Re: CFFA Status?

[ziggy <ziggy@fakedaddress.com>]

In article <1h8vlty.jl8ppc1qb5sqsN%bieling@terra.es>,
 bieling@terra.es (Jorge Chamorro Bieling) wrote:

> ziggy <ziggy@fakedaddress.com> wrote:
> 
> > > 
> > > There's still a potential issue of termination power...
> > > Does the RAMFast supply term power unconditionally?
> > > 
> > > And did you have a disk in the Zip and powered up when the
> > > Apple was powered up?  (Obvious, I know, but had to ask.  ;-)
> > > 
> > > -michael
> > > 
> > > Music synthesis for 8-bit Apple II's!
> > > Home page:  http://members.aol.com/MJMahon/
> > > 
> > > "The wastebasket is our most important design
> > > tool--and it is seriously underused."
> > 
> > Yup.. had a disk in there on power-up. 
> > 
> > Powered up the zip first. Then the IIGS.
> > 
> > Tried it with the terminator switch both on, and off.
> 
> What happens with Zips is that they don't supply the (required)
> termination power (that's the termpower pin in the scsi connector), so
> even when you think that the scsi chain is properly terminated it may
> not be so if the scsi card is not supplying it to the DB25's pin 25 and
> the zip is the only device in the scsi chain.
> 
> You can check this easily with a multimeter.
> 
> I there are not +5v in this pin, you can daisychain the zip to yet
> another scsi device that you know that supplies termpower. Most hard
> disks do it. Be sure to check that the scsi ids are different for each
> device in the chain.
> 
> But then, there will be 3 devices in the chain:
> 
> -if the scsi controller card does have a terminator built-in, only the
> last device in the chain needs to be terminated.
> 
> -if the scsi card does not have a built in terminator, both should have
> a terminator either enabled (the zip terminator switch in the on
> position) or plugged (if the hd has an external terminator to plug in).
> 
> -Although, if the scsi chain is short enough, it may work well with only
> only one terninator.
> 
> But remember -as this may be the problem- that the terminator does
> nothing if there's no termination power (+5v) in pin 25.
> 
> Be sure to also check the scsi id settings.
> 
> Good luck.

Ill check for +5 in the morning.. As ive done everything else possible.


This is a RamFast Rev C card that is in there now. The OEM apple card is 
in the 'spare parts' box.