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SCSI2SD, The SCSI Hard Drive Emulator for retro computing.
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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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-Traditional hard drives last X years. Maybe, if you're luckly, you'll get X years of
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-service from a particular drive. The lubricants wear out, the spindles rust.
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-SCSI2SD is a modern replacement for failed drives. It allows the use ofvintage
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-computer hardware long after their mechanical drives fail. The use of SD memory cards
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-solves the problem of transferring data between the retro computer and a
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-modern PC (who still has access to a working floppy drive ?)
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-
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-Features:
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- Terminator, termpwr, firmware upgradable (via the SD card)
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- Selectable SCSI ID (via jumpers)
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- Emulates a non-removable hard drive (does not present as a removable memory card reader) for maximum compatibility.
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- Unit attention configurability.
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-
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-Technical Specifications:
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-SCSI Interface: SCSI-2 Narrow 8-bit 50-pin connector.
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-SD Card Support:
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- (state max size)
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- Currently SD standard (1GB), no SDHC/SDXC support.
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-Power:
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-Dimensions:
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-
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-Performance:
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-Sequential read/write: 250kb/sec, 50kb/sec. Add some results of some SCSI hard drives
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-for comparison. 160Mb, 250Mb, 1Gb.
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-
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-Compatibility:
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-Tested with Linux, Apple Macintosh System 7.5 on LC-II, LC-III, and LC-475 hardware.
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-Love to hear your success stories on other platforms.
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+*All statistics are made up.
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+Features
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+
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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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+ Firmware updatable over USB (TODO software not yet implemented)
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+ Highly configurable over USB (TODO software not yet implemented)
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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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+
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+
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+Technical Specifications
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+
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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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+
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+
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+Performance
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+
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+As currently implemented:
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+Sequential read: 250kb/sec Sequential write: 50kb/sec
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+
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+These numbers are dreadful. I am working on updating the slow polling SD card
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+communication to use DMA. I expect the performance to reach 1.8Mb/sec.
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+
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+
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+Compatibility
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+
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+Tested with Linux (current), Apple Macintosh System 7.5.3 on LC-III, and LC-475
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+hardware.
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+
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Michael McMaster