Hodgkinson wrote:
im wondering whether there is any detriment to feed power into the A1200 from both the normal PSU connector and the floppy header?
I wouldn't recommend it. Two separate power supplies going in to the same circuit is asking for trouble. Why not just cut the A1200 power connector off of your PSU and wire it on to the ATX PSU? I did this and it worked perfectly when connected to the A1200 standard power socket.
Hodgkinson wrote:
Even though I’ve now rewired all the additional devices to be powered directly from the ATX PSU, I've noticed that the voltage drop across the A1200 from the power connector to the floppy connector is fairly large considering the normal voltage operating range for TTL devices, and im wondering whether adding a second supply path might just help bring the voltage within the A1200 up a little.
An ATX PSU should be more than powerful enough by itself. There's no need to supplement the power with the A1200 PSU and risk damage to one or both of the PSUs. Also, I wouldn't recommend using the floppy connector for power. You lose the 3.3v supply, which results in certain parts of the board not functioning (sound, some ports etc).
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moto
