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