Description
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.
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.
Warranty Information
Additional Information
Brand: |
Digi International |
Model: |
30000674 |
Secondary Model: |
30000642 |
MPN: |
30000674 |
PCB Assembly Number: |
30000624 |
PCB Revision: |
Rev D |
SKU: |
22332 |
Type: |
ISA Serial Controller Card |
Bus Interface: |
16-Bit ISA |
Form Factor: |
Full-Length ISA Card |
Connector Type: |
High-Density DB-78 (approx.) External Connector |
Logic ICs: |
DM74ALS257N (National Semiconductor / Fairchild) |
Condition: |
Used – Inspected and in Good Condition |
Country/Region of Manufacture: |
United States |
Compatible With: |
ISA-bus PCs, AT-class systems, DOS/Windows legacy hosts |
Seller Notes: |
Card only; no cables or software included. |
Condition Notes: |
Digi DigiBoard 30000674 16-bit ISA controller card. Inspected, appears in good used condition. PCB shows light handling wear; no cracks or damage noted. Bracket connector intact. Card only — no cables or software. |
