The National Instruments NB-DIO-24 is a digital input/output board for legacy Macintosh NuBus systems. NI documents three 8-bit ports with mode-dependent handshaking capabilities.
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Key product information and technical features.
The NB-DIO-24 belongs to NI's Macintosh NuBus data acquisition hardware. Its software requirements must be evaluated as part of a legacy system, rather than assumed from support for later NI interfaces.
Ports 0 and 1 support read or write operation with handshaking enabled or disabled; port 0 can also be bidirectional. Port 2 has no handshaking and becomes unavailable when either other port uses handshaking.
Verified product specifications.
| Bus interface | NuBus |
|---|---|
| Digital port organization | 3 ports, each 8 bits wide |
| Port direction | Read or write; port 0 may be bidirectional |
| Port 2 limitation | Unavailable if port 0 or port 1 uses handshaking |
| Digital I/O clocks | None |
| Transfer methods | Interrupts for ports 0 and 1; software polling for port 2 |
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Host platform and bus
Digital I/O board
NI lists NB-DIO-24 among the NuBus devices supported by Macintosh NI-DAQ 4.9.4.
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Product-specific answers based on available technical information.
NI identifies it as a NuBus device for Macintosh systems.
No. NI states that port 2 is unavailable when port 0 or port 1 uses handshaking.
NI's Macintosh support article lists the NB-DIO-24 under NI-DAQ 4.9.4. It also states that NI-DAQ 6.x does not support NuBus devices.