How do 3.1 roms fit on the A3000D?

[Amiduffer]

Hey guys, my A3000D 3.1Roms just arrived! But, the instructions are missing an important part. It said to note the orientation of the current chips. But the 2.04 roms are quite different from 3.1 roms.

The 3.1 chips have a notch on one side and the 2.04 roms have a small dimple in the lower left corner.

If I install the 3.1Rom with the notch to match the marking on the motherboard, that would put the label upsidedown, that's ok, right?

The motherboard is a REV 9, so there's no adaptor board.

Any current A3000D users with 3.1 roms? Help me out, I don't want to fry these chips!! :-o

[melott]

If I understand you correctly ....
You have no rom tower, so you should install the
new 3.1 chips orented the same was the 2.04 chips
were. The stick-on label doesn't really mean anything.
You are correct that the notch and dimple indicate the
front (pin one) position so install them the same as the
old chips and pay attention to the chip numbers.
If you put chip one in the chip two position it just
won't boot, I'm not sure what would happen if you turned
the chips 180 degrees and installed them.

[Amiduffer]

melott wrote:

You are correct that the notch and dimple indicate the
front (pin one) position so install them the same as the
old chips and pay attention to the chip numbers.
If you put chip one in the chip two position it just
won't boot, I'm not sure what would happen if you turned
the chips 180 degrees and installed them.

Ok, good. What I don't get, though, is why does chip 1 go in the Rom 0 slot? And chip 0 go in the Rom 1 slot? :crazy:

[Zac67]

melott's correct.

The complete ROM is split into one ROM chip with the odd and one with even address bytes in all 32 bit Amigas. If you accidentally exchange both ROM chips nothing bad will happen, except the system will not boot, since the ROM is completely garbled and doesn't make sense.
However, if you reverse the chips, i.e. orientate the notch to the wrong side of the socket, you will instantly fry the ROM chips and will have to get new ones.
Printed silks are wrong on some models, so do note orientation before you remove the old ROM chips - this must be the correct way to put them in if Amy was working.

[DaBest]

I as just about to say all that.  :lol:
I just did my A3000D with the 3.1 ROMS :-D  :-D

[Doobrey]

Zac67 wrote:
The complete ROM is split into one ROM chip with the odd and one with even address bytes in all 32 bit Amigas.

Just being pedantic, but the ROMs are split with odd and even words(16 bit), not bytes. D0-D15 goes to one chip, D16-D31 to the other.

[Amiduffer]

[color=ffa500]Alll right!!![/color][/b][/i]

Another happy ending. My old A3000 is the happy recipient of the 3.5 operating system! Thanks all! Your advice was most helpfull. Putting the Zip chips in was easy at least.

At first, I put the two chips in the wrong slots just like you said you did, and got the blank screen, then I noticed that the slot numbers are labeled on the chips, DUH! But by switching them, WHAMO!! the screen comes up and off I go!! MY, installing by CDrom is way better than by floppy.

But, now that I've been able to install ImageFX4.5, it crashes right off the bat when I load it up. :-? Oh well, it's almost a happy ending :-D

[Zac67]

@Doobrey: of course it's words, sorry 'bout that :crazy: