🚀 go-pugleaf

Has anyone used the "_Turbo C Memory-Resident Utilities, Screen I/O, 
and Programming Techniques_" by Al Stevens to create a memory resident 
program?

I inherited a memory resident program that I must maintain.  The 
program is based on the examples in the book.  I have compiled and run 
the program successfully on '286 and '386 machines, but I cannot get 
the program to run on 8088 machines.  When I press the program's "hot 
key", the PC "locks up".  Sometimes a warm boot will revive the 
machine, other times a cold boot is required.

I have looked everywhere that I know of to make sure that the 
compiler/linker are not generating machine specific instructions.  As 
far as I can tell, the program is being loaded into memory properly.  

One thing that I cannot do the way the book suggests, is assembling 
c0.asm.  The book uses the commands:

         C>masm c0,c0t /ML /D__TINY__;
         C>masm c0,c0s /ML /D__SMALL__;

When I run masm for the small module, the following is displayed:

Microsoft (R) Macro Assembler  Version 4.00
Copyright (C) Microsoft Corp 1981, 1983, 1984, 1985.  All rights 
reserved.

c0.ASM(312) : error 9: Symbol not defined CheckSum
c0.ASM(314) : error 9: Symbol not defined lgth_NullCheck
c0.ASM(315) : error 9: Symbol not defined NullCheck

  43724 Bytes symbol space free

      0 Warning Errors
      3 Severe  Errors

The Turbo C supplied commands to rebuild c0t and c0s tell you to use 
the /MX option, not the /ML option.  If /MX is used, there are no 
error messages displayed.  In either case, the memory resident program 
does not work properly.

Any suggestions would be greatly appreciated.

-- 
Mark Regester Information Systems & Services, NCR E&M Wichita
 NCR:654-8340 <M.Regester@Wichita.NCR.COM>
(316)636-8340 <{ece-csc,hubcap,gould,rtech}!ncrcae!ncrwic!m.regester>
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