First, rename the BOOT ROM (Ver. 27B) file to BOOT.ROM.
Start m23.exe. Press the Control button.
Click on Debug Main CPU.Then, Debug console window opens.
In the debug console, type "bp 66" and return. "bp" meand Break Point. Type "g" and return. "g" mean Go.
Press Reset button.
The program breaks and stops at address 0066H. Type "r a ****" in the debug console. *** is the lower 1 byte of (HL). "r a ****" mean "Set the value of A register to ****". Type "g" and return.
Then, "SET DISKETTE AND STRIKE ANY KEY" is displayed on the emulator screen. Set the diskette and press any key.
Note that this hack requires the value of A register at address 66H to be the lower byte of (HL) for each reset.