LCIII Startup Chimes

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2 total messages Started by Andrew Watts Tue, 24 Feb 1998 00:00

#1609

Author: Andrew Watts
Date: Tue, 24 Feb 1998 00:00

17 lines
1110 bytes

We have just added a 16MB Ram chip to an LCIII.  On reboot the LC does its
usual 'dong' note, and then proceeds to do 4 chimes going up in scale,
followed by four notes going down in scale.  The screen remains black and
the mac does not go any further.

Removing the chip and putting back the 8MB chip that was there enables the
mac to start up ok.  This is the second 16MB chip we have tried so I do not
think it is a faulty chip.

The label on the chip says 16MB SIMM 72pin, 70NS, which I think should work.

Anyone got any ideas?

Thanks in advance

Andy

Re: LCIII Startup Chimes

#1610

Author: Rebecca and Rowland
Date: Tue, 24 Feb 1998 00:00

42 lines
2579 bytes

Andrew Watts <Andrew.Watts@tba.gov.uk> wrote:

> We have just added a 16MB Ram chip to an LCIII.  On reboot the LC does its
> usual 'dong' note, and then proceeds to do 4 chimes going up in scale,
> followed by four notes going down in scale.  The screen remains black and
> the mac does not go any further.
> 
> Removing the chip and putting back the 8MB chip that was there enables the
> mac to start up ok.  This is the second 16MB chip we have tried so I do not
> think it is a faulty chip.

I'm going to pick nits again - you've got a single-in-line memory module
(SIMM) which is (most likely) made up of 8 dynamic RAM integrated
circuits (IC or chip for short).  It might have 9 chips - the extra one
hold the parity bit for each byte of memory (redundant on virtually all
Macs).  If it's got more than 9 chips, it's best to avoid it (that'd
make it a composite SIMM, which Apple has a bit of a downer on).

> The label on the chip says 16MB SIMM 72pin, 70NS, which I think should work.
> 
> Anyone got any ideas?

Well, some months ago I bought a 16MB SIMM - 72 pin, 70ns, 5V, for my
Performa 475 (very similar beastie to an LCIII).  It didn't work - same
symptoms as you describe.  I took it back to the shop, and they asked me
`Is it going in a 486 or Pentium motherboard'.  After the stunned
silence when I said `neither' - `What, you've got a 386?' `No, a 68040'
(etc), they explained they'd had a lot of trouble with that particular
SIMM which worked fine in Pentium boards but not in a lot of 486 boards
- they tested the SIMM in a Pentium PC while I was there, and it worked
perfectly; and then in a 486 PC which didn't like it at all.  They could
offer no explanation of *why* this happened, but replaced my SIMM with a
different one that they said ought to work, and it did.

Rowland.

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