MOS Technology RRIOT

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The 6530 ROM-RAM-I/O-Timer (RRIOT) was an integrated circuit made by MOS Technology, as well as second sources such as Rockwell. It was very similar to the MOS 6532 RIOT, but it incorporated 1 KB of ROM, in addition to the chip's other features. The static RAM, however, was reduced from 128 bytes to 64. Due to the very high degree of integration provided by this chip, it was often used in situations that today would be handled by a PIC microcontroller.

The form factor was a JEDEC-standard 40-pin ceramic or plastic DIP.

External links

• [MOS 6530 datasheet (GIF format, zipped)]
• [MESS emulation code, containing comments on RIOT and RRIOT differences]

Interface chips from MOS Technology and second source/clone vendors