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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.

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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.

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PTI 501-03883-00 CMOS Dual Bus Memory Board 5V VCCA

$89.99 USD

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✓ 30-day returns on every item — return policy

ConditionSurplus - Untested MPN501-03883-00 Stock #0226-00651

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

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Part number 501-03883-00 is silkscreened along the top edge of this vintage industrial CMOS Dual Bus Memory board, accompanied by assembly number 502-03093-40 and a date code of 22-85 indicating February 1985 production. The board is associated with the DDL-350 system per silkscreen designation, and carries serial number 495005 with an additional handwritten notation of 439. The revision level is marked RB 1/84 and the prefix 503 precedes the serial number on the bottom edge.

The memory section of the board is densely populated with Hitachi HM6264LP-15 CMOS static RAM devices in 28-pin DIP packages, each labeled Japan 8506 with lot codes T0002550 and T0002330. These chips are 8K x 8-bit SRAM devices with 150ns access time. The logic and control section incorporates Texas Instruments TTL devices in the LS and ALS families, including SN74LS240N, SN74LS244N, SN74LS273N, SN74LS175N, SN74LS00N, SN74LS11N, SN74LS340N, SN74LS682N, and SN74ALS240-1N, along with SN74S283N adder ICs, an LM339N comparator, and a DM7406N open-collector buffer. Sub-assembly boards 88172-00 (502-70172-00), 88174-00 (502-70174-00), and 88196-00 (502-70196-00) are stickered onto piggyback IC positions. Power supply connections include dual 5V VCCA and 5V VCCA rails visible at CONN P2. The board features three gold-plated edge connectors and white plastic ejector tabs at the upper corners, consistent with a full-length industrial CNC control rack format. A write protect switch (SW1) is visible on the component side with ON and OFF positions labeled.

Stock # 0226-651

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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.