Sharp mz-3500 Manual For Use page 282

Section B:
Hardware interface
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8 -
Move Drive Head to Track 00
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On entry:
On exit :
The read/write head of the currently selected drive is returned to
zero. This function call, however, does not perform a physical
access, only internal variables are set.
Example:
LD C,50
EOS
function code
LD
DE,PARAMS Parameters
CALL
5
Call
EOS
PARAMS:
DB 8
Hardware function No.
DB
0
DW
0
DW
0
DW
0
track
disk
EOS System manual Daeumling & Zimmermann
Page 144