The 6530 ROM-RAM-I/O-Timer (RRIOT) was an integrated circuit made by

MOS Technology MOS Technology, Inc. ("MOS" being short for Metal Oxide Semiconductor), later known as CSG (Commodore Semiconductor Group) and GMT Microelectronics, was a semiconductor design and fabrication company based in Audubon, Pennsylvania. It is mo ...

, as well as second sources such as Rockwell. It was very similar to the MOS 6532 RIOT, but it incorporated 1 KB of

ROM Rom, or ROM may refer to: Biomechanics and medicine * Risk of mortality, a medical classification to estimate the likelihood of death for a patient * Rupture of membranes, a term used during pregnancy to describe a rupture of the amniotic sac * R ...

, in addition to the chip's other features. The

static RAM Static random-access memory (static RAM or SRAM) is a type of random-access memory (RAM) that uses latching circuitry (flip-flop) to store each bit. SRAM is volatile memory; data is lost when power is removed. The term ''static'' differen ...

, however, was reduced from 128

byte The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit ...

s to 64. Due to the very high degree of integration provided by this chip, it could be used with a

microcontroller A microcontroller (MCU for ''microcontroller unit'', often also MC, UC, or μC) is a small computer on a single VLSI integrated circuit (IC) chip. A microcontroller contains one or more CPUs (processor cores) along with memory and programmable i ...

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: * 6530-001 Probably first version MOS TIM-1. * 6530-002 One of two RRIOTs used in the MOS KIM-1 computer. * 6530-003 Second of two RRIOTs used in the MOS KIM-1 computer. * 6530-004 Used in the MOS TIM-1 computer kit. Paired with a 6502 that you had to acquire yourself along with memory and other I/O chips. Very rare. * 6530-005 Unprogrammed 6530. According to OSI note this was used with an empty ROM (which would make it more or less into a 6532). * 6530-006 Allied Leisure pinball version 1 (IC6) *6530-007 Allied Leisure pinball version 1 (IC3) *6530-008 Allied Leisure pinball version 1 (IC5) *6530-009 Allied Leisure pinball version 2 (IC5) *6530-010 Allied Leisure pinball version 2 (IC6) *6530-011 Allied Leisure pinball version 2 (IC3) * 6530-013 Used in the CBM 2040/3040/4040 disk drive DOS 1.0 * 6530-014 Used in Gottlieb system 1 sound board *6530-016 Used in Gottlieb system 80/80A/80B sound boards * 6530-024 Commodore CHESSmate (based upon Peter Jennings MicroChess) * 6530-028 Marked as 901483-01 and used in the CBM 2040/3040/4040 disk drive DOS 1.2 *6530-034 Marked as 901466-04 and used in the CBM 2040/3040/4040 disk drive DOS 2.2 * 6530-036 Marked as 901483-02 and used in the CBM 8050 disk drive DOS 2.5 * 6530-038 Marked as 901483-03 and used in the CBM 8050 disk drive DOS 2.5 * 6530-039 Marked as 901483-04 and used in the CBM 8050 disk drive DOS 2.5 * 6530-040 Marked as 901884-01 and used in the CBM 8050/8250 disk drive DOS 2.7 * 6530-241 MIOT in pinball machines * 6530-243 MIOT in pinball machines * 6530-044 Marked as 901885-01 and used in the CBM 8050/8250 disk drive DOS 2.7 * 6530-047 Marked as 901885-04 and used in the CBM 8050/8250 disk drive DOS 2.7 * 6530-048 Marked as 901469-01 and used in the CBM 8050/8250 disk drive DOS 2.7 * 6530-050 Marked as 251256-02 and used in the CBM 8250LP disk drive DOS 2.7 The form factor was a

JEDEC The JEDEC Solid State Technology Association is an independent semiconductor engineering trade organization and standardization body headquartered in Arlington County, Virginia, United States. JEDEC has over 300 members, including some of the w ...

-standard 40-pin

ceramic A ceramic is any of the various hard, brittle, heat-resistant and corrosion-resistant materials made by shaping and then firing an inorganic, nonmetallic material, such as clay, at a high temperature. Common examples are earthenware, porcelain ...

plastic Plastics are a wide range of synthetic or semi-synthetic materials that use polymers as a main ingredient. Their plasticity makes it possible for plastics to be moulded, extruded or pressed into solid objects of various shapes. This adaptab ...

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.

External links

MOS 6530 datasheet (GIF format, zipped)MOS 6530 datasheet (PDF format)
(checked Oct. 2019)
Hans Otten's 6530 page
(checked Oct. 2019)
C64 wiki page
(checked Oct. 2019)

(checked Oct. 2019) {{Compu-hardware-stub MOS Technology integrated circuits