Hint to use the NOVA graphics card with FX:

Because of a minor design flaw (no open collector exit of the
expand signal) of the NOVA-adaptercard, the NOVA won't work together
with FX under certain circumstances (e.g. higher temperatures):

After launch of FXDRIVE.PRG the machine crashes and you can see random
pixels on the screen. We strongly recommend not to work so, as even
with seemingly undisturbed operation, most heavy errors and data losses
are likely to happen.

To remove this problem the following patch of the NOVA adapter is necessary:

A Schottky-Diode BAT41 (or similar) has to be inserted into the expand
signal, which is marked in the following sketch:

U=Expand-connection on the lower side
O=Expand-connection on the upper side
V=Contact between upper and lower side
*=Connecting pin

--------------------------------------------------------------+
*  50pin-connector  * * * * * * * * * * * * * * * * * * * * * |
                                                              |
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |<-Pin 49
                                                            U |
                                                           U  |
                                                          U   |
                                  VUUUUUUUUUUUUUUUUUUUUUUU    |
                                 O              X             |
     ..OOOOOOOOOOOOOOOOOOOOOOOOOO                             |
                                                              |
                                                              |

Separate the connection on the lower side (U) at the position X.

Then solder the diode BAT41 with the anode at pin 49 and the
cathode (dark ring) at V.

Then it should look that way:

--------------------------------------------------------------+
*  50pin-connector  * * * * * * * * * * * * * * * * * * * * * |
                                                              |
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |<-Pin 49
                                   Cathode      Anode      /U |
                                  __________|/|___________/U  |
                                 |          |\|           U   |
                                 |VUUUUUUUUU     UUUUUUUUU    |
                                 O                            |
     ..OOOOOOOOOOOOOOOOOOOOOOOOOO                             |
                                                              |


