MetaDOS 2.4 These are the essential elements to get any SCSI CD ROM drive going on an Atari TT. You may use it 'as is'. Don't expect any updates, because we are putting all our effort in a new driver which will work under MultiTOS. Before that driver is available you might spend some time with MetaDOS 2.4. This release fixes only some small problems present in previous versions. FILES \AUTO\CDARGEN.BOS Generalized version of physical device driver. This driver only supports SCSI CD ROMs connected to the SCSI port of the Atari TT (or the Atari 'CDAR 504' connected to the ACSI port of any Atari computer with ACSI port). \AUTO\HSMAY86.DOS Version 2.40 driver for CD-ROMs in High Sierra format (usually not needed). \AUTO\ISO9660F.DOS Version 2.40 driver for CD-ROMs in ISO 9660 format (the ISO format is the 'real' final version of the original High Sierra specification). \AUTO\METADOS.PRG Version 2.4 of MetaDOS. \AUTO\CONFIG.SYS Configuration file. You will have to edit this file to assign drive numbers and/or drive letters. In addition, you can edit the path names for all driver files (if \AUTO\BOOT\ isn't ok for you). INSTALLATION Copy METADOS.PRG, CONFIG.SYS, CDARGEN.BOS, ISO9660F.DOS and HSMAY86.DOS into the AUTO folder, edit the ASCII file CONFIG.SYS for your specific settings. Reboot. KNOWN PROBLEMS METADOS.PRG Some programs do not work properly when MetaDOS is installed (because they are violating the rules for register saving for GEMDOS calls). Contact the programmers of these programs to get them fixed. Some programs won't access drive letters beyond P: (MetaDOS can install drive letters up to Z:). Technical problems: (1) It's not possible to redirect GEMDOS standard input/output to MetaDOS files (only applies to people using command line shells). (2) Files on MetaDOS devices aren't closed when a program bombs or is aborted with CTRL-C (this is usually no problem with CD-ROMs, because they are read only media). ISO9660F.DOS and HSMAY86.DOS Sometimes, media change doesn't work properly. If this happens to you, eject the disk, insert it again and wait a few seconds before the next try. CDARGEN.BOS The old audio commands (documented in the developer's documentation) are only supported for backwards compatibility only; some flags do not work at all. Technical problems: the MetaDOS XBIOS calls that cause I/O with an ACSI device require that buffers are allocated in ST compatible RAM (see Mxalloc documentation). Some CD ROM drives need special initializations to be able to access disks in XA format (Photo CD). CDARGEN.BOS has no special support for those drives.