{"title":"PTI","description":"\u003cp\u003eIndustrial surplus PTI parts and equipment, in stock at MRO Exchange.\u003c\/p\u003e","products":[{"product_id":"pti-cmos-dual-bus-memory-board-501-03883-00-5v-vcca-0226-650","title":"PTI 501-03883-00 CMOS Dual Bus Memory Board 5V VCCA","description":"\u003cp\u003eThe silkscreen on this vintage PCB identifies it as a CMOS Dual Bus Memory board, part number 501-03883-00, assembly number 502-03093-40. The date code 22-85 indicates a February 1985 manufacture date. The board carries the system designation DDL-350 in silkscreen, and serial number 495005 is marked on the component side edge. Supply voltage is labeled 5V VCCA per silkscreen marking.\u003c\/p\u003e\n\n\u003cp\u003eThe board is populated with Hitachi HM6264LP-15 CMOS static RAM ICs, which are 8K x 8-bit devices rated at 150ns access time in a 28-pin DIP package, date coded Japan 8506. Multiple rows of these SRAM chips cover the majority of the board surface. Logic ICs on the control section include Texas Instruments SN74LS series devices including LS240, LS244, LS273, LS175, LS04, LS00, and LS10 types, as well as SN74S283N adder ICs and an LM339 comparator. Sub-assembly stickers on the board identify additional reference numbers 88172-00, 88174-00, and 88196-00 (assembly 502-70196-00). The board is constructed on a green fiberglass substrate with three gold-plated edge connectors for backplane installation, with white plastic ejector tabs on two corners. The board dimensions are consistent with a full-length industrial CNC control rack card.\u003c\/p\u003e\n\n\u003cp\u003eStock # 0226-650\u003c\/p\u003e","brand":"PTI","offers":[{"title":"Default Title","offer_id":48890921910512,"sku":"m00650","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0797\/6648\/7280\/files\/F5CA6C0C-BB3B-45A0-966A-CA8FFDE67FA1.png?v=1784210339"},{"product_id":"pti-cmos-dual-bus-memory-board-501-03883-00-5v-vcca-0226-651","title":"PTI 501-03883-00 CMOS Dual Bus Memory Board 5V VCCA","description":"\u003cp\u003ePart 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.\u003c\/p\u003e\n\n\u003cp\u003eThe 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.\u003c\/p\u003e\n\n\u003cp\u003eStock # 0226-651\u003c\/p\u003e","brand":"PTI","offers":[{"title":"Default Title","offer_id":48890927808752,"sku":"m00651","price":99.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0797\/6648\/7280\/files\/34CB2643-37A3-4101-82FC-D3E48B16F9CA.png?v=1784210336"},{"product_id":"pti-cmos-dual-bus-memory-board-501-03883-00-0226-659","title":"PTI 501-03883-00 CMOS Dual Bus Memory Board","description":"\u003cp\u003eA 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.\u003c\/p\u003e\n\n\u003cp\u003eStock # 0226-659\u003c\/p\u003e","brand":"PTI","offers":[{"title":"Default Title","offer_id":48891020542192,"sku":"m00659","price":129.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0797\/6648\/7280\/files\/95871071-E6D0-4450-951A-AAA303A48AEA.png?v=1784212520"},{"product_id":"pti-electronics-cmos-dual-bus-memory-board-501-03883-00-0226-640","title":"PTI 501-03883-00 CMOS Dual Bus Memory Board","description":"\u003cp\u003eA CMOS Dual Bus Memory board from PTI Electronics, this card carries part number 501-03883-00 with secondary board number 502-03093-00 visible on the label. The date code reads 22-85, indicating manufacture in 1985. The board is populated with Fujitsu MB8416A-15L 2Kx8 static CMOS RAM integrated circuits across multiple IC positions, with date codes ranging from 8433 to 8449, consistent with the 1984 to 1985 production timeframe. Logic support ICs visible in the lower section of the board include SN74LS640N, SN74LS340N, SN74LS273N, SN74S283N, SN74LS240N, SN74LS244N, SN74LS04, and related 74-series logic devices. The board features gold-plated card edge connectors on three sides, consistent with a multi-bus or proprietary backplane interface used in industrial CNC or process control systems of the period. Silkscreen labels identify connectors as CONN A1, CONN P1, and EXPANSION BUS. A write protect switch labeled SW1 is present, with ON and OFF positions marked. The board also carries internal sub-assembly references 502-70144-00, 502-70145-00, and 502-70146-00 visible on installed daughter components. Serial number 465004 and lot reference RB 1\/84 are printed on the board edge. The board is stored in its original anti-static protective bag. Compatible system application is not confirmed from photos alone.\u003c\/p\u003e\n\n\u003cp\u003eStock # 0226-640\u003c\/p\u003e","brand":"PTI","offers":[{"title":"Default Title","offer_id":48891783086320,"sku":"m00640","price":399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0797\/6648\/7280\/files\/A3D87501-1491-427C-99D7-7F5FD4407193.png?v=1784209646"}],"url":"https:\/\/mroexchange.com\/collections\/pti.oembed","provider":"MRO Exchange","version":"1.0","type":"link"}