vsystem: hook up rs232 to f1gp, gstriker and tail2nos. #14045
Conversation
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Test-Footage. https://youtu.be/jnX99usnKg0?t=40 big thanks to Kale and startaq for their input. |
- renamed rs232a and rs232b in dual port configuration to "com_out" and "com_in". - hooked up the 6850 in the f1gp bootleg. - rs232 devices in f1gp and tail2nos are no longer optional. - removed (default) loopback slot option.
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The one small problem is that the actual baud rate is likely not 19200 or 38400 or any other standard rate. Someone with a PCB of one of these games needs to measure what frequency is present on MC6850 pins 3 & 4. |
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someone on discord offered to trace those on a "super formula" board. has no ways of measuring them though. |
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according to the person on discord, pin 3 and 4 are connected together and fed by pin 6 of a LS393. based on that and the datasheet of a LS393 the divider should be 16. given some tolerances, I'd setup the rs232 defaults with 76800 baud. |
tail2nos and f1gp use an MC6850 with dual DE9 ports to link up to 6 units in a ring.
gstriker has only one DE9 port to link 2 units.
the exact clock of the MC6850 is unknown.
6 players fails at 19200 baud, but works with 38400 baud (and up).