Hi,
damned rule that I must write from the account I'm also
subscribed. Since this obviously got rejected, I resend it.
Spiro.
----- Original Message -----
From: "Spiro Trikaliotis" <spiro.trikaliotis@gmx.de>
To: <cbm-hackers@cling.gu.se>
Sent: Friday, January 18, 2002 8:33 AM
Subject: Re: MAX-carts
> Hi Ruud,
>
> you wrote:
>
> > http://home.austarnet.com.au/avcaz/max/max.htm
> >
> > Not being familiar with the MultiMax hardware it seemed a nice way to learn
> > about it. I replied to a message with the following but never got a reply :(
>
> Oh, I can see an answer by Andreas Boose in the newsgroup:
>
>
> --- snip ----
>
> Path: uni-berlin.de!fu-berlin.de!news.fh-hannover.de!linux.rz.fh-hannover.de!boose
> From: Andreas Boose <boose@linux.rz.fh-hannover.de>
> Newsgroups: comp.sys.cbm
> Subject: Re: MAX Cartridge Update
> Date: Mon, 14 Jan 2002 23:54:51 +0100
> Organization: [posted via] Fachhochschule Hannover
> Lines: 22
> Message-ID: <Pine.LNX.3.96.1020114233719.22896F-100000@linux.rz.fh-hannover.de>
> References: <a1olbf$2bel$1@austar-news.austarnet.com.au> <a1pcb9$s8cdg$1@ID-56208.news.dfncis.de>
> <a1r7f9$c72$1@austar-news.austarnet.com.au> <a1uhve$mk113@sunsv007>
> NNTP-Posting-Host: linux.rz.fh-hannover.de
> Mime-Version: 1.0
> Content-Type: TEXT/PLAIN; charset=US-ASCII
> X-Trace: news.fh-hannover.de 1011048893 23549 boose 141.71.1.44
> X-Complaints-To: news@news.fh-hannover.de
> In-Reply-To: <a1uhve$mk113@sunsv007>
> Xref: uni-berlin.de comp.sys.cbm:176714
>
>
>
> On Mon, 14 Jan 2002, Ruud Baltissen wrote:
>
> > Studying the photos the first thing I noticed was that pin 5 of the
> > expansionslot, the R/W line, is not connected. Very strange when there is a
> > SRAM onboard. Pin 21 of the SRAM is the R/W-input and is connected to the
> > DMA-input. The CS- and OE-pin of the SRAM are connected to I/O1. I/O2 goes
> > to jumper J5 and through the solderpad to EXROM I believe?
>
> As this is a MAX cart, it obviously expects a MAX machine to be connected
> to. There it would be connected to CNT of the CIA (-DMA is a C64 thing).
>
> This is still pretty weird, as it requires starting the serial shifter
> everytime the cart's RAM is written. But at least this saved hardware
> costs gating the SRAM R/-W input, as directly connecting the R/-W line of
> a static RAM to the 6510's R/-W line is not possible. Inside the MAX
> machine, the R/-W gating for its SRAM is done by the 6703, but this signal
> is not available at the expansion port.
>
> MfG Andreas
>
>
>
> --- snip ----
>
> Regarding the other mail you wrote, I'll have a look today or tommorow
> (I hope).
>
> Spiro.
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