Re: Daisychaining 5.25 " Drives

["mdj" <mdj.mdj@gmail.com>]

Bill Garber wrote:

> The IWM is more than a Disk II. It is
> actually a Smart Port, just like the
> one in the IIgs.

I think it depends on which "IWM" you look at: The original //c was
much the same electrically as a standard 5.25" controller card, except
it had an external interrupt input.

The later iterations used on the IIGS and IIc+ had additional signals
to activate either the 3.5" or 5.25" drives in the chain.

The limitations of the original IWM in the //c didn't prevent it from
controlling "intelligent" devices like the UniDisk 3.5" and the CT20c
hard disk. The specifics of how this worked without interfering with
two 5.25" disks on the same chain is what I am interested in.

Matt