Mirkosoft please read my post Bitte melde dich an, um diesen Link zu sehen.. Wrong cluster size resulted in my C65 rom (911101) dropping to monitor only.
Beiträge von deft im Thema „Monted 00 Partitions“
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Suddenly having problems with a 1GB sdcard again I just noticed a lot of bad stuff might or even will happen if you set the cluster size to default (4096 bytes) ! The C65 ROM kept dropping into debugger or not booting at all. Setting the cluster size to 512 bytes when formatting the card in Windows (fat32 of course) fixed the problem! I will try that fix for cards we thought to be incompatible (like 8GB and up) and report back.
best
Deft -
The really important thing is that the partition table MUST be DOS-style FDISK (4 partition slots only), not EFS or one of the other newer disk layouts that allow more than 4 partitions. Please let us know if you succeed and someone please write a text tutorial

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Hi,
the ROM checksum always is bad. 910111 is the one to go with, however other versions should boot aswell. For the charset, get a c64 one from zimmers.net and rename it. Try without a bootdisk at first, you can still mount it later. Please also make sure all switches on the board are set to OFF position. As you noticed, our SD implementation is not super clean yet so if you fiddle around, reformat (fat32) the card from time to time. Put the bitstream on it first, then the ROM, then the charset if you have one, then the bootlogo if you have one. Hope that helps - good luck and let me know!
best
Deft