SCSI2SD old
From code/src wiki
A device that presents a USB Mass Storage device as a Direct Access device to a SCSI controller.
Why ?
Because there are many vintage computers out there that require a 50-pin SCSI drive to boot from. Such disks are only available second-hand, and it's getting harder and harder to find a working disk.
Alternatives
- The price of commercial SCSI converters can be much higher than the vintage computers they are used in. However, these devices are still readily available.
- 50pin to 68pin or 80pin SCSI converters allow the use of newer drives. Availability of new SCSI SCA (80 pin) drives is limited to prohibitively expensive 15K RPM "enterprise" drives.
Why USB ?
Because USB Mass Storage devices already understand SCSI commands.
Parts Required
- SCSI Terminator. TI UC5601DWPG4
- AT90USB1286
- 50 pin IDC header
- USB socket
- 5V supply via Molex drive connector
- (Check) 3.3v to 5v level converter ?
- TI CD74AC280E/74HC280 Parity checker/generator.
Links
The following projects will be of great help:
- AVR based SCSI RAM disk (Open-source AVR microcontroller SCSI interface)
- LUFA Open-source AVR microcontroller USB stack.
- SCSI parity generator
Reference information: