atrax27407 Posted August 30, 2016 Share Posted August 30, 2016 I recall seeing a modification to the Horizon RAMdisk to replace the rechargeable Ni-Cad batteries with a long-life Lithium cell. I think the mod required replacing the resistors in the charging circuit with diodes (and maybe some other mods as well). Has anyone tried this mod? Or, does anyone have the details about it? Quote Link to comment Share on other sites More sharing options...
RickyDean Posted August 30, 2016 Share Posted August 30, 2016 Let me delve into my files tonight I believe the great Gazoo had something about it here in the forums and I am working toward using NiMH batteries in mine as I progress toward getting them back into usefulness Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted August 30, 2016 Author Share Posted August 30, 2016 Ha! Found it. Now all I need is the polarity (orientation) for the diode. If you put a diode (in the correct polarity of course) on one of the ends of the battery connections, it will prevent the charging circuit from working. Then you can use alkaline or lithium batteries. I've found that they keep the card contents intact for three to five years, and you don't have to worry about turning on the computer to keep the batteries charged. If you want to get fancy, you can run 2 wires and take the batteries off-board and use some D cells in holders. You might get a few more years extra for taking that approach. Since I hardly ever change the contents of my Horizons, I'd like to replace the Sram chips with Eproms or EEproms. If I could find a way to dump the individual Srams on the board, I would already have this in place. Unfortunately I don't have the skill-set to do this. Maybe someone here does. Gazoo 2 Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted August 30, 2016 Author Share Posted August 30, 2016 Next question is: What value of diode would be appropriate? Quote Link to comment Share on other sites More sharing options...
RickyDean Posted August 30, 2016 Share Posted August 30, 2016 Next question is: What value of diode would be appropriate? I would think about a IN4007 would be sufficient,but someone may have a better idea. Quote Link to comment Share on other sites More sharing options...
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