In some situations could be even like this, if the table content can be trashed (or is in ROM?) 
ld sp,hl (6+1)
ex (sp),hl (4+1)
ex (sp),hl = 4+1? no way, checks your timming.
that function is 19 + 1
ex (sp),hl 19 (4, 3, 4, 3, 5)
It seems the reference I've been using for years sux 
ex (sp),hl (4+1)
Unfortunately it is 19+1.
thx to all i will try. teoretically i can use eugeny tecnique, because my code run on VBLANK ISR and i can safely disable ints, because the entire code must complete before the next int..
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