Re: -5V on IIgs

["James Littlejohn" <narguthru@yahoo.com>]

On Mar 4, 12:25 am, e...@FreeNet.Carleton.CA (Michael Black) wrote:
> "David Wilson" (mcs6...@gmail.com) writes:
> > On Mar 4, 4:08 pm, "James Littlejohn" <nargut...@yahoo.com> wrote:
> >> I have been going over the schematics of the IIgs, and was wondering
> >> if the -5v line goes to any thing besides the RGB output chip? I can
> >> not find anywhere else where it is used. Will the computer run without
> >> this feed?
>
> > You missed a couple of places. Page 4 UB15 and UB16 (serial output
> > driver chips), Page 7 pin 34 of slots 1-7, Page 8 UL14 pin 11 (sound
> > chip).
>
> > I would not recommend it.
>
> On the other hand, for a long time any drain on a minus voltage in a computer
> has generally been very low.  So you need it, but not very much of it.
>
> LIkely a string of AA's would do fine, or if one wants to get fancy,
> a dc to dc converter to convert the +12 or +5 volt line to -5v.
>
>    Michael

Michael,
You would not hapen to have a schematic for a dc-dc converter for the
-5v, would you?