Calc-U-59
Calc-U-59 Calculator Emulation
About
Explore the inner workings of classic TI-59, TI-58, and TI-58C calculators. This tool offers cycle-accurate emulation, a debugger to inspect code and registers, and a functional paper tape printer recreation. Load and save programs using magnetic card emulation and state files.
What's New in Calc
1.7.0
September 15, 2026
• ERROR MESSAGES: File-load error alerts now show a title that matches what actually failed (state file, card, or ASM load/save) instead of always saying "ROM load error". A state file that isn't valid UTF-8 (e.g. saved with a curly quote or em dash in a non-UTF-8 encoding) now gets a specific explanation instead of a generic "Cannot read file." • STATE FILES: New "PencilColor:" CUECARD keyword ("black" default, or "pencil"/"sharpie") lets a CueCard or MagnetCard's title/row/label text use an ink color that contrasts against the template's printed divider lines instead of blending into them. SolidStateCard is unaffected — it always renders in its fixed printed gold. FIXES • KEYBOARD: Fixed key presses on iOS/iPadOS being dropped intermittently (most presses not registering) under iOS 27's revised touch-gesture timing. Key tracking now reads touches directly instead of through the higher-level gesture API, restoring the same reliable, immediate response as before. macOS input is unaffected. • STATE FILES: Fixed "\blank" CUECARD labels (used to merge grid cells into a spanning label) silently turning into empty labels after a save/reload round trip through "ti58c.mem" — the invisible marker is now written back out as literal "\blank" text instead of a raw zero-width space, which whitespace-trimming was stripping on reload.
MoreFAQ
What classic calculators does Calc-U-59 emulate?
Calc-U-59 emulates the TI-59, TI-58, and TI-58C calculators. It provides cycle-accurate emulation of the TMC0501 processor, including the TI-58C's constant memory feature.
Can I debug programs with Calc-U-59?
Yes, Calc-U-59 features an integrated debugger. You can inspect program memory, data registers, CPU state, and internal SCOM registers live, and step through instructions.
Does Calc-U-59 have a printer simulation?
Yes, Calc-U-59 includes a functional recreation of the PC-100C thermal printer. You can trace printed output and copy it as plain text or a high-resolution bitmap.
How can I load and save programs in Calc-U-59?
You can load and save programs and data registers using the magnetic card reader emulation, which stores them as card files on your device and syncs via iCloud. State files (.ti59, .ti58(c)) can also be loaded for instant machine configuration.
What devices is Calc-U-59 available on?
Calc-U-59 is available on iPad (in landscape mode) and Mac. It is rated for ages 4+.
How often is Calc-U-59 updated?
The latest version, 1.3.0, was last updated on June 20, 2026. The app was released on May 5, 2026, indicating a relatively frequent update schedule.
Does Calc-U-59 have ads?
No, Calc-U-59 does not contain advertisements. It is a free application focused on research and emulation.
What is the user sentiment for Calc-U-59?
Calc-U-59 has a perfect rating of 5.0 stars from 1 review, indicating very positive initial user sentiment.
