How does shipping work for orders on MRO Exchange?

Most orders ship within 1–2 business days via UPS. Larger equipment ships via freight carrier, and customers can use the shipping estimator on the product page for a location-specific quote. Local pickup is also available at the Fairfield, IL facility, typically ready within 4 hours.

What payment methods does MRO Exchange accept?

MRO Exchange accepts all major credit cards, PayPal, and Shop Pay. Purchase order and wire transfer payment is also available, with payment due prior to shipment. Custom terms are available for established accounts.

1 6

PTI 501-03883-00 CMOS Dual Bus Memory Board

$89.99 USD

Sale Sold out

✓ 30-day returns on every item — return policy

ConditionSurplus - Untested MPN501-03883-00 Stock #0226-00659

30-day returns on every item. Photos reflect the actual item’s current condition — see our return policy and condition guide.

Shipping Estimate

⚡ Same-day shipping available — order by 11 am CT ($100 add-on at checkout)

✓ Free domestic UPS Ground shipping — applied automatically at checkout.

Same-Day Available
Real support team
Secure checkout

A CMOS Dual Bus Memory Board from PTI, assembly number 501-03883-00, this card is a vintage industrial PCB designed for dual bus CNC control system architectures. The board carries PCB number 503-52740 and is dated revision B, January 1984, consistent with early 1980s CNC memory expansion technology. The memory array is populated with Hitachi HM6264LP-15 CMOS static RAM ICs, visible across both sides of the board in a high density arrangement. A Tadiran lithium inorganic battery is present on the board for memory backup retention. Onboard logic ICs include Texas Instruments 74LS and 74ALS series devices, supporting the dual bus interface and address decoding functions. The board connects via dual card-edge connectors labeled CONN P1 and CONN P2, consistent with a backplane or motherboard slot installation. A write-protect switch is present and labeled ON and OFF. Board markings indicate 5V VCCA supply requirements at the power connector area. Multiple sub-assembly stickers are visible, including 502-70172-00, 502-70174-00, and 502-70196-00, referencing individual functional blocks on the assembly. This board is intended for use as a spare or replacement in legacy CNC control systems that accept this dual bus memory format.

Stock # 0226-659

View full details

Frequently Asked Questions

Shipping & Handling

Most orders ship within 1–2 business days via UPS, but expedited same-day handling is available as an add-on to orders in cart. Larger equipment ships via freight carrier. Use the shipping estimator above for a location-specific quote. Local pickup is also available at our Fairfield, IL facility, typically ready within 4 hours.

Returns & Condition

All items are sold as-described based on the photos and condition listed. If an item arrives differing from its description, it may be eligible for return or refund. See our full condition guide for details on our grading terms.

Payment Options

We accept all major credit cards, PayPal, and Shop Pay. Purchase order and wire transfer payment is also available by selecting "Purchase Order / Wire Transfer" at checkout. Payment is due prior to shipment. Contact us for custom terms on established accounts. Tax exemptions are honored if proper documentation is provided.