Conference hydra::amiga_v1

3652.0. "Need Help with COMPRESS.EXE" by AKOV11::SMITH (Reality, just a visible imagination?) Thu Apr 05 1990 14:59

I extracted the A500 /14MHZ 68K note from comp.sys.amiga.hardware.  It included
a uue/compressed schematic of a circuit to run your 68K at 14mz but keep the
rest of the system at 7mz.

I got the UUDECODE to work fine but when uncompressing it complains that the 
image is 16 bits and COMPRESS only handles 13 bits.  Does anyone have a utility
that will uncompress this 16 biter?

AKO539> uudecode 2000_SPEED.UUE
AKO539> dir/since

Directory AKO539$DUA1:[SMITH.AMIGA]

2000_SPEED.UUE;3                              12   5-APR-1990 10:39:10.05
ACCEL.PIC_Z;1                                  8   5-APR-1990 10:39:34.95

Total of 2 files, 20 blocks.
AKO539> compress -d ACCEL.PIC_Z
stdin: compressed with 16 bits, can only handle 13 bits
%NONAME-W-NOMSG, Message number 00000000
AKO539>

Heres the note from comp.sys.amiga.hardware:



--------------------------------------------------------------------------------
          <<< FRSOLD::IS$NOTES:[NOTES$LIBRARY]AMIGA_HARDWARE.NOTE;1 >>>
                    -< comp.sys.amiga.hardware - postings >-
================================================================================
Note 425.0                      A500/14 MHz 68k?                      No replies
FRSOLD::ZIMMERMANN "nunki.usc.edu!aliu"             205 lines   3-APR-1990 09:28
--------------------------------------------------------------------------------
Path: shlump.nac.dec.com!ryn.esg.dec.com!decvax!decwrl!wuarchive!usc!chaph.usc.edu!nunki.usc.edu!aliu
From: aliu@nunki.usc.edu (Terminal Entry)
Newsgroups: comp.sys.amiga.hardware
Subject: A500/14 MHz 68k?
Summary: comments?
Keywords: 14MHz 68k, A500
Message-ID: <8903@chaph.usc.edu>
Date: 1 Apr 90 02:15:34 GMT
Sender: news@chaph.usc.edu
Organization: La Cosa Nostra
Lines: 193
 
Howdy.
 
Can someone knowledgeable of the amiga hardware (possibly someone at
commodore) comment on the compatibility of installing a 14 MHz 68000
in an A500 as described in the following text? 
(note, it is included here, since it is only the size of the average 
flame post)
 
I am interested in any problems it may create, and on how you can identify
problem disk drives. (see text).
 
+=============================================================================+
| "The computer is down, I hope it's something serious." - Stanton Delaplane  |
+=============================================================================+
Veni, Vidi, Visa  *   Freeware Signature v1.4 (or 2.0?)  *  Cogito Ergo Dim Sum
 
----------- CUT HERE ---------
 
 
          Amiga 500 processor accelerator project
                                        by Leslie Ayling
                                        p.o. box 334
                                        GLEBE 2037
 
     Welcome once again to cheapskates corner, where we try and buy the world
for a song. This time around we shall increase the speed of the processor to
just over 14Mhz, double the standard speed, for under $25 !!!!
 
     You will need the following -
 
1. an MC68000p12A 16MHz processor. These are available in Sydney from VSI
   electronics, 16 DICKSON ave ARTARMON 2064 ph (02)4398622  cost is $18.90
   plus tax ($22.68 tax inc.)
2. a 74F74 D type flip flop. Geoff wood at Lane Cove or Rod Irving should
   keep them.
3. a few short lengths of hook-up wire.
4. a SPDT switch.
 
Refer to the accompanying circuit diagram
Note: Keep the leads to the switch as SHORT as possible.
The circuit is relatively straight forward. the 74F74 is wired as a positive
edge triggered divide by two circuit, which provides the alternate clock
frequency of 14.18Mhz approxiamately. The old 68000 8Mhz processor is removed
and replaced with the 16Mhz version which has is clock pin (15) bent out
horizontally so we can connect our new circuitry to it. The SPDT switch
either connects the normal 7Mhz signal or the new 14Mhz signal to the 68000's
clock input.
The switch can be changed while the machine is on, however it will simply
lock up. Just reset as usual from the keyboard once you have changed speed.
 
I have a revision 5 board with new 1.3 roms which cope with the new speed
quite happily. Using the program CRAMDEN-SI from MEGADISC 10 to compare the
difference the mod makes : the standard position gives-
 
performance relative to amiga 1000 : 1.0
performance relative to ibm pc/xt  : 3.2
 
On high speed the performance is-
 
performance relative to amiga 1000 : 1.7
performance relative to ibm pc/xt  : 5.2
 
so roughly a 70% increase in performance.
Even though the clock speed is doubled to the processor, the performance
dosen't increase to 2.0 because the agnus and the other support chips are
still running at the same speed as before thus holding the processor up for a
slightly higher percentage of the total time than before.
 
This mod basically gives the same capability as the CMI accelerator board
priced at $399 in sydney, with the exception that it isn't software
controlled. However when it's only costing 1/16th the price one cant really
complain!!.
If you have any queries or would like the mod installed in your machine,
either contact me direct or via Megadisc.
 
The machine should work on the 1000 and 2000 however the pin numbers may be
different. I suggest you compare the a500 schematics with that of your
machine and make note of the differences.
Hope this is of some help...........regards   Leslie Ayling.
 
#addendum#
One machine this mod was carried out on had trouble with the one of the disk
drives at high speed. It appeared to be trying to step the head of the
internal drive faster than the drive could physically move and refused to
boot.
 When I connected a drive with a 5ms track-track access time and booted
off of it the problem dissappeared. I have a patch for this problem for
normal DOS disks to slow down the step rate which sits in the boot sector. It
may be a problem however for protected software or non-standard boot sector
type programs.
 Don't despair however the patch is very small and should fit
in somewhere anyway. Just drop me a line. If your machine exhibits the
problem, the patch disk is available DIRECT from me with various usefull disk
speedup utils and a Trackdisk step-rate alteration program, plus loads of
other priceless information on gurus, reset program flow, diagnostics all on
an ARP1.3 system disk for the princely sum of $5 !! There should be no
problem with HARD disks however if anyone encounters any please let me
know........thanks.
 
---- PIC FOLLOWS, UUDECODE and UNCOMPRESS ----
 
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end

    
    I've got a 16 bit compress going on the Amiga and VAX which I have been
    using for some time when I transfer text files back and forth.  For a single
    text file, compress beats every archiver I've seen.  The one which comes
    closest is LHARC, but even then compress usually wins by a few blocks.  I'll
    upload an archive of the two exe's and source tonight...
    
    stay tuned
    
    steve

    I can do better than that ...
    
    I have the original Disk magazine that this article was in including
    the IFF picture of the circuit diagram. I'll upload both the article
    and the picture when I get home tonight.
    
    Shaun.
    

    Well, anyhow maybe someone else would like it...
    
    I put compress.arc in tape::user2:[upload].  This contains
    
    	compress.c - dave wecker's compress sources slightly modified
    			compiles with Lattice, possibly with MANX
    	compress   - amiga executable
    	compress.exe - vms executable
    	compress.doc - says it all but...
    
		I changed the amiga version to also append "_z" to the file
    		name when the file is compressed.
    
    To use this on VMS you need to define a "foreign" command:
    
    	compress :== $your_disk:[your_dir]compress.exe
    
    - steve

Thanks Steve,

I give it a try today...

re: .2  Yes please upload the whole article.  More details than are provided
in the usenet article would be greatly appreciated.


...Ed

    Sorry 'bout the wait but the system was down ...
    
    (Well the excuse worked on my customers !!!)
    
    
    I finally uploaded the original text on how to speed up the processor
    to 14Mhz which accoring to the author results in a 80% speed increase!
    
    The file is called CHEAPACC.LZH and has been uploaded to :
    
    TAPE::USER2:[UPLOAD] 
    
    It contains several files:
    
    The compacted text file with the information on how to build the
    project.
    The compacted IFF picture file with the circuit diagram.
    
    Both of these files files can be viewed with the program most which I
    have also included.
    
    Shaun.