Got this idea from Ben Weaver’s website after he had already hacked up a QS6. You can read about all the motivations behind this fix there:
The mention on the website was that someone tried on a QSR and it did not work. Well, I proved the opposite. It works quite well, although my implementation puts the address switches on the back of the unit. Micro switches on the front would probably work better, but I digress. Onward.
![](https://haxorhax.com/wp-content/uploads/2022/10/pcmcia-pins.png)
Starting from the pinout of a PCMCIA card, we’ll need A23 (16MB) and A24 (32MB) for larger card support.
![](https://haxorhax.com/wp-content/uploads/2022/10/pcmcia-qs6.png)
QSR schematic not available, but used QS6 as reference. A23 (Pin 122) and A24 (Pin 123) need to be cut.
![](https://haxorhax.com/wp-content/uploads/2022/10/qsr-overview-1024x576.jpg)
Zoomed out to show the A23 switch addition – purple wire.
![](https://haxorhax.com/wp-content/uploads/2022/11/qsr-single-1024x576.jpg)
Close up of connections. A23 only at this point. Note the cut traces for both A23 and A24.
![](https://haxorhax.com/wp-content/uploads/2022/10/qsr-single-anno.jpg)
PCMCIA numbering is odd – numbers counted in zigzag. Bottom card (1-68) and top card (69-136). Shown for reference.
![](https://haxorhax.com/wp-content/uploads/2022/11/qsr-double.jpg)
Added second switch for A24, and reusing power and ground for that switch as well.
![](https://haxorhax.com/wp-content/uploads/2022/10/qsr-switched-1024x576.jpg)
Drilled holes in back where there was room for switches.
Now once you get everything modded, you need to get a card programmed with the data. That I will leave for another post!