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From: spencer@eris.BERKELEY.EDU (Randy Spencer)
Newsgroups: comp.sys.amiga
Subject: Re: Compatibility problem(s) with A500?
Message-ID: <4071@jade.BERKELEY.EDU>
Date: Wed, 24-Jun-87 02:48:44 EDT
Article-I.D.: jade.4071
Posted: Wed Jun 24 02:48:44 1987
Date-Received: Sat, 27-Jun-87 07:45:12 EDT
Sender: usenet@jade.BERKELEY.EDU
Reply-To: spencer@eris.BERKELEY.EDU (Randy Spencer)
Organization: University of California, Berkeley
Lines: 101

In article <8796@amdahl.amdahl.com> kim@amdahl.amdahl.com (Kim DeVaughn) writes:
>
>[ "Send lawyers, guns, and money ..." ]
>
>Seems that just about the time Digi-Paint was "ready to ship", New-Tek
>got their developer A500/A2000 machines in.  Naturally, they tested
>Digi-Paint with the new machines, and found that it wouldn't run correctly
>on the A500.
>
>The problem(s) were traced to Digi-Paint not working correctly with the
>A500's extra "slow fast ram" (sorry, I just *have* to call this kind of
>memory "half fast ram" :-) ).  Since discovering the incompatibilities,
>they've been busily changing their code to accomodate "half fast".
>
>UUCP:  kim@amdahl.amdahl.com

Actually this is a very interesting point (oh, Hi all, good to be back,
I have been having some feed problems, like no disk space).

I don't usually like to talk about things going on at work, but We (meaning
Infinity Software) just got our developer machines (thanks CATS) and we
put our tennis simulation game both the 500 and the 2000.  The 2000 ran just
like one might expect, like a 1000, but the 500 ran noticably slower than 
the 1000 or 2000 did.  So we figured that we had contention on the Chip buss
with program code.  So we took the memory board out of the 2000 and ran the 
program again.  Still as fast as ever, but it ran slow on the 500.  The
graphics are animated BOBs and the 500 is unexpanded (512K in other words).

I don't know, but it seems like a not completely compatible machine if it
has different timing.  I don't know what caused it.


Oh, on to bigger and better subjects:

I had to speak to Carolyn today and she helped me put my 2000 together,
and I thought I would share my expirence on the net so that she don't 
have to tell thousands of people the stuff that she told me.

I wanted to add a second internal disk drive to the 2000 and I looked
inside and there was already a power cable and a ribbon cable set up.
So I took a drive out of a 1000 and hooked up the cables to it.  But
when I booted the machine I discovered that it now didn't recognize
either df1: or df0:  So I looked at the drive I had put in as df1: and
there was a unit number jumper so taking a clue I moved it from 0 to 1.
I booted this again and it was back to recognizing df0:, only when
df0: was running the motor for df1: was also turning.  Weird, I
thought, so I called Carolyn and asked, she said to look under the
power supply, there is a jumper there labeled J36.  It should be
unjumpered.   This controls wheather or not the second drive gets
power (I think).  I jumpered J36 and re-booted and boom, up and
running!  If you want to try this yourself, recognize that you will
need lifters (or spacers) to go around the screws that hold the drive
assembly to the chassis.  The lifters raise the drive up to where the
mounting hole is, and also keep it from shorting or dragging on the
mounting bracket.

Ok, so that is half of my story.  While Carolyn had me on the phone
she said "want to know how to increase the memory in the 2000?".  So I
said "yeah" and she directed me to look at the memory board that ships
with the machine.  This is the German 2000 now, so all you who bought
West Chester machines, this doesn't apply to you.  The German machines
ship with 512K of memory plugged into the CPU slot.  There are also
sockets for some 41256's.  I got 16 of them together, ready to
install.  Carolyn said "look just below the memory chips near the
front of the board are some jumpers."  They look like this:

            +---------------------------+
            |    +    +    +    +    +  |   From left to right notice
            |    |    //   //   //   |  |   that jumpers 2, 3 and 4 are
            |\   +    +    +    +    +  |   jumpered already.
            +---------------------------+ 
             ^
             |          This is the default configuration
          little        What you want to do is to move the
          yellow        jumpers from pins 3 and 4 and put 
         triangle       one on pin 5.  Then put in the new
                        memory chips to get one Meg.

And once I did that you know where I put the extra jumper?  

You got in!  -=*J36*=-  !!!!   What a nice plan, works out so perfectly...

I don't know know what all the memory jumpers mean but I heard that
you should be able to set it up to kickstart off that board (but I
didn't hear that from Carolyn).  Actually, I'm supposed to say I
didn't hear any of this from Carolyn, but since it worked, might as
well spread the word.

Now I can run the EHB demo!!

BTW:  Is there anyone who got a developer 500 that the bottom hatch
would actually stay on?  I had to tape up ours, hope this isn't the
final caseing.  Now I need to get memory expansion for our 500s.
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Randy Spencer      P.O. Box 4542   Berkeley  CA  94704        (415)284-4740 
                         I N F I N I T Y                 BBS: (415)283-5469
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                         s o f t w a r e          spencer@mica.berkeley.edu
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