Amiga 3000 rom in wrong place

simon_m74 · 06 July 2018, 18:47

Hi
I have an Amiga 3000, that only boots once every few(lots of) times, and even less when I have expansion cards installed.

As the symptoms to me reminded me of LCD tv/monitors, that dont turn on every attempt - I assumed I need to change the capacitors.

Right - so I started to prep it just :
dissembled Amiga - and found a slight greening crust on the daughter board sockets.
So before I change the caps, I thought I`d give the board a clean - so in my usual procedure, I remove most of the socketed IC`s, to be sure I clean all the contacts on the sockets.

This is when I noticed that ROM 1 was in ROM 0 socket, and ROM 0 was in ROM 1 socket?

But without expansion cards - it still booted fine ?

SO my requests here are :

Where do I put the ROM chips back in ? 1 in 1, and 0 in 0, or 1 in 0 and 0 in 1 ?
If 1-0 and 0-1 - is this the norm? as I have many other Amiga 3000, that I`m trying to diagnose - and with roms in the `wrong place` - would that hinder my diagnosing?

Also - Would I be correct in assuming to change the caps on an Amiga that doesn't boot each time ?
Although was it just the green crust causing connection issues to the daughter board, as it did boot almost every time with no expansion cards.

Thanks

Simon (VR GUY)

Jope · 07 July 2018, 08:20

Keep the ROMs in the sockets you found them in, the machine will not boot at all if you swap them around.

simon_m74 · 07 July 2018, 10:55

Would I damage anything if I put them in the `correct` places?
Someone else I know says to put them in correctly.

But I did find this pic :
http://www.bigbookofamigahardware.co...a3000rev89.jpg

showing Roms in opposite places.

thomas · 07 July 2018, 13:05

Quote:

Originally Posted by simon_m74

Would I damage anything if I put them in the `correct` places?

No. One ROM chip holds the odd bytes, the other chip holds the even bytes. If you swap the ROM chips, every two bytes will be swapped and the ROM as a hole won't contain anything useful any more. Therefore nothing will happen, only a black screen, no boot, no blink, no click, no nothing.

It does not matter what is printed on the chips, what matters is the contents of each chip.

simon_m74 · 07 July 2018, 18:24

As I have a few Amiga 3000`s, that just have a black screen, and I suspected either ROM or CPU... I`ll try swapping them over!
Thanks

simon_m74 · 08 July 2018, 22:43

Hi All, I put Roms as I found them - system boots okish now

(will not boot with any expansion cards - I`ll start a new thread with this one)

Thanks all

06 July 2018, 18:47	#1
simon_m74 Registered User Join Date: Mar 2013 Location: UK Posts: 221	Amiga 3000 rom in wrong place Hi I have an Amiga 3000, that only boots once every few(lots of) times, and even less when I have expansion cards installed. As the symptoms to me reminded me of LCD tv/monitors, that dont turn on every attempt - I assumed I need to change the capacitors. Right - so I started to prep it just : dissembled Amiga - and found a slight greening crust on the daughter board sockets. So before I change the caps, I thought I`d give the board a clean - so in my usual procedure, I remove most of the socketed IC`s, to be sure I clean all the contacts on the sockets. This is when I noticed that ROM 1 was in ROM 0 socket, and ROM 0 was in ROM 1 socket? But without expansion cards - it still booted fine ? SO my requests here are : Where do I put the ROM chips back in ? 1 in 1, and 0 in 0, or 1 in 0 and 0 in 1 ? If 1-0 and 0-1 - is this the norm? as I have many other Amiga 3000, that I`m trying to diagnose - and with roms in the `wrong place` - would that hinder my diagnosing? Also - Would I be correct in assuming to change the caps on an Amiga that doesn't boot each time ? Although was it just the green crust causing connection issues to the daughter board, as it did boot almost every time with no expansion cards. Thanks Simon (VR GUY)

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07 July 2018, 08:20	#2
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	Keep the ROMs in the sockets you found them in, the machine will not boot at all if you swap them around.

07 July 2018, 10:55	#3
simon_m74 Registered User Join Date: Mar 2013 Location: UK Posts: 221	Would I damage anything if I put them in the `correct` places? Someone else I know says to put them in correctly. But I did find this pic : http://www.bigbookofamigahardware.co...a3000rev89.jpg showing Roms in opposite places.

07 July 2018, 18:24	#5
simon_m74 Registered User Join Date: Mar 2013 Location: UK Posts: 221	As I have a few Amiga 3000`s, that just have a black screen, and I suspected either ROM or CPU... I`ll try swapping them over! Thanks

08 July 2018, 22:43	#6
simon_m74 Registered User Join Date: Mar 2013 Location: UK Posts: 221	Hi All, I put Roms as I found them - system boots okish now (will not boot with any expansion cards - I`ll start a new thread with this one) Thanks all

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