Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!oberon!bbn!uwmcsd1!marque!uunet!mcvax!unido!tub!tmpmbx!netmbx!hase
From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: (none)
Message-ID: <1968@netmbx.UUCP>
Date: 23 Jun 88 00:42:37 GMT
References: <8806140047.AA18091@ucbvax.Berkeley.EDU>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin
Lines: 14

In article <8806140047.AA18091@ucbvax.Berkeley.EDU> U0179@DGOGWDG5.BITNET ("GWDGV1::WHUEBNER") writes:
>Two questions about ST hardware:
>2) Does anyone know, how far the DMA chip can address in memory ?

I once wrote an adress immediatly after the 4 Megabytes to (physbase).
The system crashed.

The Shifter and DMA chips appear to "borrow" their adress counter from
the "MMU" chip; the registers seem to be 12 bit wide (right, Atari?)

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
High on a rocky promontory sat an Electric Monk on a bored horse. (D. Adams)