Can't upgrad rev 5 A500 to KS 3.1

[curtis]

So, I followed the directions at http://www.area536.com/projects/amiga/upgrade-amiga-500-kickstart-from-12-to-31/

Did so VERY carefully, counting pins several times to make sure I was on pin 31 and nothing happens.

All I get is a black screen.

ROM checks on in another machine, so I know that's not the problem.

Motherboard works with 1.3 and 2.05 (with the wire from 1 to 31).

Any suggestions?

[curtis]

1MB installed.

Do you have 1 meg chip or 512k? I think it needs 1Meg.

[curtis]

Totally NOT relevant.

Trying to install 3.1 NOT 3.5/3.9.

Hmm, Check requirements once more?

"System Requirements
AmigaOS 3.9's hardware requirements are identical to that of Amiga OS 3.5. AmigaOS 3.9 is a software-only Update w/o ROMs (however, it requires Kickstart 3.1 ROMs to operate!)

AmigaOS 3.9 is the update for Amiga OS 3.5 -- but it can also be installed directly on top of an Amiga OS 3.1 system.

Minimum Requirements:

    CD-ROM drive
    Hard drive
    68020 or higher processor
    Amiga 3.1 ROMs (version 40.xx)
    6 MB Fast RAM"

[curtis]

That's the same procedure I listed in the initial posting.  Only difference is this uses the wire from pin 1 directly to socket pin 31 instead of using an extra socket.  Difference doesn't make any difference electrically.

check this out , this should do the trick:

http://www.nyx.net/~rdavis/AmigaHints2.html#v31rom

"Jumper wires for the Amiga OS 3.1 ROMs, at least the ones I have seen, are different from
the jumpers on the 2.04 ROMs, and not well documented by the ROM suppliers.

Here is another look at OS 3.1 ROM jumper installation, specifically for a version 5 Amiga 500 motherboard.
Solder a thin wire to pin 1 of the ROM IC.  Leave the other end of this wire free.
Solder a thin wire from pin 21 of the ROM IC to pin 31 of the ROM IC.
Bend up pin 31 of the ROM IC so that pin will not go into the ROM socket.
Insert the ROM IC into the socket, taking care that pin 31 of the IC touches *no* other pin or wire.
Insert the free end of the wire from pin 1 into the socket at location 31, taking care that
the wire does not touch any pin on the IC or any other possible connection.
Check for bent pins, test the computer before re-assembling."

[curtis]

Not sure how mechy's version works as opposed to the original I tried.

Only difference would be putting the wire from 1 directly into the socket at pin 31 instead of using a shorting wire from 1 to 31 on an additional socket.

There shouldn't be that much additional noise generated from the addition of the extra socket.

I just tried this again myself as I too had a grumpy A500 rev 5 that would not take a KS3.1 ROM.  Mechy's advice is correct, there IS a difference on how the jumpers are done.  I tested the usual Pin 1-31 and 31 to 21 mod just now - did not work.  So, I then did the one Mechy described above and it works.

Also, on this machine, the Motorola 68000 would not work - ROM would start up and then guru.  Replacing the Motorola with an ST68000P8 clone and no problems.  Perhaps they have a lower tolerance with the bus noise.  The 68HC000s are also much more forgiving.

Anyway, try Mechy's instructions, they worked here just now.

[curtis]

Good info, but it doesn't address 3.1.

[curtis]

Beats the heck out of me!

It has a label SECURELY covering the entire top!

And, I did try a couple of different 3.1's with the same result.