MK 61/54|工具線上App不用買

Emulator of "Electronika MK 61" and "Electronika MK-54" RPN programmable calculators.

MK-61 was the best seller of all USSR programmable calculators of 1980-s (B3-34, MK-54, MK-56, MK-61, MK-52).

Calculators are emulated on microcode level so they behave exactly like the original devices, including all non-documented features and inaccurate calculations. For ease of use application features saving and loading emulation states.

This app's emulation engine Java code is based on C++ source of Felix Lazarev's emu145 project.

Emulation was highly optimized for speed and should run in real time on any phone.

Hint 1: touch calculator's indicator to toggle slow/fast mode. Indicator's blinking looks better in slow mode.

Hint 2: you can choose between MK-61 and MK-54 using menu option that becomes visible when calculator is switched off.

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History of changes in previous versions:

MK-61 v1.0 - the first working version

MK-61 v1.1 - fixed UI bugs, speed optimization

MK-61 v1.2 - keep state after pressing Home or Back

MK-61 v1.3 - "About" dialog, enlarged digits, added state saving/loading (up to 50 slots)

MK-61 v1.4

- fix emulation for entering negative power of ten

- 10x speed increase - now works even on old Android devices

- touch indicator to toggle fast/slow mode

- on fast phone use slow mode for blinking

- fixed key press detection

- fixed indicator symbols size

- stable states saving - will be compatible with future versions

MK-61 v1.5

- main screen user interface completely redesigned from the scratch:

* authentic look (as much as possible)

* adaptive behavior that fits any screen from 2 to 10 inch

- launcher icon redesigned

- added slight vibration on button press, more sensible on angle mode change, even more intensive for on/off switch

- screen never goes off even when nothing is touched for a long time

MK-61 v1.6

- added "Settings" page to let user choose vibration and/or disabled screen auto-off

- indicator font size fix for tablets

MK-61 v1.7

- fixed ГРД angle mode switch position (was acting as Degrees mode instead of Grads)

- saved states now can have names. Hint: load and save state to rename it.

- use up to 99 saved states now instead of 50

- added Russian user interface translation

- a number of polishing UI tweaks on the main and settings screens

MK 61/54 v2.0

- added MK-54 emulation

- application name was changed to "MK 61/54" to reflect the fact it supports both devices

- when calculator is switched off, selector button chooses between "MK 61" and "MK-54"

- save states remember which calculator type they were saved with

- old save states use MK 61 device

- added soft "Menu" button on devices that lack hardware menu button

- added support for older Android versions, including Android 1.6

- additional UI polishing for tablets

v2.1:

- "MK 61 ↔ MK-54" button is now menu option (available when calculator is off)

- "About" moved from settings to menu, now with usage hints

- fixed calculator's display font size issue:

* entering power of ten should not split display into two lines (was an issue on some devices)

* width should be fully used

- ШГ→/ШГ←/↔ got better labels

- fixed/improved layout on devices with low and medium resolution

v2.2:

- fixed UI scaling issue on normal-mdpi screens

- improved large-mdpi screens

If you still have issues - please let me know device/firmware this happens on.

- added thin border around buttons

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