Probably a good idea to use a pull up resistor (a couple of K will do) rather 
than switching up directly to 5 V

      From: Alain HAOUI <>
 Sent: Friday, 19 May 2017, 17:20
 Subject: [Ql-Users] Split big ROMs on Q40
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 :
<> &p=17547#p17547



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