B-4 Specifications
Keyboard
Membrane 85 keys (both U.S. and International) with standard QWERTY-key layout
(International keyboards are country-specific)
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Function keys — 12 keys
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Cursor Control keys — 8 keys; arrow keys arranged in inverted T layout
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Numeric keypad — embedded
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Fn key — function key for ROM-based key functions
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Stroke — 2.5mm
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Height — 6mm
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Pitch — 19mm
External Floppy Diskette Drive
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Size — 3.5-inch
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Capacity — 1.44 MB (formatted), 2 MB (unformatted)
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Transfer Rate — 250 to 500 K/bps
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Number of tracks — 160
Hard Disk Drive
Specifications vary depending upon model:
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Ultra DMA/66 support
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Capacity — Internal 6.x or 12.x GB
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Drive height — 9.5 mm
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Read/write track-to-track seek rate — 3 ms
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Average seek time — 12 ms – 14 ms
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Revolutions per minute — 4200
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Data transfer rate
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16.6 MB/sec (PIO mode4/DMA mode2)
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66.6 MB/sec (ultra DMA mode 4)