32 lines
1.3 KiB
Markdown
32 lines
1.3 KiB
Markdown
---
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layout: page
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title: DEC RK03 Disk Images
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permalink: /disks/dec/rk03/
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---
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DEC RK03 Disk Images
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RK03 disks are single-platter cartridges with 203 tracks per side, 12 sectors per track, and a sector size of
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256 words (512 bytes), for a total capacity of 2.38Mb (2,494,464 bytes). They are used with an
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[RK11 Disk Controller](/devices/pdp11/rk11/).
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* [RT-11 v4.0](rt11v4/) [[source](http://skn.noip.me/pdp11/rk1.dsk)]
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* [XXDP+ Diagnostics](xxdp/) [[source](http://skn.noip.me/pdp11/rk2.dsk)]
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---
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While the geometry of an RK03 disk implies that the total image size should be 2,494,464 bytes, not all the
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disks we've archived started out that way. For example, the RT-11 v4.0 disk image was originally 1,454,592
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bytes long. Presumably, when it was used by other emulators, they assumed zeros for the missing sectors.
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Since the PCjs [DiskDump](/modules/diskdump/) utility relies on exact file sizes to match disk images to
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supported geometries, I padded the disk image:
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dd if=/dev/zero bs=1 count=1039872 >> RK03-RT11-V40.dsk
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After appending an additional 1,039,872 bytes to the original 1,454,592, DiskDump was happy to process the
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image:
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diskdump --disk=RK03-RT11-V40.dsk --format=json --output=RK03-RT11-V40.json
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2494464-byte disk image saved to RK03-RT11-V40.json
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