The RTI also has a programmable peripheral interface ( PPI ) consisting of three 8-bit ports for transferring data, address, and control signals between console and the VAX console interface.
2.
The RTI also has a programmable peripheral interface ( PPI ) consisting of three 8-bit ports for transferring data, address, and control signals between the console and the VAX console interface.
3.
Other comparable I / O chips are the 2655 Programmable Peripheral Interface from the Signetics 2650 family of microprocessors, the Motorola 6820 PIA ( Peripheral Interface Adapter ) from the Motorola 6800 family, the Western Design Center WDC 65C21, an enhanced 6520, and many others.
4.
The standard consisted primarily of several VRAM, the sound and partial I / O support was provided by the AY-3-8910 chip manufactured by General Instrument ( GI ), and an Intel 8255 Programmable Peripheral Interface chip was used for the parallel I / O such as the keyboard.
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