only 16 Multi in Ti/Ti2 ?
 

Virus A, B, C - 128 Multi, Virus Ti, Ti2 - 16 Multi,

to play on the stage too little, why they cut the amount?

Virus TI also has 128 multi programs (from operating system revision 1.1 onwards).

The first 16 multi programs also contains the equivalent of the single programs used. So any changes in the original single programs won't affect the multi program. And any changes in the single programs used in the multi can be stored in the multi program without affecting any single programs.

The multi programs 17-127 works the same way as in the older viruses.