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SCPU Information
----------------
The following Information has been
taken from one of the Commodore
Computer club U.K. many Forum topics
http://www.CommodoreComputerClub.co.uk
Here is some information about the
SuperCPU. I wrote this to give an idea
of the hurdles that one might come
across for those who were considering
spending half of their life savings on
one, as follows:
*You will need a heavy-duty power
supply unit. The standard C64 PSU
generally doesn't provide enough juice
to keep things stable, and tends to
burn out especially if you have a
SuperRAM card + RAM. The PSUs for the
flat C128 is okay for your 128, and
can be converted to the C64 - this
will provide ample power for your
computer + any other devices that you
are using. For C128D (Plastic casing)
users, the raised cartridge port will
cause problems, so you'll have to make
yourself some sort of support for the
cartridge, which might mean cutting
off the "wing" on the back of the case
that is below the cart port. C128D-Cr
(metal casing) users won't need to
worry about this, however, make sure
that everything is level (as in, make
sure that the computer has it's rubber
feet still, and your computer is on a
nice, flat and stable surface).
*Look for a SuperCPU 128 even if you
own a Commodore 64. These units are
better able to cope with the
differences between the UK made PAL
C64s, and German made machines and the
NTSC computers. And, if you do upgrade
to a 128 at some point in the future,
you already have a 128 SCPU to use on
it, should you want to. Though the MMU
adapter needs to be installed to use
the 128's native modes @ 20Mhz.
*You will need at least one disk drive
on your system.
*The unit runs hot especially if you
have a SuperRAM card + RAM on your
system. Take the top off it to keep
things cool and everything running
stable. Some people have added air
vents and such like to the casing.
There are also heat sinks available,
and recommended.
*If the red LED on the top of the unit
is in any way 'dull', or not shining
as brightly when in 20Mhz mode as
usual, there is probably a power
problem on your system.
*Every so often, open up the unit and
push down all of the socketed chips.
You can clean the contacts with pure
alcohol and a cotton bud.
*Commodore 128D (plastic casing
especially) users might have problems
with the internal 1571 disk drive.
This is probably due to the internal
PSU not providing enough current to
power everything. Unless you
specifically need a 1571, unhook the
power to the drive, or even remove the
drive completely. Normal, stable
operations should resume. I removed
the internal drive from my 128DCR and
cut the ATTN line as I figured that I
don't really use 5.25" disks anyway.
Cutting the ATTN line on the CR will
make the internal drive invisible -
not entirely sure how it works inside
a 128D.
*I have found the best way to switch
on my computer (my set-up consists of
C128DCR, 1581 Drive 8, RAMLink Drive
9, FD2000 Drive 10 and CMD-HD Drive 11
hooked up to the RL Parallel port) is
to switch the drives on after things
have fired up, in order from Drive 8
through to 11, the RAMLink is on
anyway, unless I've deliberately
disabled it. Doing this seems to cause
the fewest amount of problems.
*Metal Dust is a very good
shoot-em-up... in my opinion.
*Not all games benefit from running in
20Mhz mode - and some games will
either crash or not work at all.
However, you can switch the SuperCPU
out of your system by holding down the
reset lightly for a couple of seconds
whilst switching the unit off - once
the first switch on the left is set to
off, let go of the reset button. If
you can, hold down the CTRL key on
your Commodore whilst doing this.
*I've found that it's often best
setting the SuperCPUs optimisation
mode to "NONE" for most games that
benefit from the extra processing
speed, such as the Freescape games,
for instance.
*If the SuperCPU is not reading the
RAM from your SuperRAM card, try
removing the SIMM and SuperRAM card
and testing the SuperCPU by itself.
Reseat everything firmly. If there are
still problems, the best solution is
to find someone who owns a SuperCPU
and try a chip-for-chip replacement
with their units (providing that they
agree to it, of course), from each
removable chip.
*German made PAL machines tend to run
less erratically with a SuperCPU
attached than their UK-made cousins.
Not that UK-made C64/128 machines
don't work, of course, it's just that
German-made computers seem better -
with the exception to the "Aldi-64",
apparently.
*The performance of GEOS is greatly
improved - which can now be downloaded
for free (www.cmdrkey.com).
*Jos/WiNGS demonstrate the potential
of a Commodore + SuperCPU and a bit of
extra RAM. As reported in Commodore
Free previously, the source code has
been released for people to play with.
*The Retro Replay/RR-Net adapter works
(or, at least the revision of the cart
that I have does), but you must switch
the computer on in 1Mhz mode (or reset
it in 1Mhz mode), load the software
that uses the RR-Net and then switch
to 20Mhz mode. The difference is quite
noticeable.
*New SuperCPU-specific software is
very unlikely to be developed - though
power in numbers. If you want new
SuperCPU software, vote at
www.xeo3.com.
*The world needs a cheap replacement
for the SuperCPU. The CPU64 project by
those IDE-64 people looked very
interesting, but alas nothing has been
heard for ages... hmm, maybe some news
on this soon!
*It's probably not worth buying a SCPU
just to play Metal Dust, though it is
a very good game. GEOS gets the most
out of the device.
*Even the best behaved units can
occasionally freeze and crash. Might
be something to do with the fact that
no one ever intended the Commodore 64
to run at 20Mhz, who knows? Things can
usually be reset, but otherwise,
switch off your system, reseat the
unit in the cartridge port, wait a
minute or so and then turn the
computer back on.
*If you own a RAMLink, keep the timer
jump clip installed and connected to
your RL (The SuperCPU users guide says
that you can remove it). This should
help to keep strange behaviour to a
minimum.
If anyone else has noticed anything
more, no matter how small or
insignificant, please report it on the
Commodore Computer Club (UK) forums -
http://www.CommodoreComputerClub.co.uk
=======