isa20on isA20on 1.6 diagnoses the "packed file corrupt message"
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isa20on Description

isA20on is a method for diagnosing why some programs FAIL with a "packed file corrupt message" isA20on 1.6 diagnoses the "packed file corrupt message". It will tell you if the A20 address line is enabled. When A20 is enabled, the 64K HMA region above 640K is accessible. Unfortunately, because of a bug in EXEPACK, programs that were treated with Exepack, that load into the first 64K of RAM, don't work. MASM/OPTAsm source included. By Roedy Green of Canadian Mind Products. Copyrighted but may be copied freely for non-military use only. Version 1.6 just embeds the new address and phone number. This is only of Interest for ancient DOS machines.

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