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Updated RK03 disk information

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Jeff Parsons 2016-11-23 09:16:27 -08:00 • committed by Jeff Parsons
commit d991d46ef6
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17
disks/dec/rk03/README.md
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@ -13,3 +13,20 @@ RK03 disks are single-platter cartridges with 203 tracks per side, 12 sectors pe
* [RT-11 v4.0](rtl11v4/) [[source](http://skn.noip.me/pdp11/rk1.dsk)] * [RT-11 v4.0](rtl11v4/) [[source](http://skn.noip.me/pdp11/rk1.dsk)]
* [XXDP+ Diagnostics](xxdp/) [[source](http://skn.noip.me/pdp11/rk2.dsk)] * [XXDP+ Diagnostics](xxdp/) [[source](http://skn.noip.me/pdp11/rk2.dsk)]
---
While the geometry of an RK03 disk implies that the total image size should be 2,494,464 bytes, not all the
disks we've archived started out that way. For example, the RT-11 v4.0 disk image was originally 1,454,592
bytes long. Presumably, when it was used by other emulators, they assumed zeros for the missing sectors.
Since the PCjs [DiskDump](/modules/diskdump/) utility relies on exact file sizes to match disk images to
supported geometries, I padded the disk image:
dd if=/dev/zero bs=1 count=1039872 >> RK03-RT11-V40.dsk
After appending an additional 1,039,872 bytes to the original 1,454,592, DiskDump was happy to process the
image:
diskdump --disk=RK03-RT11-V40.dsk --format=json --output=RK03-RT11-V40.json
2494464-byte disk image saved to RK03-RT11-V40.json