How to start this game from MAME's swlist (RB asked):
mame kim1 kimvent
There are brief instructions in the hash file:
Enter 'R -00F1=00 -17F9=A1 -1873X'. Play tape, pause when display shows 0000 (P). '-17F9=A2 -1873X', (P), '-17F9=A3 -1873X', (P), '-0100X'.
I'll make them more verbose:
Either type (pc keys) or do a MAME UI paste (shift+scrlock by default):
R -00F1=00 -17F9=A1 -1873X
(00F1 is for configuring decimal mode, 17F9 is for entering the tape file ID, 1873 is for loading)
Play the tape from beginning, and when display shows "0000 xx", pause the tape before the next segment starts. The tape won't pause automatically when the segment has finished loading.
Type/paste: -17F9=A2 -1873X
Unpause the tape, and when display shows "0000 xx", pause the tape before the next segment starts.
Type/paste: -17F9=A3 -1873X
Unpause the tape, and when display shows "0000 xx", pause the tape before the next segment starts (latter isn't really needed since this is the last segment of the main program)
Type/paste: -0100X
The game starts.
Pausing the tape all the time is annoying. Since it looks for the unique ID to load, it's not really necessary to do this. You can simply rewind the tape before loading the next segment, and hold INS to fastforward MAME until you see "0000 xx".