[rkauer]

Stolen from Amiga Hardware Database:

the design of Merlin was not finished when the card went into production, leading to many problems:

* compatibility problems with other Zorro cards
* incompatibility with 060 processors
* incompatibility with all GVP processor cards
* reset problems
* the small registers of the ET4000 chip led to problems with 24 bit screens larger than 680×576 (8 and bit screens have no problems)

Stolen from Merlin's FAQ:

6. The 060-update (-fix) ?
For Zorro II computers with 060-cpu or GVP 040/030 Turboboards.
If you have made the hardwareupdate from prodev - not that fake from
xpert - you realy only need the new IC25 for 25 DM + postage + bankcosts.
This IC works only together with the hardwareupdate. It is included in the
hardwareupdate since april 1996 (when 060 were sold), and solves all problems
of the merlin with that kind of CPU.

7. Can I do the update?
You can do the hardwareupdate by your own. There are three IC in sockets
to be changed, and two wires to be soldered. A discription is included. It is
realy not difficult, if you can solder these wires. Nearly 80% of the updates
were done that way. But if you want, you can send the merlin to me (for
the same price), and I do the update for you, but then you have double of
postage to be payed.

8. How can I see if the update is already done?
There should be two short wires on the solderside:
IC24 pin 21 to ic22 pin 7
IC21 pin 10 to IC23 pin 19
And three ICs (IC24,21,25) are replaced with new ones, which mostly have
the numbers written on it by hand.

9. How can I see if the 060 update is done?
On IC25 should be written: "25-2"
If there is only "25" or nothing then the 060-fix isn't done
The 060-Fix is included in the normal update since april 1996.

10. 060-fix without normal hardwareupdate?
No. the normal update must have been done before.
The 060-Fix is included in the normal update since april 1996.

11. Is a fan neccessary?
Mostly not. But you should test by your own. May be you can run higher
frequencies then.