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From: grr@cbm.UUCP (George Robbins)
Newsgroups: net.arch
Subject: Re: DMA controller chips
Message-ID: <10@cbm.UUCP>
Date: Fri, 17-Jan-86 01:35:26 EST
Article-I.D.: cbm.10
Posted: Fri Jan 17 01:35:26 1986
Date-Received: Sat, 18-Jan-86 09:05:13 EST
References: <171@oasys.UUCP> <431@chalmers.UUCP>
Organization: Commodore Engineering, West Chester, PA
Lines: 26

In article <171@oasys.UUCP> jcg@oasys.UUCP writes:
> >
> >As part of a design for a 80186-based controller, we've been looking at DMA
> >controller chips.  We need four DMA channels (in addition to the two in the 
> >'186) that may all be in operation concurrently.  The peripherals being 
> >interfaced are 8-bit bus oriented, but the '186 has 16-bit wide RAM so we
> >want the DMA to do word assembly/disassembly for us.  We have not been able
> >to find ANY chip on the market which will do the job for us.
> 
> Being american perhaps you don't read european data sheets -:).
> In any case, Siemens manufactures a DMA chip called SAB82258.  Some of the
> features (from the spec):
> 	- 16 bit DMA Controller for ... 80186 ...
> Naturally it handles byte assembly, and disassembly.
> This a new product, but it exists (I have programmed it).  The only thing
> you won't like is the price, about 150$.

Uh, Zilog and AMD make a DMA controller chip known as the 8516 that has two
channels and does byte/work assembly and other useful things.  This also is
a real chip and should cost 10-30$ in quantity.  Contact you local Zilog or
AMD office for more info, I am pretty sure that the documentation describes
how to use it in an Intel environment.
-- 
George Robbins - now working with,	uucp: {ihnp4|seismo|caip}!cbm!grr
but no way officially representing	arpa: cbm!grr@seismo.css.GOV
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)