o What is CPU Doubler?

CPU Doubler is a performance enhancement utility for the 
Macintosh. It will increase the performance and responsiveness 
of your computer by as much as 100%. This will result in a faster 
computer, making the computer more efficient in running all of 
your applications.

CPU Doubler is a control panel and is entirely implemented in 
software. There are no hardware add-ons or modifications that need
to be made for the increased performance. CPU Doubler does not 
patch the system extensively, thus ensuring maximum compatibility.

CPU Doubler requires system 7.0 or higher and uses very little RAM
and hard disk space. It will yield the same performance boost on 
either a 68K or Power PC Macintosh. CPU Doubler works with the 
entire family of 680x0 processors (68000, 68020, 68030 and 68040) 
as well as any of the current Power PC processors, thus working on
any Macintosh ranging from a Mac Plus to the latest Power PC.


o How does it work?

CPU Doubler achieves its performance enhancement by properly 
managing the computer's throughput. Throughput is defined by the 
amount of time the processor spends executing process 
instructions. A process is any piece of software that performs 
some function on your computer, independent of the system. All 
applications run as processes. Some system extension, such as file
sharing, also run as processes, albeit hidden ones that the user 
never sees.

There are two ways a processor can waste time. It can waste time 
sitting idle, or it can spend too much time swapping processes in 
and out.

1) By sitting idle the processor wastes valuable cycles that are 
not used to execute your application code.

2) If too much time is spent swapping processes in and out, then 
the overhead associated with the swapping causes the processor to 
spend valuable cycles setting up registers and memory for each 
process that is swapped in as well as cleaning up registers and 
memory for each process that is swapped out.

CPU Doubler increases the computer's throughput via a proprietary 
scheduling algorithm. System 7 has a fairly simple scheduling 
algorithm which gives equal time to each process. Each application
can increase or decrease the amount of processor time that it 
gets, but there is no sophisticated load management scheduling 
that tries to give optimal throughput.

CPU Doubler modifies the existing scheduling algorithm, without 
replacing it completely. This is done for backward compatibility. 
By patching the system's existing scheduler, both optimal 
performance and compatibility is achieved.


o Can I customize it to fit my needs?

CPU Doubler can accommodate different computer needs. It can be 
configured within a wide range, either giving most of the 
processor's cycles to the currently running process, or only 
giving a slight improvement in user performance with minimal 
impact on background processing. Additional options exist to 
exclude all faceless background applications as well as the 
Finder/System.

A key feature of CPU Doubler is that it lets users customize 
performance to fit their needs. By setting individual process 
priorities, users can perform their own load balancing, finally 
giving users the ability of job control found in other 
multitasking operating systems such as UNIX and OS/2.

There is even a history feature with which to set priorities of 
non-running applications so that future use will yield the 
desired result.


o What kind of performance boost does it give?

The performance boost that CPU Doubler will yield really depends 
on how you use your machine. Since CPU Doubler speeds up your 
machine by optimizing the amount of time the processor spends on 
your application, it needs to be able to siphon processor cycles 
from other processes.

Most Macintosh computers have multiple processes running at any 
one time. Even if the user is running only one application, such 
as a word processor, there are usually other hidden processes 
running. These are sometimes created by system extension at 
startup, and sometimes by other applications. Even the Finder 
takes up CPU cycles. All these CPU cycles add up and slow down 
the overall performance of the computer.

If you boot your computer with extensions off and only run one 
applications at a time then CPU Doubler probably won't give you 
any significant speed boost-the only thing it can do in this case 
is take cycles away from the Finder. However, in most cases CPU 
Doubler will be able to find plenty of processes to siphon cycles 
from, thus ensuring better performance.

At no time will CPU Doubler slow down your machine.


o Will it work with other speed enhancing utilities?

CPU Doubler speeds up your Macintosh by making the system software
run more efficiently. It is totally dependent on the system 
software and not the underlying hardware. Other speed enhancing 
utilities, implemented in either hardware or software, actually 
try to make the underlying machine run faster so that the system 
that runs on top of it will speed up as well. Combining CPU 
Doubler with these speed enhancing products will give a combined
performance boost making the system faster and more efficient.

In some cases, speed enhancing utilities will improve the 
performance of a particular part the system, such as disk caching 
utilities. Combining this type of utility with CPU Doubler will 
also result in a combined performance boost, since both will work 
independently to increase system efficiency.


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CPU Doubler is available now from Orchard Software, Inc. for a 
special introductory price of $47.95, a 40% savings from its 
$79.95 retail price. An additional $3 shipping charge (overseas 
shipping is $7) must be added. MA residents must add 5% sales tax.

Included with the package is a detailed manual describing how to 
use CPU Doubler. There is also a complete on-line help system that
is accessed at the click of a button.

CPU Doubler also includes with it a free copy of Cron Manager(tm),
our chronological event management utility, which retails for 
$26.95.

For further questions you can contact us at the address below or 
by sending us email at:

	102670.1653@compuserve.com

To order CPU Doubler, please send a check or money order made 
payable to:


	Orchard Software, Inc.
	P.O. Box 380814
	Cambridge, MA 02238-0814
	(617) 876-4608