MOS Technology RRIOT

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 could be used with a microcontroller to comprise a full working computer. Since the incorporated ROM was mask programmed, there were several versions of the chip which was marked as 6530-001, 6530-002 and so on.. Not all the 6530 versions are marked as 6530, especially the later ones that were used in Commodore disk drives. The list of different 6530 chips includes the following:
The form factor was a JEDEC-standard 40-pin ceramic or plastic DIP. Early chips were offered in white ceramic, while later were in purple ceramic or plastic. All chips seems to have been manufactured by MOS technology or Rockwell. A version of 6530-004 by Synertek exists.