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diff --git a/docs/TMODEM.md b/docs/TMODEM.md new file mode 100644 index 0000000..71aa0ed --- /dev/null +++ b/docs/TMODEM.md @@ -0,0 +1,32 @@ +# T-Modem-c1224 — HyBBX attach + +**AS-IS** · prototype. Public term: **BBX** (not BBS). Never **AX25SRV** in public copy. + +## Role + +HyBBX does **not** run T-Modem L1. Attach to a running **max25d** that has device id **`tmodem`** enabled (USB KISS half-TNC from T-Modem-c1224 Pico firmware). + +| Layer | Owns | +|-------|------| +| T-Modem-c1224 FW | HDLC + bitbang + chip AFSK + PTT | +| MAX25-Stack max25d | Device `tmodem` · `kiss-raw-serial` on `/dev/ttyACM*` | +| HyBBX | Network/BBX attach to max25d only | + +Not BayCom/based. Not SER12. + +## Example (default off) + +```ini +[networks] +tmodem = no +``` + +When max25d already serves `tmodem`, prefer the existing **max25** / host attach path used for other MAX25 devices — enable only after max25d RX proof (RX before TX). + +## Related + +| Doc | Path | +|-----|------| +| MAX25 DEV | MAX25-Stack `docs/DEV/TMODEM-C1224.md` | +| BayCom/based (different) | [BAYCOM.md](BAYCOM.md) | +| TNCs | [TNCS.md](TNCS.md) | |