With Peter Graf's indications and some AM27C4096 ships supplied by Derek
Stewart, I realized a little circuit permitting to have a global ROM size of
1 MegaBytes on Q40 with 2 big OSes (custom SMSQ/E) ROMed together (up to
512KB each) and selectable from a case switch.

 

You can find schematic and some details from forum :

http://qlforum.co.uk/viewtopic.php?f=20
<http://qlforum.co.uk/viewtopic.php?f=20&p=17547#p17547> &p=17547#p17547

 

Alain

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