Q47031: .Startup Not Interchangeable with ORG Instruction, Tiny Model

Article: Q47031
Product(s): See article
Version(s): 2.01
Operating System(s): MS-DOS
Keyword(s): ENDUSER | docerr | mspl13_masm
Last Modified: 26-JUL-1989

Page 80 of the "QuickAssembler Programmer's Guide" implies that the
.Startup directive in a tiny model program can be readily replaced
with an ORG 100h instruction. This is not true. The .Startup directive
does more than just generate an ORG 100h in the tiny memory model. If
you try to replace .Startup with ORG 100h, you get the following error
during the link phase:

   LINK : fatal error L2051: start address not equal to 0x100 for /TINY

In all memory models, the .Startup directive generates necessary
start-up code for the given memory model and stack type. It also
initializes DS, SS, and SP, as necessary.

Be sure to use .Exit as well as .Startup to avoid other errors.

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