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- SCSI2SD, The SCSI Hard Drive Emulator for retro computing.
- Traditional hard drives last 5 years*. Maybe, if you're luckly, you'll get 10
- years of service from a particular drive. The lubricants wear out, the spindles
- rust. SCSI2SD is a modern replacement for failed drives. It allows the use of
- vintage computer hardware long after their mechanical drives fail. The use of
- SD memory cards solves the problem of transferring data between the vintage
- computer and a modern PC (who still has access to a working floppy drive ?)
- *All statistics are made up.
- Features
- In-built active terminator.
- Can optional supply terminator power back to the SCSI bus
- Emulates a non-removable hard drive for maximum compatibility.
- Supports sector sizes from 64 bytes to 2048 bytes
- Firmware updatable over USB
- Highly configurable over USB
- Selectable SCSI ID
- Selectable parity support
- Enable/disable Unit Attention Condition
- Artificial limits on the SCSI disk size (eg. limit size to 4G to avoid OS bugs)
- Sector size (can also be set via the SCSI MODE SELECT command, as sent by SCSI format utilities).
- Technical Specifications
- SCSI Interface
- SCSI-2 Narrow 8-bit 50-pin connector. Supports asynchronous transfers only.
- SD Card Interface
- Standard SDSC (1GB maximum size)
- SDHC (32GB maximum size)
- SDXC cards are untested. Donations welcome.
- Communication is via the SPI protocol at 25MHz.
- Power
- 5V via standard molex drive connector.
- Dimensions
- 10cm x 10cm x 1.5cm
- A 3D-printable bracket is in testing to suit a standard 3.5" hard disk bay.
- Performance
- As currently implemented:
- Transfer size: 512 2048 8192 65536
- -------------------------------------------------------
- read: 2MB/s 2.1MB/s 2.5MB/s 2.6MB/s
- write: 125kB/s 441kB/s 1.5MB/s 2.3MB/s
- -------------------------------------------------------
- Tested with a 16GB class 10 SD card, via the commands:
- # WRITE TEST
- sudo dd bs=${SIZE} count=100 if=/dev/zero of=/dev/sdX oflag=dsync
- # READ TEST
- sudo dd bs=${SIZE} count=100 if=/dev/sdX of=/dev/null
- Compatibility
- Desktop systems
- Mac LC-III and LC-475
- Mac II running System 6.0.8
- Mac SE/30
- Apple IIgs using Apple II High Speed SCSI controller card (from v3.3)
- Symbolics Lisp Machine XL1200, using 1280 byte sectors (from v3.4)
- PDP-11/73 running RSX11M+ V4.6
- Microvax 3100 Model 80 running VMS 7.3 (needs patch against v3.5.2 firmware)
- Amiga 500+ with GVP A530
- Atari TT030 System V
- Samplers
- Roland JS-30 Sampler
- Akai S1000, S3200, S3000XL, MPC 2000XL, DPS 12
- SCSI cable reversed on S3200
- There are compatibility problems with the Akai MPC3000. It works (slowly) with the alternate Vailixi OS with multi-sector transfers disabled.
- EMU Emulator E4X with EOS 3.00b and E6400 (classic) with Eos 4.01
- Ensoniq ASR-X, ASR-10 (from v3.4, 2GB size limit)
- ASR-20 Requires TERMPWR jumper.
- Kurzweil K2000R
- See kurzweil.com for size limits which a dependant on the OS version. Older OS versions have a 1GB limit.
- SCSI cable reversed
- Casio FZ-20M
- Requires TERMPWR jumper. The manual shows the pin25 of the DB25 connector is "not connected".
- May require scsi2sd-config --apple flag
- Yamaha EX5R
- Other
- HP 16601A logic analyzer
- Fluke 9100 series
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