TURBO Master CPU
      4.09 MHz Accelerator Cartridge

Brief Product Description

Turbo Master CPU is a sophisticated yet
easy-to-use cartridge which includes an
on-board replacement microprocessor 
(CPU) and simply plugs into the 
expansion port to give your C64  
computer four times faster processing 
speed.  Thus your software actually 
runs four times as fast.  In fact, the 
processing speed is nearly twice as 
fast as a standard IBM-PC/XT clocked at
4.77 MHz!  In addition, Turbo Master 
CPU includes 'turbo' disk routines in 
ROM for five times faster disk Load and
Save, and a convenient DOS 'wedge' in 
ROM. (However, Turbo Master CPU should 
not be confused with other so-called 
accelerator cartridges or Kernal ROM 
replacements which merely speed up the 
disk drive.  Turbo Master is much 
more.)

What to Expect

Quite simply, your programs will fly.  
Screen graphics (including GEOS 
screens) are greatly accelerated.  Word
processors scroll, search-and-replace 
and insert much faster.  'Number 
crunching' and spreadsheet 
recalculation take one-fourth the time.
 At first you won't believe your eyes. 
Then you'll get 'hooked' and be unable 
to compute without Turbo Master CPU.

Price and Guarantee

The introductory price is only $199, 
shipping prepaid to US addresses.  
Order directly by telephone or mail.  
Visa and Mastercard accepted.  Ten-day 
satisfaction or money back guarantee.  
Order now.

Softare Compatibility

Turbo Master CPU is compatible with 
nearly all Commodore C64 software.  
This includes programs written in 
Basic, machine-language programs, GEOS,
programs which move screen memory, and 
bit-mapped graphics screens.  The main 
limitation is that the few 
assembly-language programs which use 
'illegal' or undocumented 6502 op-codes
will not run because Turbo Master CPU 
uses an enhanced 65C02 microprocessor 
in which many previously undocumented 
op-codes are now officially assigned as
useful instructions.  Fortunately such 
programs are rare.

Computer Compatibility

Turbo Master CPU is intended for 
Commodore 64 and 64C computers.  It 
also works with the SX-64 portable, as 
well as the C128 (in C64 mode).  The 
'turbo'disk Load and Save routines are 
for a 1541 disk drive, or close 
compatible.  The 'turbo' disk routines 
can easily be turned off if you are 
using a different drive, and you will 
still have the benefit of the four 
times faster processing speed.  
Cassette tape cannot be used with Turbo
Master CPU.  (The slow cassette tape is
inconsistent with anything 'turbo'.)  
Turbo Master CPU can be used with 
Schnedler Systems data acquisition and 
control interface boards.  Turbo Master
CPU is compatible with the GEORAM 512k 
Memory Expansion from Berkeley
Softworks when used with a cartridge 
expansion motherboard and a replacement
power supply.

Physical Size

Turbo Master CPU is nearly exactly the 
size of a Commodore 1764 Ram Expansion 
Unit.  Is has a metal case 
approximately 4 1/2 x 5 1/2 inches, 
with a gold-plated circuit board edge
connector extending about 1 1/2 inches.

Technical Details

In addition to a Rockwell R65C02P4 
microprocessor clocked at 4.09 MHz,
Turbo Master includes its own 64k of
fast static RAM (120 ns) and a 32k 
EPROM.  The on-chip port on the regular
6510 processor in the C64 is emulated 
with TTL logic for bank switching.
There are 16 ICs in total.  In fact, 
Turbo Master CPU is practically a 
complete 64k microprocessor, lacking 
only a keyboard and screen.  During 
operation of Turbo Master CPU, the 6510
microprocessor in the C64 is completely
bypassed, while the VIC (video) chip, 
Sid (sound) chip, keyboard and serial 
bus port are all accessed by Turbo 
Master CPU and operate normally.  The 
6526 CIA timers in the C64 continue to 
be clocked at their usual 1.0225 MHz 
rate.  Speed change between the 
standard 1.0225 MHz processor clock 
rate and the fast 4.09 MHz clock rate 
can be accomplished either manually 
using the switches, or by software.  
(The software speed switches Bit 7 of
memory address $00.)  Assembly-language
programmers can use the full enhanced 
65C02 instruction set, and we have a 
65C02 assembler available (MAE).

ROM 1 / Rom 2 Switch

You will notice a switch for selecting 
either ROM 1 or ROM 2.  These are two 
versions of the C64 Kernal.  ROM 1 is a
'feature' ROM.  The cassette tape 
routines have all been removed and 
replaced by fast disk Load and Save 
routines and by a DOS wedge.  ROM 1 is 
highly compatible with most programs.  
ROM 2, which is a 'compatibility' ROM, 
is nevertheless provided.  The cassette
tape routines are present, but are 
disabled.  ROM 2 does not have any 
extra features compared to a standard 
C64 Kernal ROM, but you still have the 
benefit of four times faster processing
speed.

JiffyDOS Compatibility Option

An excellent disk speed up that works 
well in combination with the Turbo 
Master CPU processor accelerator to 
give you the best of both worlds is 
JiffyDOS from Creative Micro Designs 
(P.O. Box 789, Wilbrahan, MA 01095; 
telephone (413)525-0023).  JiffyDOS 
differs from a simple 'turbo' disk load
and save in that it also speeds up disk
operations from within programs.  
JiffyDOS does not require cables, but 
it does require you to replace ROMS 
inside your computer and inside your 
disk drive.  Here's the deal: If you 
have or are buying JiffyDOS from 
Creative Micro Designs, tell us and we 
can supply a Turbo Master CPU with a 
JiffyDOS-compatible ROM in the 'ROM 
1'switch position in place of our 
standard 'feature' ROM at no additional
cost.  Note that you must have the
basic JiffyDOS system from Creative 
Micro Designs for this option to be of 
benefit; otherwise you will not have a 
fast loader at all without our 
standard ROM 1.

Manual and Disk

Operation of Turbo Master CPU is quite 
simple and nearly self-evident.  A 
single sheet of instructions would be 
enough.  Nevertheless the manual is 24
pages in length, in an attempt to place
in your hands all the information you 
might need.  A disk is included with a 
few demo and utility programs, as well
as text files for assembly-language 
programmers documenting the enhanced 
65C02 instuction set.


Address and Phone Number to Order:

Schnedler Systems
25 Eastwood Road
P.O. Box 5964
Asheville, North Carolina 28813

1-(704)274-4646

Shipment from stock within 24 hours via
UPS.

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            My Comments
 
 We have tried it and as far as 
speeding things up, it does work well!
 But when used with the bbs, when the 
board resets the send and receive 
lights flash and the modem never resets
or you get a 'no modem' message. If 
there is any change or we do get it 
working i will update my comments on 
the cpu...
 Well thats it for this month. I hope 
you enjoy it and we'll see you again 
next month.
 
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 If there is anything that you would 
like me to check out or put in leave me
mail explaining what you would like to 
see.
 
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             Angelo
             The Commodore Den
             201-341-0945
             New Jersey Info Line
 

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