Note: This is currently untested. The picture looks like it's from the original docs, but no successful first hand experience has been reported yet. (No unsuccessful either.)
To play motorcycle racing game "RVF Honda" in 2-player link mode, a special "Data Link" cable is required, that connects two Amigas' (or Atari STs') parallel ports.
A "Data Link" cable is not a "laplink" cable, not a "parnet" cable, not a "PC2Am" cable - these are all different. (And it's not any type of serial cable, e.g. nullmodem.)
Basically, "RVF Honda"'s "Data Link" cable connects 8 data lines and pin 25 (GND) pin-on-pin, and pins 11 (BUSY) and 12 (POUT) cross-over, between the two machines' parallel ports.
It's probably good practice to not connect unused pins to avoid side-effects (e.g. pin 14 +5V, Amiga 1000 pin 23).
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| "Data Link" cable wiring/pinout for Amiga and Atari ST computers' parallel/printer port |
As can be seen in the picture, on Atari ST computers' printer port, use pin 1 (STROBE) instead of pin 12.
In addition to the cable, a version of the game is required that supports "Data Link", which is indicated by a menu entry at the bottom of the game's main menu. (Most available Amiga versions should support "Data Link".)
To establish the link, connect both computers while they're powered off, then power on and load the game on one computer, then power on the other one, and load the game on that one. On the first computer, select "Data Link" from the menu.
Note: When a nullmodem cable is used to connect the computers, there might be some activity due to a line shared with the parallel port (serial RI, parallel SEL), but it's just a side-effect..
Additional sources:
https://amiga.abime.net/games/view/rvf-honda
https://imgur.com/AGA5aLN (schematics picture)
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