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Version
1.1
Size
15.27 Mb
Updated
1 week ago
Released
19 Jan 2026
Description
【 Bring Lions' Commentary to Life 】
If you are studying operating systems, you know the legend: Lions' Commentary on UNIX 6th Edition. It is the "Red Book" that taught a generation of hackers how an OS kernel truly works.
Now, you can bring that bible to life on your iOS device.
【 From Reading to Experiencing 】
The biggest challenge in understanding Unix v6 is that reading code is static, but an operating system is dynamic. We have solved this problem.
We ported the classic Unix v6 to the Intel 8086 architecture (Real Mode) and built a powerful virtual machine around it. This isn't just an emulator—it is an interactive learning environment designed to help you verify the logic described in the book.
【 Key Features 】
The Ultimate Study Companion: Designed specifically to accompany your reading of the Lions' source code. Don't just imagine how the code runs—watch it happen.
Source-Level Debugging: Say goodbye to raw assembly guesswork. Set breakpoints directly in the C source code to pause execution at critical moments.
Precise Execution Control: Master the kernel's logic with full stepping capabilities.
Step In: Dive into function calls to see how the kernel handles sub-routines.
Step Over: Execute lines quickly to grasp the high-level flow.
Step Out: Quickly return to the caller function to understand the call stack hierarchy.
Deep Dive into the Kernel: Struggle to understand the complex flow of context switching or interrupts? Place a breakpoint on swtch() or trap() and trace the execution path line-by-line.
Simplified 8086 Architecture: By running on 8086 Real Mode, the underlying hardware logic is easier to understand than the original PDP-11.
Portable Lab: No complex setups, no QEMU configuration. Your pocket OS laboratory is ready whenever you are.
【 Why This App? 】
Don't just read the history of computing—trace it. Whether you are a CS student grappling with OS concepts or a veteran developer revisiting the classics, this app bridges the gap between theory and practice by letting you walk through the code live.
Estimates
Availability
Devices
iPhone5s
iPadAir
iPadAirCellular
iPadMiniRetina
iPadMiniRetinaCellular
iPhone6
iPhone6Plus
iPadAir2
iPadAir2Cellular
iPadMini3
iPadMini3Cellular
iPodTouchSixthGen
iPhone6s
iPhone6sPlus
iPadMini4
iPadMini4Cellular
iPadPro
iPadProCellular
iPadPro97
iPadPro97Cellular
iPhoneSE
iPhone7
iPhone7Plus
iPad611
iPad612
iPad71
iPad72
iPad73
iPad74
iPhone8
iPhone8Plus
iPhoneX
iPad75
iPad76
iPhoneXS
iPhoneXSMax
iPhoneXR
iPad812
iPad834
iPad856
iPad878
iPadMini5
iPadMini5Cellular
iPadAir3
iPadAir3Cellular
iPodTouchSeventhGen
iPhone11
iPhone11Pro
iPadSeventhGen
iPadSeventhGenCellular
iPhone11ProMax
iPhoneSESecondGen
iPadProSecondGen
iPadProSecondGenCellular
iPadProFourthGen
iPadProFourthGenCellular
iPhone12Mini
iPhone12
iPhone12Pro
iPhone12ProMax
iPadAir4
iPadAir4Cellular
iPadEighthGen
iPadEighthGenCellular
iPadProThirdGen
iPadProThirdGenCellular
iPadProFifthGen
iPadProFifthGenCellular
iPhone13Pro
iPhone13ProMax
iPhone13Mini
iPhone13
iPadMiniSixthGen
iPadMiniSixthGenCellular
iPadNinthGen
iPadNinthGenCellular
iPhoneSEThirdGen
iPadAirFifthGen
iPadAirFifthGenCellular
iPhone14
iPhone14Plus
iPhone14Pro
iPhone14ProMax
iPadTenthGen
iPadTenthGenCellular
iPadPro11FourthGen
iPadPro11FourthGenCellular
iPadProSixthGen
iPadProSixthGenCellular
Pricing by country
| Country | Price |
|---|---|
| Canada | free |
| China | free |
| France | free |
| Germany | free |
| Italy | free |
| Netherlands | free |
| Portugal | free |
| Spain | free |
| UK | free |
| India | free |
| Japan | free |
| Korea, Republic Of | free |
| Poland | free |
| Russia | free |
| Turkey | free |
| USA | free |
| Ukraine | free |
