Digi DigiBoard 30000674 16-Bit ISA Controller Card 30000642 30000624 Rev D
Digi DigiBoard 30000674 16-Bit ISA Controller Card 30000642 30000624 Rev D
The Digi DigiBoard 30000674 is a full-length 16-bit ISA expansion card designed to add multi-port asynchronous serial connectivity to ISA-bus host systems. Also referenced under part number 30000642, this board carries the PCB assembly number 30000624 at Revision D. DigiBoard ISA serial cards were a staple product from Digi International, enabling AT-class PCs and compatible workstations to support multiple serial devices simultaneously — a common need in industrial control, point-of-sale, data acquisition, and terminal server applications of the era.
Specifications & What's Included
- Manufacturer: Digi International (DigiBoard)
- Part Number / Model: 30000674
- Secondary Part Number: 30000642
- PCB Assembly Number: 30000624, Revision D
- Bus Interface: 16-bit ISA (AT-compatible)
- Form Factor: Full-length ISA expansion card
- External Connector: High-density multi-pin D-sub style connector on the slot bracket (DB-78 class, for serial port breakout cable/octopus cable)
- Logic ICs: DM74ALS257N (National Semiconductor / Fairchild Advanced Low-Power Schottky multiplexers) — multiple units visible on PCB
- Main controller IC: Large PLCC package on component side (markings not fully legible in photos)
- Board-mounted crystal oscillator present
- Included: Card only — no breakout cables, software, or documentation
Applications
DigiBoard ISA multi-port serial cards were widely used from the late 1980s through the mid-1990s in any environment where a single PC needed to communicate with multiple serial devices at once. Typical deployments included multi-user terminal server setups (connecting ASCII terminals or dumb terminals to a single host), industrial automation (connecting PLCs, barcode readers, serial sensors, and SCADA devices), point-of-sale systems, and data acquisition from serial instruments. The full-length ISA form factor places this card firmly in the AT-bus era — compatible with IBM PC/AT and the wide range of 286, 386, and 486-class machines that used the 16-bit ISA bus before PCI became the dominant standard in the mid-1990s. Today, these cards are sought by legacy system maintainers keeping older industrial or custom-built systems operational, as well as collectors of ISA-era hardware.
Condition: Used
This Digi DigiBoard 30000674 16-bit ISA controller card has been inspected and appears to be in good used condition. The PCB shows typical light handling wear consistent with a pulled board — no cracks, burn marks, or obvious physical damage noted. The high-density external bracket connector appears intact. Please view our photo set and contact us if you have any questions. Visit Our Store
Shop industrial, solar, scientific, vintage computing, electronic test, audio-visual, office equipment, and manuals in our store. Start shopping »
Follow Our store
Want first pick on new arrivals? Tap Save Seller at the top of any page — alerts you the moment we list something new.
Fast Shipping
We ship via most standard carriers. Local pick-up available at our Ventura, CA warehouse.
About Us
Questions? Contact us anytime. Learn more about us »
Best Offers
Want to make an OFFER but don't see a MAKE OFFER button? Use the Contact Seller button at the top of this listing.
30-Day Guarantee
100% satisfaction guaranteed. Any issue, just reach out — we'll make it right.
Thank you for shopping with us.
