platform-coco2cart
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COCO2 ===== COCO or Dragon 64 with an IDE port, cartridge and 64K of RAM Supported hardware: IDE (Cloud9 or compatible set at FF50) with either built in cartridge RAM or separate cartridge COCO SDC Disk Layout =========== Standard disk partitions are not handled due to limited memory. Instead each minor number corresponds to a 32MB slice of disc. Slice 0 holds the kernel image and the rest is used for swapping processes. Slice 1 then normally holds the first file system and so on. Add 128 for the second disc. Remember to keep all of them under the offset you have set in the HDBDOS ROM for your disk basic floppy images. Memory Map ========== User View ========= 0000-00FF Interrupt stack 0100-01FF Vectors plus the swap stack 0200-19FF Display 1A00-1BFF udata/stack 1C00-7FFF Common, data and some kernel code 8000-FDFF User space FE00-FEFF Free FF00-FFFF I/O etc Kernel Mode View ================ 0000-00FF Interrupt stack 0100-01FF Vectors plus swap stack 0200-19FF Display 1A00-1BFF udata/stack 1C00-7FFF Common, data and some kernel code 8000-BFFF ROM C000-FEFF Kernel FF00-FFFF I/O etc Emulating in XRoar ================== Needs the IDE patches, no support for COCOSDC emulation in xroar as of 0.33.2 TODO ==== Make the boot loader robust (timeout handling) Add hash of code not just simple magic - so we know bits match Support for a real time clock and clock locking We should be totally clean now on FIR blocking, so audio might actually be doable if not doing drivewire. See if given an extra loader a 64K machine with Tormod's 32K RAM cart would work. To Test ======= Build the image and you'll get a fuzix.ide and fuzix.rom In the xroar directory where you have a hard disc image do dd if=platform/fuzix.ide of=hd0.img bs=512 seek=3 conv=notrunc /opt/xroaride/bin/xroar -default-machine dragon64 -cart ide -cart-rom platform/fuzix.rom exec 49152 A 32MB filesystem can be put in slice 1 using dd with an offset of 32MB + 2 sectors. For the CocoSDC the same procedure applies (without an emulator however) but using the fuzixsdc rom and SD image. enjoy