Amiga ROM 3.1 Upgrade

Amiga Kickstart 3.1 ROM chip upgrade

I decided to order 3.1 ROM chips few weeks ago.

After having downloaded the ROMs not-so-legally for the past 15 years — seeing the actual chips felt kinda good.

3.1 Twin Chips

My A1200 originally came with 3.0 (39.106). I’m not really sure about the in depth details between 3.0 and 3.1.

Here is the list of differences between modules contained in Kickstarts:

bootmenu                39.19    40.5
card.resource           37.11    40.4
carddisk.device         37.11    40.1
con-handler             39.8     40.2
console.device          39.28    40.2
dos.library             39.23    40.3
exec                    39.47    40.10
expansion               39.7     40.2
filesystem.resource     39.2     40.1
filesystem              39.27    40.1
gadtools.library        39.356   40.4
graphics.library        39.89    40.24 (AGA)
icon.library            39.3     40.1
input                   37.12    40.1
intuition.library       39.2084  40.85
keymap.library          37.2     40.4
layers.library          39.61    40.1
mathffp.library         39.1     40.1
mathieeesingbas.library 37.3     40.4
ramlib                  39.5     40.2
romboot                 39.27    40.1
scsi.device             37.64    40.12
shell                   39.13    40.2
trackdisk.device        39.4     40.1
utility.library         39.10    40.1
workbench.library       39.1     40.5

The official Commodore release notes are probably already lost in time.

The 3.1 contains bunch of bug-fixes, better support for WB 3.9 and the modern 4.X AmigaOS versions.

Kickstart 3.0 doesn’t support Amiga OS’s later than 3.1.

Amiga 3.0 ROM Boot Details

The last (official?) ROM 3.0 version  was 39.115. Check the Cloanto’s listing of all the different Amiga ROM versions and revisions.

The installation is really simple, just locate the ROMs on the motherboard.

3.0 ROM Chips

The ROM chips on my motherboard were a bit difficult to remove due to dirt and grime accrued into the sockets. If you have access to a tool specifically design to removing chips from sockets, use it.

Otherwise, just take your time to ease the chips out without using excessive force.

When socketing the replacement chips, make sure that all legs are aligned properly before pushing the chip into the socket. It takes surprisingly little force to push the chips in.

Interesting to see that the leftmost pins of the sockets are not populated. Maybe there is some folklore available about this design decisions?

New Chips Seated Nicely

Amiga boots just fine, but seems that it takes a bit longer than with the older 3.0 ROMs.

The 3.1 actually adds some start-up delay for checking available hard drives to get around some 3.0 related bug.

Amiga 3.1 Boot Details

Amiga 3.X ROMs are also available for purchase these days. I didn’t see the need to grab those — the changes are not really that relevant, and I wanted to maximise the compatibility with the old games and software.

Additionally I like to remain in the 90’s when it comes to Amiga platform 😉

Kickstart ROMs explained.

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