Constant spectrusty::bus::zxinterface1::MAX_HALT_TS

pub const MAX_HALT_TS: i32 = 2 * BYTE_TS as FTs; // 324i32

The maximum additional T-states the Interface 1 will halt Z80 during IN/OUT with DATA port.

Normally accessing port 0xe7 will halt the Z80 until the Interface I has collected 8 bits from the microdrive head. Reading from this port while the drive motor is off results in halting the Spectrum.