Super turbo PCB layout

I think an advantage for the QFP over SOP is that (as far as I can determine) QFP model is still produced.

Did a quick test with the QFP version and the pinout of a DIP40 socket.
It's going to be very very very tight...

If you look at the below image of the PCB design software, its already giving collision warnings (red circles).
Not sure how much extra room there is to play with with the QFP layout, but I know that the actual chip will have slightly shorter pins then the space on the PCB.
So maybe I will simply adjust the PCB space just a little.

Also the PCB could be a little wider than the pins for the DIP40, right? If needed of course…

I just think we are making it way to hard. A pcb on top of a Z80 is just fine.

Already solved the problem by trimming a little of the QFP package traces.

By the way, the adapter PCB on that page has the Z80 pins for mounting only on the bottom, not though-hole. You can see that the QFP pins will otherwise short circuit with them. Using only pins on the bottom and not trough-hole could tare off one of the pins when you try to remove the PCB from the Z80 socket. Not a good way of designing a PCB...

Will still be a challange though, because of the many traces from the Z80 on one side, the GAL and other components will mostly be mounted to the bottom.

About the schematic:
Where does pin 3 of the GAL go to... because I have no idea what is meant with IOB6...

About the Gal:
Is the SOIC version of the GAL still available...?
Would prefer not to use the PLCC version because of it's height.
Or is the Microchip ATF16V8 the same, because that one is available both as SOIC and TSSOP version...