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Mark 5 Emulator 1.7.0


Mark 5 Emulator (BML3MK5) is a Hitachi Basic Master Level 3 Mark 5 (MB-6892) emulator for Windows and macOS, source code is also available.


Main functions:


  • CPU: 0.5 to 16 times speed
  • RAM: Standard 64KB + Extended 64KB (assuming MP-9764)
  • Screen display: High resolution up to 640x200 8 colors, IG
  • Sound: MUSIC_SEL, 6-harmonic PSG (assuming MP-9710), 9-harmonic PSG (I / O August 1983 issue)
  • Cassette tape input / output
  • Printer output
  • RS-232C input / output
  • Light pen input: emulated with mouse
  • Kanji ROM: MP-9740 assumed
  • FDD: Available by selecting
    • Assuming single-sided single-density (1S) 3-inch compact floppy (MP-3375, MP-1805)
    • Double-sided (2D) 5.25-inch mini floppy (MP-3550 / MP-3560, MP-1802)
    • Double-sided double-sided (2D) 8-inch standard floppy (MP-3630, MP-1806)


2020-03-07 Version 1.7.0


  • Changed the behavior of IRQ and FIRQ interrupts.
  • Changed the behavior when masking FDC of 8 inch 2D type FD.
  • After writing to the disc, write to the actual image about 5 seconds later performed (delayed writing).
  • Change of CRTC disptmg skew, curdisp skew resets vertical sync bug fixes.
  • The language for menus can be selected in the setting dialog. (However, currently only Japanese and default (English) can be selected)
  • Specify the amplitude of the sine wave to be used for correction in the correction when loading as a wav file I made it possible.
  • [Debugger] Added CPU, PWD, CD, SL commands. Also some behaviors such as BP changed.
  • [Debugger] Changed the method of setting breakpoints.
  • [Debugger] Data dump of 2 bytes or more in memory dump fixed.
  • [Debugger] Fixed the problem that multiple lines cannot be pasted correctly.
  • Other internal code changes.


トップページ - 日立 ベーシックマスター レベル3 マーク5 / S1





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