For the <nth> time, I am talking about running the machine from a bench supply _without having a battery pack installed_. Rechargeable sells are too expensive for me to buy a set just to test a machine (and these sub-C tagged cells have to be soldered up into the right pack, you can't buy a few and move them between devices easily, unlike, say, AA cells). And I don't use the machine often enough that I would get anything like a reasonable life out of a pack of cells. Yes, I loose the memory and configuration when I turn the supply off. This is not a problem for me testing it. If I start using it seriously, I'll buy the cells. Now what does 6V, 600mA really mean? There are at least 3 reasonable explanations of those figures (and a lot more unreasonable ones) : 1) The open-circuit voltage is 6V, the short-circuit current is 600mA 2) The open-circuit voltage is 6V, the rated output current is 600mA 3) One point on the I,V curve, hopefully near the point where the adapter will be used, is 600mA, 6V. Now, I wonder what the actuall I,V curve of that adapter is. And I wonder how critical it is (knowing that HP chargers were designed to have poor regulation, and the charger circuit depended on this. Yes, I have measured the I,V curves of many HP calculator chargers). I have seen the (your?) web page which gives a hand-drawn schematic of the Epson adapter. IIRC it's a 2-diode 'biphase' full wave rectifier. I assume this was the one built into a case with a European mains plug. With my PX8/PF10 I got a wall wart, which may be something to do with it, it may not (some other items included in that lot on E-bay had nothing to do with the machine, but were useful to me anyway). It's in a case with a UK 13A (BS1363) plug on it. It has a bridge-type full-wave rectifer. Of course it's very possible that different designs were used in different counttries. I have not put the mains on it yet. But it would be useful to know what the 'correct' adapter's I,V curve is before risking my machine (I can easily measuer the curve for this one). Incidentally, do you know if the PX4, PX8, PF10 and HX20 all use the same adapter? -tony