAD Auxiliary Disk. This document is a           
         "tutorial" with information and instructions that help clarify how   
         to create and edit MathCAD equations. The instructions continue in   
         EDITING2.MCD and EDITING3.MCD.                                       

 SAMPLE MATHCAD DOCUMENTS 

         The MathCAD Auxiliary Disk includes many sample documents. All the   
         sample document files end in the extension ".MCD" . Load them to see 
         examples of MathCAD in action. To save time, you may want to load    
         these documents in manual mode by typing "MCAD /M filename" at the   
         DOS prompt.                                                          

 UNITS DOCUMENTS 

         The MathCAD Auxiliary Disk includes three files that contain unit  
         conversions.                                                       
                                                                            
         CGS.MCD contains unit conversions in the cgs system, based on      
         centimeters, grams, and seconds. All units, including electrical   
         units, are defined in terms of these base units.                   
                                                                            
         MKS.MCD contains unit conversions in the MKS system, based on      
         meters, kilograms, seconds, and coulombs.                          
                                                                            
         USCUSTOM.MCD contains unit conversions based on the U.S. Customary 
         units of feet, pounds (mass), seconds, and coulombs.               

         You can add these conversions into files you create, or append 
         them to the end of your files using the MathCAD append         
         command.                                                       

 PROGRAM NOTES 
 ============= 

 COPROCESSOR PROBLEMS IN NEARLY COMPATIBLE MACHINES 

         Computers produced by certain manufacturers, use a non-standard      
         configuration for the 8087 and 80287 coprocessors. As a result, if   
         you have an 8087 or 80287 coprocessor in such a machine, you may     
         experience serious difficulties in using MathCAD.                    
                                                                              
         These difficulties can interrupt the program in ways that            
         necessitate restarting your computer, especially in conditions of    
         underflow, overflow, or other arithmetic errors. The problems with   
         these computers result from a lack of 100% compatibility with the    
         IBM PC.                                                              
                                                                              
         To avoid difficulties with nearly compatible computers, use the      
         following DOS command before starting MathCAD:                       
                                                                              
                 SET no87=no87                                                
                                                                              
         Once you execute this command, MathCAD will ignore the coprocessor   
         chip. The program will run more slowly, but there should be no       
         problems that require rebooting                                      
                                                                              
         For more information, contact MathSoft at (617) 577-1017.            

 REDISPLAY COMMAND 

         If you suspect that the MathCAD display screen is not accurately 
         reflecting the state of a document, or if equations on screen    
         have gaps or overlap one another, use the redisplay command by   
         pressing [Ctrl]R. This redisplays the whole screen.              
                                                                          
         Here are some actions that can cause the display to have gaps or 
         unreadable parts:                                                
                                                                          
             1. Regions that overlap one another on the screen.           
                                                                          
             2. Error messages from an equation or plot that coincide     
                on screen with other regions.                             
                                                                          
             3. Cutting and pasting equations that overlap one another.   
                                                                          
             4. Pressing [Ctrl][Break].                                   
                                                                          
         None of these problems can cause computational errors; they      
         affect the display only. When the information on the screen is   
         unclear, press [Ctrl]R to redisplay everything.                  

 DISK AND PRINTER ERRORS (ABORT/RETRY/IGNORE) 

         If you attempt an action that causes a disk or printer error, 
         you will see an error message generated by DOS, for example:  

                Not ready error reading drive A 
                Abort, Retry, Ignore?           

         (Because of incompatibilites between the Hercules Card's        
         graphics mode and DOS, these errors messages appear as          
         unreadable patterns of dots on the Hercules Card. However, you  
         can still respond to them as described below.)                  

         When you see such a message, correct the problem, type "R"  
         for retry, and press [Enter].                               
                                                                     
         If you type "A" for abort, you will abort MathCAD and       
         immediately return to DOS, if you have not saved your       
         document, this can result in a loss of data.                

 SPECIAL NOTE FOR HERCULES GRAPHICS CARD USERS 

         The INT10.COM program is necessary to run MathCAD on a Hercules 
         Graphics Card (see User's Guide, page 160). However, this       
         program uses up about 4K of memory each time you use it.        
                                                                         
         If you use MathCAD several times in succession, there is no     
         reason to use INT10 each time you run MathCAD. Use INT10 once,  
         at the start of your computing session, before the first time   
         you run MathCAD. Alternatively, put the command INT10 in your   
         AUTOEXEC.BAT file.                                              

 SPEEDING THE ENTRY OF EQUATIONS -- MANUAL CALCULATION MODE 

         If you enter long or complicated documents that require a lot of 
         calculation, you may not want to wait for MathCAD to recalculate 
         after you enter each equation. You can put MathCAD in MANUAL     
         CALCULATION MODE as follows:                                     
                                                                          
                 1. From within MathCAD, type "[Esc] manual [Enter]" .    
                                                                          
            or   2. When you start MathCAD, use the /M option, for        
                    example "MCAD /M filename" .                          
                                                                          
         With MathCAD in manual calculation mode, the document is not     
         recalculated until you press [F9] or use the process command     
         ([Esc] process [Enter]).                                         

 REPROCESSING A DOCUMENT 

         Use the process command -- [Esc] process [Enter] -- to make sure  
         that all the calculated values in your document are up-to-date.   

 PROCESSING INDIVIDUAL EQUATIONS 

         To process an equation, put the cursor in it and press the calc key, 
         [F9]. This recalculates the equation. If the equation includes the   
         "rnd" function, this generates new random numbers; if the equation   
         includes a file-access function, this rereads or rewrites the        
         associated data file; if you interrupted calculation of the equation 
         by pressing [Ctrl]A, this resumes the calculation.                   

 PRINTING DOCUMENTS 

         Ordinarily, you can print documents using the MathCAD print command. 
         See the printed piece "Version 1.0 Release Notes" for more           
         information on printers that MathCAD supports.                       
                                                                              
         If you have difficulty printing a document, or your printout seems   
         to have gaps or other defects, MathCAD may be having a               
         communications problem with your printer. To avoid the problem, try  
         following these steps:                                               
                                                                              
             1. Print the document to a file. Type [Esc] print [Enter] and    
                specify a printer type. In response to the prompt for print   
                area, just press [Enter]. Then, in place of the printer       
                device, specify a filename like OUTPUT.PRN.                   
                                                                              
              2. Save your document and exit MathCAD by pressing [F2].        
                                                                              
              3. At the DOS prompt, type:                                     
                                                                              
                        COPY /B OUTPUT.PRN PRN                                
                                                                              
                 This sends the print file to the printer. Substitute the     
                 filename you used in step 1 for OUTPUT.PRN and the name of   
                 the port to which your printer is attached (for example,     
                 LPT1 or COM1) for PRN.                                       

 COMPLEX CONTOUR INTEGRALS 

           MathCAD can do complex contour integrals as well as real        
           integrals. See the file CONTOUR.MCD on the Auxiliary Disk for   
           an example.                                                     
