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SDD
2fd9286c1a
Adds SCN2681 devices at 0x0640000 (DUART1 = host/printer) and 0x0620000 (DUART2 = keyboard/mouse), gated on VT1200_DUART, with the remap verified as duart_register = handler_off (duart_byte = off*2, value in the low byte of the firmware's 16-bit move). Optional external TX->RX loopback (VT1200_DUART_LB1/2) models the loopback connectors; the monitor switch is driven on IP4-IP6. New VT1200_DUARTLOG gives a full non-deduplicated DUART access log. Result: the level-1 HOST PORT test is reached and executed against the real DUART, but still reports 'LEVEL1/2 ERROR -> HOST PORT - 15'. The test reads SRA/RHRA and requires a 5-byte external pattern (0xAA,0xFF,0xAA,0x55) plus SRA overrun, yet the firmware never writes the transmit register (0 writes to reg 3/B on either DUART in 1400 frames), so no internal or external loopback can supply it. See harness/mame/DUART_REPORT.md. Regression holds: no VT1200_* env -> PC=3FDCE400 samples=199.