Re: 840 av

[Mark Benson]

On Saturday, Mar 1, 2003, at 19:51 Europe/London, the pickle wrote:

> Then something is wrong with them *in that machine*.
>
> Like Mark said, that happens on occasion.  The 840AV is probably the 
> pickiest
> Mac ever made when it comes to RAM and VRAM speeds, and a chip that's 
> only
> marginally out of spec might work fine in every other 68K but fail in 
> the 840AV.

I have also had trouble with VRAM in Power Macs seating badly, as well 
as in odd LCs. Maybe, as the speckles say in one place while u move the 
RAM, you have a flakey VRAM socket or dirty contacts in one of the 
socket beds.

> What you're describing is *exactly* the problem that happens when VRAM 
> is too
> slow for a system; a 575 will demonstrate *identical* symptoms with 80 
> ns VRAM
> (at least, most of the time) when the bus is clocked past about 40 MHz.
> Stepping up to 70 ns VRAM solves the problem.  Some 80 ns VRAM modules 
> work
> just fine, however, which proves that VRAM spec'd at a single speed 
> clearly
> isn't 100% consistent in its performance.  Some 80 ns VRAM is, to put 
> it
> bluntly, faster than other 80 ns VRAM.

But the VRAM is 70ns, it says so in the chips. I don't think that is 
the problem here. It's either it doesn't like 512k VRAM or the VRAM is 
not seating well. VRAM in Macs is so fickle, I have solved corruption 
problem in a 7500 by taking the VRAM out, juggling it and putting it 
back in a different order. It's a crazy science!

> It sounds like you just need to find some different VRAM modules and 
> put those
> to use somewhere that isn't so timing-sensitive.

Like LCs :).

-- 
Mark Benson

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"Never send a human to do a machine's job."
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Re: 840 av

[victoria]

On 3/1/03 7:51 PM, "the pickle" <[EMAIL PROTECTED]> wrote:

> At 19:18 + on 01/03/03, victoria wrote:
> 
>> I have arranged them in every order I can and the speckels stay the same.
> 
> Then something is wrong with them *in that machine*.
> 
> Like Mark said, that happens on occasion.  The 840AV is probably the pickiest
> Mac ever made when it comes to RAM and VRAM speeds, and a chip that's only
> marginally out of spec might work fine in every other 68K but fail in the
> 840AV.
> 
> What you're describing is *exactly* the problem that happens when VRAM is too
> slow for a system; a 575 will demonstrate *identical* symptoms with 80 ns VRAM
> (at least, most of the time) when the bus is clocked past about 40 MHz.
> Stepping up to 70 ns VRAM solves the problem.  Some 80 ns VRAM modules work
> just fine, however, which proves that VRAM spec'd at a single speed clearly
> isn't 100% consistent in its performance.  Some 80 ns VRAM is, to put it
> bluntly, faster than other 80 ns VRAM.
> 
> It sounds like you just need to find some different VRAM modules and put those
> to use somewhere that isn't so timing-sensitive.

Hi

Ok then anyone UK based want a set of 4 matching 512k vram sims for a set of
4 256k vram sims.

Also Pick could this explain why my 840 has slowed down to a crawl. I get no
errors on the Mac and it is stable as a rock but thing's are taking twice as
long as they were just last week.

Vicki 


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Re: 840 av

[the pickle]

At 19:18 + on 01/03/03, victoria wrote:

>I have arranged them in every order I can and the speckels stay the same.

Then something is wrong with them *in that machine*.

Like Mark said, that happens on occasion.  The 840AV is probably the pickiest
Mac ever made when it comes to RAM and VRAM speeds, and a chip that's only
marginally out of spec might work fine in every other 68K but fail in the 840AV.

What you're describing is *exactly* the problem that happens when VRAM is too
slow for a system; a 575 will demonstrate *identical* symptoms with 80 ns VRAM
(at least, most of the time) when the bus is clocked past about 40 MHz.
Stepping up to 70 ns VRAM solves the problem.  Some 80 ns VRAM modules work
just fine, however, which proves that VRAM spec'd at a single speed clearly
isn't 100% consistent in its performance.  Some 80 ns VRAM is, to put it
bluntly, faster than other 80 ns VRAM.

It sounds like you just need to find some different VRAM modules and put those
to use somewhere that isn't so timing-sensitive.
-- 

the pickle

FAQ 
_

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Re: Auto On/Off Control Panel

[PeterH5322]

In a message dated 3/1/03 10:32:06 AM, [EMAIL PROTECTED] writes:

<<
>I want to replace the native 'Apple' (Matshita?) CDROM in a Quadra 630 and I
>remember reading here recently that the width of the replacement drive shld
>match the original 'Apple' unit as closely as possible, as there is very
>little room to spare in the bay.

CD-ROMs are pretty much standard.  I've never seen one that was "too wide" ...
>>

The overall form factor of CD-ROM drives are the same. Some DVD drives push 
the depth limit, however.

There are three different locations of the "manual eject" hole on CD-ROM 
drives. This varies by manufacturer, and sometimes within manufacturer.

To this end, Apple has three different CD-ROM bezels for some machine models, 
the only difference being where the hole in the front surface of the bezel is 
located.


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Re: 840 av

[victoria]

> 
> or -8 or a number 80 or 8. *Generally Speaking* 512k VRAM SIMMs
> have 4 large chips on, and 256ks only have 2 on one side. This is not
> an absolute but it's what I generally find in my large crop of
> variously upgraded LCs.
Hi 

I have arranged them in every order I can and the speckels stay the same.

As for the chips. The exact writing/number on the chips is
OKIJAPAN 
M548262-70 
4432202 

ON THE OTHER SIDE IT HAS 1994 MADE IN USA CUBIG INC VM 512K

These were working fine up until the other day and they only have 2 x chips
on one side.

Victoria.


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Re: Auto On/Off Control Panel

[the pickle]

At 18:28 + on 01/03/03, Mike Evans wrote:

>I want to replace the native 'Apple' (Matshita?) CDROM in a Quadra 630 and I
>remember reading here recently that the width of the replacement drive shld
>match the original 'Apple' unit as closely as possible, as there is very
>little room to spare in the bay.

CD-ROMs are pretty much standard.  I've never seen one that was "too wide"...
-- 

the pickle

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replace cdrom in quadra 630

[Mike Evans]

sorry, shld have included the above new subject line for my previous mail

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Re: Auto On/Off Control Panel

[Mike Evans]

I want to replace the native 'Apple' (Matshita?) CDROM in a Quadra 630 and I
remember reading here recently that the width of the replacement drive shld
match the original 'Apple' unit as closely as possible, as there is very
little room to spare in the bay.

I'd be very grateful if anyone tell me the dimensions of the original Apple
unit, I dont have the Quadra to hand, it is 6 hrs drive away at my folks'...
and I want to make sure of what is needed before I hit eBay.

mike


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Re: 840 av

[Mark Benson]

On Saturday, Mar 1, 2003, at 10:01 Europe/London, Powermac wrote:

> I just added 4x256k vram to my 840av and it works fine. Must be 80ns 
> vram to
> work, alot of the older quadra's can use 100ns ram but not the 840. I 
> think
> what your seeing is a marginal vram stick and video corruption i the 
> area
> where data is held on that stick. Try rearanging the sticks in the 4 
> slots
> and see if the image corruption changes to another area.

I have had this problem with VRAM in PCI PowerMAcs. I had a 7500 and a 
7300 and the  VRAM worked in the 7500 and not the 7300 (both in OS X 
10.1.5). It seems to be a weirdosity that some Apple machines have. It 
may be that there is a bad VRAM chip in there but it only manifests 
itself on an 840av due to the speeds and stresses the 840av puts thru 
the video system.

> 4x512k wont work in the 840. Some machines like the Q950 will take the 
> 512k
> vram but only use 256k of each stick.

512k SIMMs are usually recognised as 256k on an 840av. I think there 
are 1 or two 512ks that don't work properly.

> do you see a -80 on the chips?

or -8 or a number 80 or 8. *Generally Speaking* 512k VRAM SIMMs 
have 4 large chips on, and 256ks only have 2 on one side. This is not 
an absolute but it's what I generally find in my large crop of 
variously upgraded LCs.

-- 
Mark Benson

AIM - SilValleyPirate
Visit FlatPackMacs online: 
Visit my Homepage: 
Vintage Macs List Nanny

"Never send a human to do a machine's job."
-The Matrix


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Re: 840 av

[Powermac]

I just added 4x256k vram to my 840av and it works fine. Must be 80ns vram to
work, alot of the older quadra's can use 100ns ram but not the 840. I think
what your seeing is a marginal vram stick and video corruption i the area
where data is held on that stick. Try rearanging the sticks in the 4 slots
and see if the image corruption changes to another area.

4x512k wont work in the 840. Some machines like the Q950 will take the 512k
vram but only use 256k of each stick.

do you see a -80 on the chips?


- Original Message -
From: "victoria" <[EMAIL PROTECTED]>
To: "Quadlist" <[EMAIL PROTECTED]>
Sent: Saturday, March 01, 2003 2:46 AM
Subject: Re: 840 av


> On 2/28/03 11:29 PM, "the pickle" <[EMAIL PROTECTED]> wrote:
>
> > At 21:53 + on 28/02/03, victoria wrote:
> >
> >> When I set my monitor to millions of colour's no matter what res it is
on I
> >> get a speckeled part on the screen about a quarter of the screen size.
> >
> > You have bad VRAM, or VRAM that's too slow for that board.
>
>
> Hi Pick thanks for that but like I said I have tested the vram in other
macs
> and it works fine.
>
> The sticks I have are 4 x 512k vram chips and also 4 x 256k vram chips all
> work fine in my other macs.
>
> vicki
>
>
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>



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