NEW


Lot of Vintage (1988) PIO (Parallel Input/Output) Controllers (10), by SGS (#Z8420BB1)

  • Packaging Condition: GOOD/GREAT - Comes in original anti-static tube packaging, but NO literature - data sheets can be found online (UNTESTED, and never used) and shipped in sturdy 25" mailing tube (SEALED w/pins on each end); chips unaffected - see pics
  • DIP 40 (20 on each side)
  • Made in 1988 (Italy)
  • Selling together as lot of 1 tube of 10 each
  • FEATURES: Provides a direct interface between Z80 microcomputer systems and peripheral devices, Both ports have interrupt-driven handshake for fast response, Four programmable operating modes (byte input, byte output, byte input/output: port A only, and bit input/output), Programmable interrupts on peripheral status conditions, Standard Z80 family bus-request and prioritized interrupt-request daisy chains implemented without external logic, and the eight port B outputs can drive darlington transistors (1.5 ma at 1.5 v)
  • The SGS Z8420BB1 PIO Parallel I/O Circuit is a programmable, dual-port device that provides a TTL-compatible interface between peripheral devices and the Z80 CPU. The CPU configures the Z80 PIO to interface with a wide range of peripheral devices with no other external logic. Typical peripheral devices that are compatible with the Z80 PIO include most keyboards, paper tape readers and punches, printers, PROM programmers, etc. One characteristic of the Z80 peripheral controllers that separates them from other interface controllers is that all data transfer between the peripheral device and the CPU is accomplished under interrupt control. Thus, the interrupt logic of the PIO permits full use of the efficient interrupt capabilities of the Z80 CPU during I/O transfers. All logic necessary to implement a fully nested interrupt structure is included in the PIO. Another feature of the PIO is the ability to interrupt the CPU upon occurrence of specified status conditions in the peripheral device. For example, the PIO can be programmed to interrupt if any specified peripheral alarm conditions should occur. This interrupt capability reduces the time the processor must spend in polling peripheral status.
  • SGS (Società Generale Semiconduttori, English: General Semiconductor Company) was an Italian manufacturer of semiconductor devices, most notably diodes, transistors and DIP ICs. In 1957, Mario Tchou, an engineer from Olivetti, convinced Adriano Olivetti to found an Italian electronic manufacturing company for production of solid-state electronic devices. Olivetti sent his son Roberto Olivetti and Mario Tchou to negotiate with Virgilio Floriani, president of Telettra, to establish a joint venture. Within the same year, Olivetti and Telettra founded Società Generale Semiconduttori (SGS). One of the reasons for SGS's foundation was the need of parts (diodes and transistors in particular) for Elea, a mainframe that was being developed by Olivetti. The headquarters of the company was located in Agrate Brianza. In 1960, Fairchild Semiconductor acquired one third of the company and a joint venture called SGS-Fairchild was formed. That gave SGS access to Fairchild's newly invented planar manufacturing technology. The partnership ended in 1968 and Fairchild sold its SGS stocks to IRI-STET, predecessor of TIM. In December 1971, SGS merged with an Italian semiconductor company named ATES and forms SGS-ATES. On April 23, 1985, the company changes its name to SGS Microelettronica, and 2 years later, SGS Microelettronica merged with Thomson Semiconductors to form SGS-Thomson, which later became STMicroelectronics in 1998.
  • Your shipment will arrive via USPS Priority Mail (1-4 business days) or USPS Ground Advantage (2-5 business days), after the 2-3 day processing time (upon paid purchase)
  • WE COMBINE-SHIP - ASK US FIRST!
  • Shipment(s) sent out of Lemon Grove, California, USA
  • Will be packed very well - read our feedback!
  • No Returns

***AN INVOICE WILL BE SENT AFTER PURCHASE, WHICH MAY REFLECT A MORE ACCURATE POSTAGE RATE FOR THIS ITEM - DON'T PASS THIS UP YET!

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