MOS Technology 6532

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Pin configuration of the 6532 RIOT

The 6532 RAM-I/O-Timer (RIOT) was an integrated circuit made by MOS Technology, as well as second sources such as Rockwell. It incorporated 128 bytes of static RAM, two bidirectional 8-bit digital input/output ports, and a Programmable interval timer. This high degree of integration made it quite popular in the late 1970s and early 1980s, as it could take the place of several different integrated circuits (ICs).

Perhaps its best-known application was the Atari 2600 video game console. The chip was also famously deployed in Gottlieb pinball machines, such as Haunted House and Black Hole.

6532 ICs were available in 1 MHz and 2 MHz versions. The form factor was a JEDEC-standard, 40-pin DIP (ceramic or plastic).

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Interface chips from MOS Technology and second source/clone vendors

6520 PIA6522 VIA6523 TIA6525 TPI6526 CIA6529 SPI6530 RRIOT6532 RIOT6551 ACIA