Hi all, In the CMD RAMLink manual (4th Edition, First printing, February 1993): http://personalpages.tds.net/~rcarlsen/cbm/misc/rl/CMD_RamLink_Users_Manual_4th_Edition_1st_Printing_1993_Feb.pdf There's a warning on page 23 about data loss when using the RAMLink with a C64 and a heavy duty power supply. It specifically calls out Commodore's own 1764 supply (in the USA, this supply is like the C128 one but with a C64 plug): "Note: RAMLink was designed to be used on 64 computers with an original Commodore supply. If you have a 64 equipped with a heavy-duty power supply (as was issued with the 1764 REU) or some other after-market power supply, you may experience data loss problems with the RAMLink. Since RAMLink provides the power for an REU plugged into the RAM Port, use your original 64 power supply when possible. To help cut down on the possibility of data loss when using other power supplies, use the recommended power-up and power-down sequences with the heavy-duty and other non-original power supply types." It's understandable that CMD would recommend against using random third party supplies. However, I think it's interesting that CMD specifically warned against Commodore's own 1764 supply. My guess is that it has something to do with the residual output of the supply after AC power is lost. I'm assuming the RAMLink has a circuit to detect power loss and disable writes to the RAM, so the RAM can't be corrupted as the power goes down. If the 1764 supply outputs more residual power than the original C64 supply after AC power is lost, CMD may have been concerned that their RAM-write cut-off may not function as intended. That is, however, just my guess. What are your thoughts on this warning and why it may exist? Thanks, Mike -- Mike Naberezny (mike_at_naberezny.com) http://6502.orgReceived on 2021-07-28 22:00:03
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