Having gone through it all again, Ive come to the conclusion that the bugs are in the documentation! This is what it should look like:
||Vector $11A Reserve Room on Arithmetic Stack QA.RESRI
Call parameters                         Return parameters
D1.L Number of bytes required          D1 ???
D2                                     D2.L ???
D3                                     D3.L ???
A0                                     A0 Preserved
A1                                     A1 ???
A2                                     A2 Preserved
A3                                     A3 Preserved
Error returns: none
In other words, in the case of insufficient memory this routine returns to a higher level; it never comes back here. There is no need, in fact it is a mistake, to test d0 on return from this routine.
If anyone knows otherwise then please let ut know!

Per
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