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Stefan Ossowski's Schatztruhe and Ralph Babel, author of the well-known "Amiga Guru Book" and long-standing former system software developer for GVP, the American company known for its high-quality hardware products, present:

The Guru ROM for GVP's line of host adapters set new standards for SCSI on the Amiga; its high degree of compatibility with the widest range of SCSI devices is unprecedented; its performance goes to the limit of the underlying hardware.

All of this is now also available for owners of Commodore's A2091 SCSI host adapter.

Years of experience, technical know-how, and competence from the world's best Amiga software and hardware engineers are condensed in this penultimate product. It makes it possible for the user to productively and comfortably use SCSI, without sacrificing performance, risk of incompatibility, or waste of resources. Together with exhaustive documentation, the "Guru-ROM" enhances each A2091 and each GVP Series-II host adapter with many decisive, and for the serious user, essential features:

• Universal: a SCSI driver without compromise for the A2091, all GVP Series-II host adapters, and all "Combo" and "G-Force" accelerator cards for the Amiga 4000, 3000, 2000, 1200, and 500. Compatible with all 680x0 processors from the 68000 to the 68060. This ROM module, which has been considerably extended in its code and feature set, replaces all previoulsy distributed driver ROMs.
• Fast: unparalleled transfer rates of up to 3.5 MB/s raw (Zorro-II limit), 3.2 MB/s measured with "RawScsiSpeed", 2.9 MB/s measured with "ScsiSpeed" - even on a stock 7-MHz 68000-based Amiga! Even higher figures (3.4MB/s and 3.1 MB/s) possible on GVP host adapters with local RAM; all the while, the CPU typically retains 80% free processing time. Always maximum performance through the automatic selection of the currently optimal transfer mode (DMA, buffered DMA, or PIO).
• Versatile: supports all device types defined in the SCSI standard, such as hard disks, CD-ROM drives, streamers, scanners, and magneto-optical devices.
• 64-bit support: supports the use of media with more than 4 GB of storage capacity, even with existing filesystems.
• Compatible: complete support for the RDB standard, resulting in trouble-free autoboot, automount, and the exchange of devices and media between two computers from Amiga OS 1.3 through 3.1
• Flexible: disconnect/reselect, synchronous transfers, and parity checking can be enabled individually for *each* device (even for devices without an RDB). Also complete write-protection is possible (useful for kiosk applications and for virus protection).
• Intelligent: maximum compatibility with nearly all hardware and software through special handling of all known firmware bugs of the most popular SCSI devices and DMA hardware flaws in the A3000 and A4000, workarounds for internal bugs in the WD SCSI chip, patches for A-Max and Picasso, as well as special modifications to account for defective application software.
• Upward-compatible: fully compatible with both the SCSI-2 and SCSI-1 standards, thereby providing the broadest support for all devices on the market including those still to come.

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