NoDi vs XEQ41

NoDi: No Distractions & Focus Feeling distracted or struggling to focus? Too many distractions? Let NoDi be your personal focus companion! With soothing lofi music and powerful productivity tools, including a stopwatch timer and pomodoro timer, NoDi helps you get into the zone and stay on track for your study, work, or creative sessions. Focus with Lofi Music Immerse yourself in calming lofi beats that make focusing easier and more enjoyable. Whether you’re studying with ADHD, enjoying a quiet night, or starting a fresh morning, NoDi offers a variety of music to set the perfect mood for concentration. Play Lofi with Ambient Sounds Take your focus to the next level by combining lofi music with ambient sounds. You can play lofi alone, ambient sounds alone, both together, or simply use the timer without any audio. Adjust your focus environment for stress relief and better concentration. Brainwave Sounds for Focus, Rest & Sleep Brainwave Sounds provide optimally tuned audio that matches your brain state, helping you naturally shift into focus, relaxation, or sleep whenever you need it. Set the Mood with Your Ideal Background Your environment shapes your focus—visually, too. With NoDi, you can now discover and set the perfect background image that suits your vibe. From cozy study corners to serene nature views, choose a backdrop that inspires calm and clarity while you work or study. It's your space, your way. Stay Focused with Flexible Timer Modes NoDi’s built-in timer is designed to match your focus style. Use pomodoro timer mode to work in structured intervals with regular breaks, or switch to stopwatch mode for open-ended sessions when you want to stay immersed without limits. Whether you prefer guided focus or total freedom, NoDi’s timer adapts to the way you work. Track Your Focus & Growth How productive have you been today? NoDi helps you keep track of your focus time, making it easy to see your productivity progress. Recording and analyzing your study or work sessions helps you stay motivated and shows you how much you’ve accomplished over time. Unlock Your Insight Report Go beyond simple time tracking with your personalized insight report. Understand your productivity rhythm, sleep debt, social jetlag, and burnout level in one clear report. Use these focus insights to improve and maintain a sustainable focus journey, and strategically plan your tasks based on real data about how you work best. With NoDi, you can: Track how much time you’ve spent focused on tasks. Monitor your productivity trends and stay motivated. Get a sense of how you’ve improved over time, helping you feel accomplished and ready to tackle your next task. Build Your Focus Routine Transform your focus into a daily habit with NoDi! Start each day with lofi beats and create a consistent routine that helps you focus better. Our simple study timer helps you stay on track, so you can build a habit of deep concentration that lasts. This is especially helpful for those with ADHD, supporting both concentration and stress relief. Perfect for Every Task Whether you’re studying for exams, working on a project, or just need to get through your to-do list, NoDi is here to help you stay focused. Use the pomodoro timer or study timer to boost your productivity during any study session. NoDi is Needed When… • You’re struggling to focus while studying. • Your mind is wandering during work. • You want to immerse yourself in lofi music and ambient sounds. • You want to track your focus time and monitor productivity trends. • You want to create the perfect environment for deep concentration. • You need stress relief or better concentration, especially if you have ADHD. Are you ready to get more done, stay focused, and track your progress? Download NoDi now and start focusing like never before! Website: https://daarbit.com/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Contact us: support@daarbit.com

XEQ41 is a hand-written emulator of a 1983 programmable RPN calculator, running the original manufacturer's microcode on a simulated NUT processor. It is not a re-implementation of the machine's behaviour — it is a simulation of its processor, so the calculator on screen executes the same instructions the hardware executed, and does what the hardware did for the same reasons. THE DETAILS THAT GET TESTED • Hold a key too long and the microcode itself cancels the function and prints NULL. That is 7,100 instructions — 1.23 seconds at original speed. Nobody wrote a timer; the ROM does it, and it stays 1.23 seconds when you run the machine faster. • BEEP is four tones, not three: 578, 361, 722 and 578 Hz, because the microcode falls through into a fourth. The test was written expecting three and the machine corrected it. • The display is modelled as a liquid crystal panel rather than sampled as a register, so the half-built strings the hardware never showed stay hidden and the 174 ms blink it does intend does not. • Continuous memory. Close it, force-quit it, come back next week — it is where you left it. • Shift-ON puts up a running clock, exactly as the manual says. THE FACEPLATE IS DRAWN, NOT PHOTOGRAPHED Thirty-nine moving key caps, the glass and the annunciator row are all vector, generated from a measured coordinate table — sharp at any size, with no image assets anywhere. A key going down travels, closes the shadow beneath it and darkens. The fourteen-segment display face is ours outright, drawn from our own segment table, so no third-party font ships. Every key is an accessibility element whose label is composed from the printed legend, so VoiceOver says "x squared" where the plate prints x². WHAT IS IN IT • FOCAL programming, with program files in and out through Files • Extended Memory, with real file structure • Four ports for plug-in module images you supply • The 82143A thermal printer and its paper tape, once you supply its ROM image • Synthetic programming — the byte grabber runs • Saved machines that record what was plugged in and refuse to open as something else • Alarms, the clock, BEEP and TONE, LCD contrast, haptics • Fifty transcribed keyboard overlay cards • Three faceplate palettes, and an optional extra display for the stack or the machine's status • Seven FOCAL programs written for this app, free to use and modify HOW IT IS CHECKED Thirteen scripted scenarios run byte-identical against a second, independent implementation of the same processor. Six programs from printed sources reproduce their published answers, including a polynomial fit and a singular linear system whose correct answer is the degenerate one. All thirty coordinates of a published planetary ephemeris match to the seven digits the display carries. 728 tests. PRIVACY There is no networking code in the app at all. No account, no analytics, no advertising, no tracking, nothing collected. Everything stays in the app's own storage on your device. GOOD TO KNOW It is one specific machine, reproduced quirks and all — RPN, FOCAL programming and the original operating system. If it is the one you were after, this is it. Third-party module images — the printer's ROM among them — are yours to import; we do not distribute them. COMPATIBILITY XEQ41 is functionally equivalent to the HP-41CX. XEQ41 is not affiliated with, authorized by, endorsed by, or sponsored by Hewlett-Packard. HP, Hewlett-Packard and HP-41 are trademarks of their respective owners.