Recent content by Desperado

I replaced the ram sockets to be safe but it still gives the same problem...at every start, I have a different amount of ram on the screen :( I suspect that SuperPLA is bad

there were a 4464-12 and a 41464-10...I replaced them with 41464-10

Must i check /CAS, /RAS and /WE signal for each dram?

Dave the manual you attached is for the 64GS console...

I read that the 64G has the Super PLA that manages the RAM... is it possible that it got damaged?

Good morning everyone, I have a Commodore 64G that seems to have RAM issues. This board uses two 41464 RAM chips, and it often starts up showing a lower amount of RAM on screen. I've tried replacing the RAM with new ones, and sometimes it improves, but other times it doesn't. Also, games load...

Solved! I changed also the Chars Rom and dow all is working ;) Thanks so much! Time to test the dual drive floppy now??

Update, now i removed all german labels from keys...i inserted the original basic 4 rom from zimmer and i moved some keys like business keyboard! Now almost everything matches except for a few keys that still generate German characters...

the checksum corresponds to what is indicated in the pet tester manual !

This is pettester screen

Can i insert romulator, it'isnt?

Can i remove the labels on the keys and insert standard basic 4 Roms?

as i said, the keyboard works but many keys do not match...and some keys They have symbols labeled above the keys :(

Do I have to press all the characters and tell you what appears on the screen?

Yes is working