Vintage Commodore Amiga A2091 SCSI Hard Drive Controller Card. Also functions as a fast-ram card, 1MB ram chips are installed (can be fully populated up to 2mb). Internal 50-pin connector and external 25-pin SCSI connector.These were made for the Commodore Amiga 2000 Series (Amiga 2000, Amiga 2500, Amiga 2000HD, etc). 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. 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.
Supported by Linux, NetBSD and OpenBSD. 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. The item "Amiga A2091 SCSI Hard Drive Controller Card 7.0 Rom, DMAC, 200MB HD, 1MB Ram" is in sale since Saturday, October 16, 2021. This item is in the category "Computers/Tablets & Networking\Vintage Computing\Vintage Parts & Accessories". The seller is "pitguard" and is located in Janesville, Wisconsin. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay.