My 1D4 had the resistor you speak of, but did have the E123 and E125 removed (actually, looks as though it never had them in the first place). The scandoubler worked fine, but I had problems using a PC mouse adaptor (see my thread entitled "Mobo swap, RMB dead"). I never solved the problem and had to revert to a 2B (different to the first, and with another hack on the D215 chip near the TV modulator which doesn't exist on the 1D4, but not the timing hacks). My system is now back to "normal".