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It's very possible (easy, in fact) to read a data area and then release
it without writing to it.
Just don't use the S/36 "UDS" method of reading it.
Instead, just code it with DS instead of UDS. Then use the IN op-code
to read it. The IN op-code lets you choose whether to lock it or not.
Even if you choose to lock it, you can release that lock with the UNLOCK
op-code, you don't have to write to it.
The only key is to stop using "UDS" -- that's the legacy way of reading
a data area, from the S/36 (and even earlier). You don't need the "U"
in "UDS" to read a data area!
David FOXWELL wrote:
So it's impossible to read in a data area and then release it without writing to it?
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