Sharp mz-3500 Manual For Use page 202

Section A: System interface
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29 - Get Write Protection Vector
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On entry:
c
DE
On return: HL
lDH
Write Protection Vector
Possible logical errors:
- none -
Possible physical errors:
- none -
Differences to CP/M plus:
Physical errors can occur.
Differences to CP/M 2.2 resp. DiCOS:
- none -
A
16-bit vector is returned in
HL
denoting all drives currently write
protected. The least significant bit (bit 0 in register L) corresponds
to drive A, the most significant one (bit 7 in H) tp drive P.
EOS System manual Daeumling
&
Zimmermann
Page 65