Commodore Amiga A2091 SCSI + RAM, Hard Drive & Memory Board (As-Is) For Sale


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Commodore Amiga A2091 SCSI + RAM, Hard Drive & Memory Board (As-Is):
$59.75
Appearance: UsedFunctionality: Not Working - to pictured, a Commodore Amiga A2091. Includes just the main board – no other accessories are available. Board is missing components – sold As-Is.
Warranty and Returns:=====================This product is being sold AS-IS without any warranty. Returns are not accepted. To ensure that this is the right product for your needs, we’re happy to answer any questions.
Shipping:=========- Other shipping methods are available – contact us for details.- Combined shipping is available for most items – contact us for details.- Local pickup is also available at no cost.
About Us:=========The Computer Preservation Group is dedicated to the preservation of historical computers. To help fund ongoing operations, select items are made available. To learn more, please visit our website. Thank you for your from amiga resource cx:
CompanyCommodore, USADate1991AmigaA2000, A3000, A4000InterfaceZorro IIAutoconfig ID514 / 2,3,10SCSI controller◾Western Digital 33C93◾uses the same DMAC custom chip for DMA transfers as the A3000◾knows the Rigid Disk Block and SCSI Direct protocols◾built in XT IDE (8 bit) hard disk controller - the connectors and LED are not installed but their place is visible on the card◾50 pin internal SCSI header◾DB25 external connector◾a 3.5" hard disk can be mounted on the card◾16 kB autoboot ROM (can be disabled) - autobooting requires at least Kickstart 1.3◾revision 7.0 of the ROM is necessary for 68040 machines◾supports SCSI network sharing◾supported by Linux, NetBSD and OpenBSD◾A-Max II driver (scsi.amhd)Memory◾sixteen DIP sockets accept 0.5, 1 or 2 MB RAM◾supports 256k×4 (44256) chips, 120 ns or faster◾cannot use DMA to transfer data to 32 bit fast RAM◾if Zorro II DMA memory is not available the driver falls back to programmed I/O transfers◾performs extremely slow in the A4000 because of the above mentioned two problems