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Updating readme to match wiki
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readme.txt
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readme.txt
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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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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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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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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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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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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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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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Sequential read: 250kb/sec Sequential write: 50kb/sec
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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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Compatibility
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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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