I successfully built COMMAND.COM (small model) & used 'upx' to compress (per 
Tom Erlert's help). Once installed, it starts up but after a few keyboard 
commands it hangs up -- my diagnostic (printf()) indicates the hang-up is in 
"malloc" -- calls but never returns. Prior to entering the main "input" loop, I 
called malloc()/free() a dozen times with no issue -- smells like a memory 
corruption issue but it's been elusive thus far tracking it down. Has anyone 
else experienced this?
I'm using the "kernel.sys" supplied on the Free-Dos site for 1.2.
thx, Rich..

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