Hallo Andrew, Pasi, > > is a short between D4 and another data line (or ground). > [..] > > Eh, eh, eh eh, bit 3.... :-) > > D3, bit 4, whatever :-) > > Just a thing that occurred to me is that it could be > possible that the cartridge port has just accumulated > some bad habits like getting some sticky stuff or > oxidised.. Cleaning the REU contacts and inserting/removing > it a couple of times might do the trick, if it's not > the DRAM that has gone bad.. > > -Pasi > -- > "You forgot the first rule of a fanatic. When you become obsessed > with the enemy, you *become* the enemy." > -- Sinclair to 'Tular' in Babylon 5:"Infection" The thought rised that it cannot be the REU itself. If D3 of the port was bad, the C64/128 would strike as well. You must check the read/write registers by reading the value you just wrote to them. If bit 3 is faulty, the main IC is damaged meaning you can say goodbye to your REU. But I doubt that because it does swap/read/load memory. So my personal main suspect is a bad RAM-IC. This is a 41256 or equivalent. If you cannot get it, I'll send you one. Groetjes, Ruud
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