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65: ┌─────⊔︀─────┐ Vss ┤ 1 40├ CA1 PA0 ┤ 2 39├ CA2 PA1 ┤ 3 38├ !IRQA PA2 ┤ 4 37├ !IRQB PA3 ┤ 5 36├ RS0 PA4 ┤ 6 35├ RS1 PA5 ┤ 7 34├ !RES PA6 ┤ 8 33├ D0 PA7 ┤ 9 32├ D1 PB0 ┤10 31├ D2 PB1 ┤11 30├ D3 PB2 ┤12 29├ D4 PB3 ┤13 28├ D5 PB4 ┤14 27├ D6 PB5 ┤15 26├ D7 PB6 ┤16 25├ E PB7 ┤17 24├ CS1 CB1 ┤18 23├ !CS2 CB2 ┤19 22├ CS0 Vcc ┤20 21├ R/!W └───────────┘
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In 1976 Motorola switched the MC6800 family to a depletion-mode technology to improve the manufacturing yield and to operate at a faster speed. The
Peripheral Interface Adapter had a slight change in the electrical characteristics of the I/O pins so the MC6820 became the MC6821.
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generation). The directions for all 16 general lines (PA0-7, PB0-7) can be programmed independently. The control lines can be programmed to generate interrupts, automatically generate handshaking signals for devices on the I/O ports, or output a plain high or low signal.
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The MC6820 became the MC6821 because the electrical characteristic of PA0–7 and PB0–7 pins changed slightly. The typical Input High
Current went from -250 μAdc to -400 μAdc and the Input Low Current went from 1.0 mAdc to 1.3
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MCS6520, all of which are functionally identical but have slightly different electrical characteristics. The PIA is most commonly packaged in a 40 pin
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keyboard and the display. It was also deployed in the 6800-powered first generation of
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family of computers (for example, to provide four joystick ports to the machine). The
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188:. Austin, Texas: Motorola Semiconductor Products. April 1977. pp. 4–6. ADI-429.
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Advanced
Information: 1.5 and 2.0 MHz Components for the M6800 Microcomputer System
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uses two MC6821s to provide I/O access to the video, audio and peripherals.
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320:"Chris Lomont's Color Computer 1/2/3 Hardware Programming"
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www.lomont.org/Software/Misc/CoCo/Lomont_CoCoHardware.pdf
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Motorola MC6820 and MC6821 Peripheral
Interface Adapters
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91:The PIA is designed for glueless connection to the
127:electronic pinball machines (1977-1985), such as
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162:6502 Assembly Language Programming 2nd Edition
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16:Input/output chip for 8-bit microprocessors
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38:providing parallel I/O interfacing for
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285:West, Raeto Collin (January 1982).
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209:. 1976. p. 7. Archived from
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384:and second source/clone vendors
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139:. The MCS6520 was used in the
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464:. You can help Knowledge by
460:This computing article is a
274:. November 1984. p. IV.
160:Leventhal, Lance A. (1986).
29:Peripheral Interface Adapter
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115:The MC6820 was used in the
80:MC6820 and MC6821, and the
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318:Chris Lomont (July 2006).
255:. Bally. 1979. p. 22.
239:. Bally. 1981. p. 22.
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203:Apple-1 Operation Manual
76:Common PIAs include the
288:Programming the PET/CBM
164:. Osborne/McGraw-Hill.
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24:
57:PIA pin configuration
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22:
149:Tandy Color Computer
236:Flash Gordon Manual
291:. COMPUTE! Books.
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36:integrated circuit
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141:Atari 400 and 800
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218:. Retrieved
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130:Flash Gordon
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252:Kiss Manual
101:handshaking
86:DIP package
72:Description
31:(PIA) is a
505:Categories
424:6530 RRIOT
304:2020-04-05
220:2016-03-05
155:References
33:peripheral
434:6551 ACIA
429:6532 RIOT
375:Interface
105:interrupt
42:systems.
419:6529 SPI
414:6526 CIA
409:6525 TPI
404:6523 TPI
399:6522 VIA
394:6520 PIA
78:Motorola
49:MOS 6520
117:Apple I
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168:
95:style
380:from
378:chips
332:5 May
323:(PDF)
272:(PDF)
214:(PDF)
207:(PDF)
191:mAdc.
125:Bally
121:ASCII
462:stub
334:2020
293:ISBN
166:ISBN
143:and
136:Kiss
133:and
103:and
97:bus
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27:A
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