Re: How-to Nibble dump??

[russotto@wanda.pond.com (Matthew Russotto)]

In article <3a8865be.2929027@news.wi.centurytel.net>,
Theusch Family <ntohsepuasmch@centurytel.net> wrote:
>Hello experts.
>
>I was wondering if someone could explain the way the RWTS (etc.)
>fetches raw nibbles from a disk controller card. What do the locations
>$C0E0-$C0EF have to do with this?

A book called Beneath Apple DOS is what you want.  More than you ever
wanted to know, unless you really want the details on NRZi recording
and the P6/P6A state machine.

>Also, how do you access the SSC from assembly?  What do the locations
>$C0A0-$C0AF have to do with this?

For this, you'll need the SSC technical manual.  Those locations
(assuming the card is in slot 2) are probably mapped to registers on
the serial chip used in the SSC.


-- 
Matthew T. Russotto                                russotto@pond.com
"Extremism in defense of liberty is no vice, and moderation in pursuit
of justice is no virtue."