I used to write all my code for this CPU in plain machine codes. Granted they weee very easy to remember- in octal form. Eg 10102 - mov R1, R2 Very elegant an

I used to write all my code for this CPU in plain machine codes. Granted they weee very easy to remember- in octal form. Eg 10102 - mov R1, R2 Very elegant and human readable machine code. Btw, the same processor was used in the MK85 “calculator” which in essence was a mobile computer (ca 1990!). I owned one not knowing that fact, and was so amazed to realize it was actually a 1801vm1/vm2 architecture when I unsoldered ROM from it, connected to my parallel port and read its content - it had that familiar code there!!