electronzen
New Member
I made up a little PCB for a rom card that interfaces to a Z80 based SBC.
The problem is, I made a mistake laying out the PCB and didn't connect the ground trace to the flash rom part (AM29F040), its just floating.
The other problem is, the device works _perfectly_.![Eek! :eek: :eek:](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I'm not an engineer and don't have any formal training in electronics, so its completely puzzling to me why this device should work at all like this.
I tried replacing the AM29f040 with a few parts from other flash makers and they all work too, all with the ground pin floating.
Why does it still work?
Alan
The problem is, I made a mistake laying out the PCB and didn't connect the ground trace to the flash rom part (AM29F040), its just floating.
The other problem is, the device works _perfectly_.
I'm not an engineer and don't have any formal training in electronics, so its completely puzzling to me why this device should work at all like this.
I tried replacing the AM29f040 with a few parts from other flash makers and they all work too, all with the ground pin floating.
Why does it still work?
Alan