If the password of OS2XL is entered, the password of OS1 is unnecessary.
Sale of the password of only OS1 has not been carried out now.
Moreover, support of OS1 was ended.
Therefore, even if a bug occurs, it does not fix.
Support of OS3 Ver.1.52 was ended.
Support of OS128XL Ver.1.81 was ended.

JJ OS Comparison Chart
Name Version File name Size Available Upload day
Free 3.16 mpc1000_jv316.bin 734KB Download Feb 16, 2015
OS1 5.00 mpc1000_jv500.bin 896KB Download May 08, 2013
OS3 1.52 mpc1000_jv152.os3 1213KB Download Jan 24, 2017

How to Install OS1

Exchange video to large LCD
OS only for large LCD (240X128) (Please refer to video.)
OS128XL is installable only from OS128ORG bundled with large LCD.
Name Version

File name

 Size Available Upload day
OS128XL 1.81 mpc1000_128xl181.osl 1316KB Download Jan 24, 2017
OS only for large LCD (240X128)
OS128SP is installable only from OS128XL. (Please refer to video.)
(Support of OS128SP was ended)
OS128SP 1.11 mpc1000_128sp111.osl 1349KB Download Aug 01, 2017
 
It is free software to operate a cursor of the MPC with a mouse. (Refer to video)
OS Supported jjos Version

File name

 Size Available Upload day
Windows XP/7/8.1/10 OS2XL/OS3/128XL 1.02 MPCMOUSE.zip 34KB Download Aug 23, 2014