A86: Some more confusion

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A86: Some more confusion

This simple bit of code is designed to display the contents of "a" (received from the GET_KEY call) at the top of the screen. Since it's going so fast, you should only see a byte when you're holding down a key. I'm not getting anything. Can someone see the problem?
 
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#include "ti86asm.inc"
#include "asm86.h"
 
.org _asm_exec_ram
 
 ld hl,$FC00
 call _clrLCD
loop:
 call _clrLCD
 call GET_KEY
 cp $37
 ret z
 ld (hl),a
 jp loop
 
.end
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Thanks
 
Mark L.