IOD-64 ISA 64-Channel Digital I/O Card
64-channel ISA digital input/output card
FEATURES
- 64 digital I/O channels on the ISA bus
- Eight directly addressable 8-bit ports with bit-by-bit input/output programming
- Inputs accept logic-high voltages from 2.0 to 30 VDC
- I/O buffers can be enabled or disabled under software control
- Interfaces with up to four industry-standard 16-position solid-state I/O module racks
- Separate I/O and control-port addressing supports consecutive I/O addresses across multiple cards
- Four inputs can generate host interrupts on IRQ4 through IRQ7
- Four 50-pin headers, one per 16 I/O channels
- Designed and manufactured in the USA
$285.00
In StockDescription
The IOD-64 provides 64 digital input/output channels for ISA-bus computers. Its eight 8-bit ports support bit-by-bit input or output programming, and each I/O point is directly addressable by the host. Inputs accept voltages up to 30 VDC.
Solid-State I/O Rack Interface
The card interfaces an ISA computer with industry-standard, optically isolated solid-state I/O module mounting racks. One IOD-64 can control up to four 16-position racks. The legacy design supports racks from Opto-22, Western Reserve Controls, DuTec, Gordos, and Potter & Brumfield.
Flexible Addressing and Port Control
The I/O ports occupy eight consecutive addresses, with a separately addressable control port. Addresses are selectable within the 200h to 3FFh I/O address range. Separate I/O and control addressing allows the I/O ports of multiple cards to occupy consecutive addresses.
Software can disable any or all of the eight I/O ports through the Output Control Latch. The PC reset signal clears this latch and disables all outputs at power-up or reset.
Hardware Interrupts
When enabled, the IRQ control logic routes signals from any or all of the last four inputs of Port 7 to host interrupts IRQ4 through IRQ7.
Connections
Four 50-pin headers each serve a group of 16 I/O channels. Each header alternates 16 bidirectional data lines with 16 ground lines and also provides +5 VDC from the computer bus and digital ground. An external 1 A fast-blow fuse is recommended for the bus-derived +5 VDC power output.
Modified-COTS (MCOTS) Customization
ACCES can tailor any standard product to your precise requirements — electrical, mechanical, firmware, environmental, or connector-level. Common MCOTS options include alternate I/O ranges, isolation enhancements, firmware changes, private labeling, conformal coating, extended temperature operation, ruggedized enclosures, and military-grade components. If this product is close but not a perfect fit, our engineering team can deliver a rapid-turn MCOTS variant with minimal NRE and dependable, Made-in-USA quality.
PC Interface and Digital I/O
| Bus | ISA |
|---|---|
| Channels | 64 digital I/O channels in eight 8-bit ports |
| Direction control | Bit-by-bit input/output programming |
| Port enable control | Software-controlled enable/disable of individual 8-bit ports |
| I/O addressing | Eight consecutive I/O addresses and a separate control-port address; selectable within 200h–3FFh |
| Interrupt inputs | Last four inputs of Port 7; routed to IRQ4–IRQ7 |
| Connectors | Four 50-pin headers; 16 I/O channels per header |
Digital Inputs
| Logic high | 2.0 to 30 VDC |
|---|---|
| Logic low | −0.5 to 0.8 VDC |
| Input load, high | +20 µA |
| Input load, low | −200 µA |
Digital Outputs
| Logic high | 2.5 VDC minimum to 30.0 VDC with external pull-ups; source 15 mA |
|---|---|
| Logic low | 0.5 VDC maximum; sink up to 40 mA |
Power and Environmental
| Power required | +5 VDC at 450 mA typical |
|---|---|
| Power output | +5 VDC from computer bus; external 1 A fast-blow fuse recommended |
| Card length | 13.1 inches |
| Operating temperature | 0 to 60 °C |
| Storage temperature | −50 to 120 °C |
| Humidity | 0 to 90% RH, non-condensing |
IOD-64 provides 64 digital I/O channels arranged as eight 8-bit ports, with bit-by-bit input/output programming and four 50-pin I/O headers.
| Model | Description | Price (USD) | |
|---|---|---|---|
| IOD-64 ISA 64-Channel Digital I/O Card | The IOD-64 provides 64 digital input/output channels for ISA-bus computers. Its eight 8-bit ports support bit-by-bit input or output programming, and each I/O point is directly addressable by the host. Inputs accept voltages up to 30 VDC. Solid-State I/O Rack InterfaceThe card interfaces an ISA computer with industry-standard, optically isolated solid-state I/O module mounting racks. One IOD-64 can control up to four 16-position racks. The legacy design supports racks from Opto-22, Western Reserve Controls, DuTec, Gordos, and Potter & Brumfield. Flexible Addressing and Port ControlThe I/O ports occupy eight consecutive addresses, with a separately addressable control port. Addresses are selectable within the 200h to 3FFh I/O address range. Separate I/O and control addressing allows the I/O ports of multiple cards to occupy consecutive addresses. Software can disable any or all of the eight I/O ports through the Output Control Latch. The PC reset signal clears this latch and disables all outputs at power-up or reset. Hardware InterruptsWhen enabled, the IRQ control logic routes signals from any or all of the last four inputs of Port 7 to host interrupts IRQ4 through IRQ7. ConnectionsFour 50-pin headers each serve a group of 16 I/O channels. Each header alternates 16 bidirectional data lines with 16 ground lines and also provides +5 VDC from the computer bus and digital ground. An external 1 A fast-blow fuse is recommended for the bus-derived +5 VDC power output. | $285.00 |
Compatible Accessories
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- CAB50F-6 — 6-foot ribbon cable with 50-pin female connectors at both ends
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