Where's John?

Where's John?

Post by Brian T » Sun, 16 Jun 1991 12:14:57



Can anyone e-mail me John Snow's (of SnowTerm) address where I can reach him
during the summer?  His account at cs.utah.edu as listed in the SnowTerm
documentation is no longer valid.  Thanks in advance.

- Brian

 
 
 

Where's John?

Post by Brian T » Sun, 16 Jun 1991 12:18:38


(It doesn't look like this message got out the first time, so here it is
again... apologies if you've read this already!)

For all the GS hardware types out there: how difficult would it be to patch in
another 64K worth of RAM to the Ensoniq DOC?  Can the memory softswitch on the
DOC be used to "bank-switch" the extra RAM?  Please don't remind me of how my
warranty will magically disappear if I attempt any of this (I probably
won't)... I just want to know if it is technically feasible.

- Brian

 
 
 

Where's John?

Post by Doug Gw » Mon, 17 Jun 1991 13:36:34



>I just want to know if it is technically feasible.

Nope.
 
 
 

Where's John?

Post by Todd P. Whites » Tue, 18 Jun 1991 20:04:01




>>I just want to know if it is technically feasible.
>Nope.

Gee, at least tell him why. A raw 'nope' is really unhelpful.

It's technically feasible, although it is not something to try unless you
know what you're doing. If no one does it over the summer then I might try it
when I get back (I'll want my roommate's oscilloscope) and then I can give
people cookbook instructions. In any case, it requires some permanent warranty
killing modifications to the motherboard unless you want to invite disaster,
so caveat usor.

According to the schematics, all the signals are available (but you'll have to
figure out which of the two unconnected DOC pins to use, and what -- if any --
timing requirements it has). Practically, however, it'd be a * unless you
want to desolder the DRAMs and replace them with sockets (get nice machined
ones that can be soldered to the motherboard on both sides). You'd also need
a test clip or two to get the bank-select signals from the DOC and elsewhere.

To figure out which DOC pin is being used as the bank select (I suspect that
one of the unconnected DOC pins, probably "BS", is the bank select bit and
that you can pick from two pairs of DRAMs with it), find an oscilloscope and
write some test programs with the DOC (not for the squeamish) and watch the
outputs while comparing them to known ones like the DOC's RAS and the GLU's
CAS line.

To hook up the real test setup, replace both DRAMs with machined sockets and
make a test board that plugs into them and has room for four DRAMs (wire a
pair of DRAMs to each socket in parallel, except for the CAS and OE lines
which will probably need to be decoded according to which bank is being
accessed). Use test clips to get the necessary signals from the DOC and
elsewhere (you may have to use something cheesy like an announciator output
if the Sound GLU bank bit is not available in the hardware (and it is a PLCC
so attaching a jumper to it could be * in any case). It would be nice if
the extra bank were enabled by the reserved bit in the Sound GLU, but don't
count on it. The sound tools don't have any way to specify the extra bit anyway
so you'd have to set it between DOC RAM loading calls or write your own sound
software anyway.

Todd Whitesel

 
 
 

Where's John?

Post by John Sn » Tue, 18 Jun 1991 09:36:22



>Can anyone e-mail me John Snow's (of SnowTerm) address where I can reach him
>during the summer?  His account at cs.utah.edu as listed in the SnowTerm
>documentation is no longer valid.  Thanks in advance.
>- Brian

The following address should work:


--
-----------------------------------------------------------------------------


Salt Lake City, Utah                 America Online: JohnSnow  GEnie: J.SNOW2

 
 
 

Where's John?

Post by Doug Gw » Tue, 18 Jun 1991 23:02:36



Quote:>The sound tools don't have any way to specify the extra bit anyway
>so you'd have to set it between DOC RAM loading calls or write your own sound
>software anyway.

I think the 16-bit address space assumption is so much wired into the GS
sound subsystem that it makes any attempt to extend it infeasible except
maybe for Apple, who are in a position to support such an extension.
 
 
 

Where's John?

Post by Brian T » Wed, 19 Jun 1991 11:11:19




> >Nope.

> Gee, at least tell him why. A raw 'nope' is really unhelpful.

    Thank you, Todd.  8-)

Quote:> It's technically feasible, although it is not something to try unless
> you know what you're doing.

    I won't be the one doing the surgery on the GS, but your post will be
forwarded to those who are interested in attempting this.

Quote:> The sound tools don't have any way to specify the extra bit anyway
> so you'd have to set it between DOC RAM loading calls or write your
> own sound software anyway.

    None of the current crop of sound software will recognize the extra 64K
of RAM anyway, and SoundSmith is the only application I can think of that
would really benefit from it.  Interesting to see how the DOC behaves with
twice the RAM though...
 
 
 

Where's John?

Post by Stephen Bro » Wed, 19 Jun 1991 02:00:04



>(It doesn't look like this message got out the first time, so here it is
>again... apologies if you've read this already!)

>For all the GS hardware types out there: how difficult would it be to patch in
>another 64K worth of RAM to the Ensoniq DOC?  Can the memory softswitch on the
>DOC be used to "bank-switch" the extra RAM?  Please don't remind me of how my
>warranty will magically disappear if I attempt any of this (I probably
>won't)... I just want to know if it is technically feasible.

>- Brian

If the Ensoniq chip generates the high order address, then it's probably
possible. I'll hack YOUR IIgs motherboard Brian, not mine. (I'm pretty good
with a soldering iron, but for an extra software-UNsupported 64K of memory,
I'm not doing the hack on MINE)

+---------------------------------------------------------+
| Stephen Brown                           Toronto, Canada |

+---------------------------------------------------------+
| Apple II Forever !!!                                    |
+---------------------------------------------------------+
| Like my new .signature. ?    Too bad.                   |
+---------------------------------------------------------+

 
 
 

Where's John?

Post by Andi So » Thu, 20 Jun 1991 04:44:11



        What would be the benefits of an extra 64K of RAM?
----


UUCP:     crash!pro-nbs!asong

 
 
 

Where's John?

Post by Andy Ste » Wed, 19 Jun 1991 07:41:09



    Well, there's someone named Harold Somethingorther on America Online
who figured out how to expand the Ensoniq's RAM to 128K, and he was going
to sell it as a package, but I think he decided not to.  However, if you'd
like, I'll forward E-mail to him, and ask him if he'll give you the
instructions on how to do it.  Remember, though, it'll be at your own risk.
This is probably highly unstable and may cause cumbustions or explosions,
or other * things that make your insurance skyrocket. :)

 
 
 

Where's John?

Post by Andy Ste » Fri, 21 Jun 1991 06:15:38



    It's certainly technically feasable.  It's been done.  The guy's just
not sure whether he'll be able to market it.

 
 
 

Where's John?

Post by Brian T » Sun, 23 Jun 1991 12:14:16



> If the Ensoniq chip generates the high order address, then it's probably
> possible. I'll hack YOUR IIgs motherboard Brian, not mine. (I'm pretty good
> with a soldering iron, but for an extra software-UNsupported 64K of memory,
> I'm not doing the hack on MINE)

    Heh heh.  Thanks, but no thanks, Stephen!  I've already had a couple
offers here to perform similar surgery to my GS.  :)
 
 
 

Where's John?

Post by Brian T » Sun, 23 Jun 1991 12:19:37




>         What would be the benefits of an extra 64K of RAM?

    More room for instrument wave banks, for one thing.  64K isn't a whole
lot if you want really nice sampled instruments.  The best piano waveforms
on some synths can occupy a meg of RAM (i.e., each key is sampled
separately).  The point is moot, however, since nothing currently supports
128K of Ensoniq RAM...
 
 
 

Where's John?

Post by Daniel Zimmerm » Sun, 23 Jun 1991 19:36:43




>         What would be the benefits of an extra 64K of RAM?
> ----


> UUCP:     crash!pro-nbs!asong


Well, an extra 64k of DOC RAM, if it was supported by Apple, would allow
more and larger waveforms to be loaded into DOC RAM.. This would allow loading
of many complex SoundSmith instruments without compression, for example. It
would also allow more of a digitized sound to be loaded into DOC RAM which
would reduce the amount of time used to copy parts of the waveforms of
digitized sounds into the DOC RAM. Basically, it would just make life easier
for the Sound Tool Set and the Note Sequencer/Synthesizer tools.

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