MAI

MAI 903631-005 CMB 32-Bit Computer System Board Rev AF PCB 905296-001

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SKU:
28189
MPN:
903631-005
Condition:
Used
Availability:
Usually ships within 1-2 business days.
Weight:
4.00 LBS
Shipping:
Calculated at Checkout
  • MAI 903631-005 CMB 32-Bit Computer System Board – top view showing full PCB with ICs and memory chips
  • MAI 903631-005 CMB 32-Bit System Board – reverse side view showing component layout and large processor ICs
  • MAI 903631-005 board label closeup showing part number 903631-005 Rev AF and serial number BA267038
  • MAI CMB 32 BIT PCB silkscreen closeup with DM74AS373N and 74LS393N ICs visible, RP40 and component designators
  • MAI CMB 32 BIT PCB No. 905296-001 Rev C silkscreen closeup with 74LS393N and DM74AS373N ICs visible
  • MAI 903631-005 CMB 32-Bit System Board edge connector view showing four DB-25 female ports on bracket
$125.00
Was: $250.00
Current Stock: 1

Sold Out

Description

MAI 903631-005 CMB 32-Bit Computer System Board Rev AF PCB 905296-001

32-bit computer system board designed for MAI Basic Four minicomputer systems. This card/module serves as a core processing component in legacy industrial and telecom computing platforms.

Specifications & What's Included

  • Model: MAI 903631-005 (PCB 905296-001 Rev C)
  • Hardware Revision: Rev AF
  • Bus Width: 32-Bit
  • Connector Type: DB-25 (Multiple Ports)
  • Form Factor: Card/Module
  • Manufacturer: United States
  • Board only — no cables or accessories included

Applications

This board type was used in MAI Basic Four minicomputer systems, which served industrial automation, process control, and telecommunications applications from the 1980s through early 2000s. The 32-bit architecture provided data processing capability for real-time monitoring and control tasks. These boards are typically found in legacy system upgrades, replacement projects, or system restoration work where original MAI hardware compatibility is required.

Condition: Used
This MAI 903631-005 CMB 32-Bit Computer System Board has been inspected and appears to be in good condition. The board shows light wear consistent with normal use and age — the PCB surface and traces look intact, and the components appear undamaged. The four DB-25 edge connectors on the bracket are present and show no obvious damage. Some light dust and aging on the board is normal for a vintage piece. This is a board-only listing; no cables or accessories are included. Please review our photos closely and contact us with any questions before buying.
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Warranty Information

We stand behind every item we sell with a 30-day money-back guarantee. If your item arrives not as described, you may return it within 30 days for a full refund. Please inspect your purchase upon arrival and contact us with any questions.
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Additional Information

Brand:
MAI
Model:
903631-005
MPN:
903631-005
Secondary Model:
905296-001
Type:
32-Bit Computer System Board
Hardware Revision:
Rev AF
PCB Number:
905296-001 Rev C
Compatible With:
MAI Basic Four Minicomputer System
Form Factor:
Card/Module
Connector Type:
DB-25 (Multiple Ports)
Bus Width:
32-Bit
SKU:
28189
Condition:
Used – Inspected
Seller Notes:
Board only. No cables or accessories included.
Country/Region of Manufacture:
United States
Condition Notes:
MAI 903631-005 CMB 32-Bit System Board, Rev AF. Inspected and in good condition. Light wear consistent with age. Board only — no cables or accessories. Please view photos and contact us with questions.
California Prop 65 Warning:
WARNING: This product can expose you to chemicals including lead and lead compounds, and DEHP (a phthalate), which are known to the State of California to cause cancer and birth defects or other reproductive harm. Go to P65Warnings.ca.gov
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