Manuals / jumper map for NEC FD1165 with G9NYB PCB

[Tony Duell]

> Thankfully the power connector was labelled -- thank you NEC! 
> Unfortunately the two DIL terminator resistor packs have been snaffled, 

Or maybe it wasn't the last drive on the cable when it was last used.

> and I'd rather like to know if the G9NYB used the same 150-ohm resistor 
> pack the G9NYF used before I go installing a bunch of MR25 resistors in 
> their place (seeing as I haven't got any 150R x8 DIL packs)

They're almost certainly 150 ohm. The only thing to work out is thwe 
connections.

The termination resisotrs go from a signal to Vcc (+5V). I would start by 
buzzing out the +5V line to the p[ins on the terminator socket. If you 
find all one column are +5V, then the terminator is 8 idividual 
reissotrs. If +5V goes to pin 16 only, then it's more likely to be 15 
commoned resistors (with the common to pin 16). The latter are much 
harder to find in my experience (having just had to obtain a 16 pin DIL 
pack of 15 commoned 220R resistors...).

If you find that pin 16 goes to +5V nd pin 8 is ground, then it's quite 
possible that the rrsitor pack is a potential divider type network (say 
330R to +5C and 220R to ground on each of the rrmaining 14 pins). Such 
networks are rare in floppy drives btu common in other devices.

I wouldn;t solder any resisotrs to the PCB. Yo umay well want to remove 
the terminator at some point. Use a DIL header plug if you can't get he 
right DIL network.

-tony


> 
> Thanks,
> -- 
> Phil.
> classiccmp at philpem.me.uk
> http://www.philpem.me.uk/
>