looking for NEC 1165-A manual to change the headload logic

[fritzeflink]

Hi, I've a dualfloppy with NEC FD1165A. The manual on Bitsavers is not exactly for that modell.

In the manual from bitsavers is a jumper for headload to switch the headload signal from headload to drive select.
This is missing on my FD1165-A drive. My problem now is that both drives make headload on every driveselect which
is not what I like.

I would like to change this but the manual from bitsaves has a 'not as good as it should scan' from the sheets and I didn't find any informatins for the µpd D52502 which is used on the drive.

FD1165-A
FD1165-FQ

 

[fritzeflink]

Even the quality of the manual from bitsavers is not as good.

I have these one now: https://oldcomputers-ddns.org/publi...unit_pc-8881bd/nec_fd1165_maintenance_ocr.pdf
and the scann of the sheet is readable.