ATARI XL/XE SIO2SD Iterface PCB V 2.0

Design by: 6485

Device features: Supported cards: vers. <=2.5 : MMC/SDSC vers. >=3.0 : MMC/SDSC/SDHC (and very likely with SDXC, but only FAT32 formated) Supported partitioning schemas: vers. <=2.5 : no partition, MBR (Master Boot Record) vers. >=3.0 : no partition, MBR (Master Boot Record), GPT (GUID Partition Table - EFI) Supported formats: vers. <=2.0 : FAT16 and FAT32 (FAT12 support was buggy) vers. >=2.1 : FAT12,FAT16 and FAT32 Handles ATR (rw), XFD (ro) and COM/XEX (ro) file types 16x2 LCD display allows to "walk" catalog tree and choose files to load (40x2 LCD displays are also supported) TURBO: vers. <=1.3 : constant speed index 10 (51kb/s) vers. 2.0 - 2.5 : speed index can be set by user from 0 to 16, default is 6 (69kb/s) vers. >=3.0 : additional turbo mode. I've called it 7-bit mode (7th bit of command switches turbo). This is new turbo mode very similar to XF551 turbo mode. All densities with 128B and 256B sectors, including 16MB disks Number of simulated drives: vers. <=1.2 : 4 vers. 1.3 - 2.5 : 8 vers. >=3.0 : 15 + 100 Configuration program: vers. <=2.5 : built-in (can be loaded directly from AVR MCU with no SD card present in slot, but program has to be very simple due to memory size) vers. >=3.0 : has to be present on SD card, but any program can be used vers. >=3.0 : New ATR files and new folders can be created using SIO commands vers. >=3.0 : "Empty disk" mode (ATR file created automatically during format command) vers. >=3.0 : Deleting files from card using SIO commands vers. >=3.0 : Renaming files and folders using SIO commands vers. >=3.0 : Reading and writting all files using SIO commands (inside ATARI folder and subfolders) vers. >=3.0 : 100 extra "virtual drives" V0..V99, which can be mapped to any drive from D1 to D15 vers. >=3.0 : Fast mapping - Drives V0 to V3 have additional, special meaning. When one of keys from K1 to K4 is pressed during start then device overrides mapping of D1 and maps one of those drives to D1 (K1 = V0, K2 = V1 etc.). vers. >=3.0 : Builtin very simple TURBO loader (for 7th bit mode - turbo mode similar to one used in XF551)