+playsoft Posted September 21, 2013 Share Posted September 21, 2013 I have created a MegaCart image which runs ok in Altirra in 5200 mode, do I need to do something to let the Ultimate SD cart know it's MegaCart format? Edit: does it just need a CART header (now added)? Edit again: I think the issue is that MegaCart means something different in these two cases (Altirra and the 5200 SD cart). On Altirra/A800Win etc... Type 31: MegaCart 512 KB cartridge A bank-switched cartridge that occupies 16 KB of address space between $8000 and $BFFF. It is controlled by a byte written to $D500-$D5FF. Five lowest bits select one of 32 available banks, bit 7 disables the cartridge. But the SD cart says... MEGA-CART Bank-switched ROM images up to 512KB (M.U.L.E, etc) For this ROM to work on Altirra you need to select the 5200 64K Cartridge (32K banks) option. So they are different formats and I need to modify the code from 16K banks to 32K banks. 1 Quote Link to comment Share on other sites More sharing options...
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