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MOS 6530 Replacement for the KIM-1 SBC

The 6530-002 AND 6530-003 RRIOT (RAM ROM I/O Timer) are the heart of the KIM-1. The mask programmed ROM contains the KIM-1 software, very early and smart 6502 code.
These ICs are not available for a long time now, and that prevents repairing a KIM-1 with a faulty 6530.

Ruud Baltissen designed many years ago a KIM-1 clone, where the 6530 was replaced with the nearly identical, no ROM, 6532. This led to the MicroKIM, the PAL-1, the Corsham clone.
Also boards to replace the 6530 with a 6532, a small EPROM and some glue logic were made.
Bob Applegate and Eduardo Casino did this with PCBs and through hole components. Rather large boards that work fine.

Retrospy Technology used SMD to shrink the PCB to to a bit oversized 6530. Samll enough to fit on a KIM-1 in an IC socket.

Description from the Retrospy store:

Drop in replacement for impossible to find and replace MOS/Commodore KIM-1 specific MOS 6530 integrated circuit.

  • Small footprint.
  • Low profile.
  • Configurable for either U2 or U3 via jumpers.
  • Small enough that 2 can be used simultaneously in U2 and U3.
  • Will fit over most socketed RAM.
  • Requires MOS 6532 RIOT IC to be installed.
  • Requires a socket at U2 and/or U3.

Jumpers on the board switch between 6530-002 and -003.

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RetroSpy Technologies

RetroSpy Technologies produces a range of retro (Vintage) hardware products that are of interest for the KIM-1/SYM-1/AIM 65 owner. Also the PAL-1 user may benefit from the products!
Retrospy is inspired by the Corsham Technologies products and since Bob Applegate is no more among us, produces similar/inspired products.

I bought several products from RetroSpy.

Other interesting KIM-1/AIM 65/SYM- related boards on the Retrospy shop:
AIM 65 I/O board
SYM-1 I/O board
SYM-1 SymDos I/O board
SYM-1/AIM-65 RAM/ROM board
KIM-1 I/O board
2532 to 2764 EPROM adapter
SD Card Storage System (like the Corsham one)

I should have bought he KIM I/O card also, for the 1541 connector, next time!

Dual 6532 adapter board

Dual 6532 adapter board

Replacing the 6530 with a 6532 and ROM and some glue logic is a well known method nowadays.
Eduardo designed a PCB that replaces both 6530-002 and 6530-003 on a standard KIM-1 and of course his replica with a PCB that fits in the IC sockets of the 6530’s. That makes a KIM-1 completely operational!

See this github page for the design.

KIM-1 projects by Eduardo Casino

Since early 2023 Eduardo Casino develops KIM-1 hard- and software. His goal is to replicate as much as possible the original hardware, and make it work. His journey started with an exact KIM-1 Replica.
On this page I present his designs (state of July 2024, the journey has not ended yet, so keep looking at all open hard- and software on github.

My first encounter with Eduardo Casino was this topic on the German forum64.de forum in early 2023

If you do not read German: Eduardo, from Madrid, Spain!, announces his project to replicate a KIM-1 Rev D with the exact layout and look and feel as the original, using hires photos, Inkscape and Kicad.

This is not the first KIM-1 replica, as you can see here. What makes this replica special is that it is an exact PCB
replica. With curved lines! Other replicas may have the same dimensions and look and feel but use the straight modern PCB lines design.
He set a high standard and het continues to amaze us with hardware designs and software around the KIM-1. read all about on the follwing pages:

MTU replicas and additions

K-1008 Visable Memory Replica by Eduardo Casino

K-1013 Floppy Disk Controller replica

KIM-1 Motherboard for MTU Cards
KIM-1 RAM/ROM Expansion Board for the MTU Backplane
KIM-1 Programmable Memory Board for the MTU Backplane

CP/M-65

Version for the K-1013
KIM-1/PAL-1 version

KIM-1 Software

K-1008
XKIM
1541 OS

Commodore Chessmate

I have acquired a Commdore Chessmate! Working well.

Michael Gardi and Stephen Crane are working on Chessmate emulators. Micheal aims for a physical identical one, Stephen uses cheap but powerfull microntrollers.
More on the Chessmate, and the 6530 024 RRIOT (the ROM contains the opening book!) here.

Superjolt and TIM 6530

I have acquired 3! Superjolts. With a Synertek Superjolt CP110 manual and Tiny Basic + RAP (assembler) in ROM.

A good opportunity to update the 6530 and the Jolt SuperJolt pages. Better quality and more documents, more photos, ROMs dumped.

THE-RC 41523 CPU-4

CPU-4 is a 6502 SBC based upon the TIM 6530-004. Developed for teaching on the Technical University Eindhoven.
The only surviving part of the system is a 40 page Dutch manual.
Described are the function of TIM, Tiny Basic and Resident Assembler Program, same as the Jolt and Superjolt.

Dutch manual of RC41523 CPU-4

Some excerpts from the manual:







Known 6530 variants and ROM dumps

6530-002 ROM at $1C00 dump of ROM
$1C00-$1FFF KIM-1 listing in KIM-1 Users manual
6530-003 ROM at $1800 dump of ROM
$1800-$1BFF KIM-1 listing in KIM-1 Users manual
On the 6530-002 and -003 PB6 is CS1. PB5 is a normal I/O pin.

6530-004 ROM at $7000 dump of ROM
$7000-$73FF TIM Terminal Monitor, see the TIM page
On the TIM 65330-004 PB6 is CS1 and PB5 is CS2.

MCS6530-004 Chip Select Equations (thanks Scott Barnes)

6530-005 or R3005-12, no ROM dump
According to this OSI appnote this is an unprogrammed version of the 6530 TIM.
The text in the appnote says:
The 6530-005 is an unprogrammed version of the TIM-1. It has 16 parallel lines as the 6820 but also has a 64 word RAM and a programmable interval timer which can generate an IRQ. The 6530-005 is available from MOS Technology at a cost slightly higher then that of a 6820 PIA.
I have several real 6530-005 IC’s in my stock

MCS6530-005 Chip Select Equations (thanks Scott Barnes)

6530-006 ROM at $1800 Allied Leisure pinball version 1 (IC6)
6530-007 ROM at 1C00 Allied Leisure pinball version 1 (IC3)
6530-008 ROM at $1400 Allied Leisure pinball version 1 (IC5)

Version 2/3 of Allied Leisure Pinball
6530-009 or R0008-11 IC5 ROM at $1400 dump of ROM
6530-010 or R0006-11 IC6 ROM at $1800 dump of ROM
6530-011 or R0007-11 IC3 ROM at $1C00 dump of ROM

6530P R3004-11 ROM dump, probably also a pinball machine part.

R3014-3 System 1 Sound board

6530-012 Gottlieb System 1 sound board (R3014-12)
6530-013 Gottlieb System 1 sound board (R3014-13)

6530-014 Gottlieb System 80 series sound board (R3016-11)
6530-016 Used in Gottlieb system 80/80A/80B sound boards

6530-024 ROM at $8C00 dump of ROM
Commodore Chessmate (based upon Peter Jenning’s MicroChess)

6530-0210 dump of ROM

6530-241 MIOT in pinball machines
6530-243 MIOT in pinball machines

Commodore diskdrives ROM at $FC00-$FFFF

901466-01 6530-??? 2040 DOS 1.0 Shugart SA390 2040, 3040 and 4040
901466-02 6530-028 4040 DOS 1.2 Shugart SA390 2040, 3040 and 4040
901466-04 6530-034 8050 DOS 2.0 DOS 2.1 Shugart SA390

901483-02 6530-036 8050 DOS 2.5
901483-03 6530-038 8050 DOS 2.5 Micropolis 1006-II (8050)
901483-04 6530-039 8050 DOS 2.5 Tandon TM100-3M (8050)
901884-01 6530-040 8X50 DOS 2.7 Tandon TM100-3M (8050) Tandon TM100-4M (8250)
901885-01 6530-044 8X50 DOS 2.7 Micropolis ???
901885-04 6530-047 8X50 DOS 2.7 Micropolis 1006-II (8050) Micropolis 1006-IV (8250) Micropolis 1106-II (Safari, 8050) Micropolis 1106-IV (Safari, 8250)
901869-01 6530-048 DOS 2.7 M.P.I. 101SM (8050)M.P.I. 102?? (8250)
251256-02 6530-050 8250 DOS 2.7 Matsushita JU-570-2 (8250LP)

Most of the information on this pages is also found on the pages of Martin Hoffman Vetter

RIOT 653X datasheets

On this page:

  1. 6530 datasheets
  2. 6532 datasheets
  3. GS65C32 datasheets
  4. Other 65XX RIOT datasheets
  5. Datasheets 6530

    The 6530 was produced by most licensed 6502 manufacturers, from MOS Technology/Commodore SG to Rockwell and Synertek. All production datasheets that I have seen are identical

    The oldest one is a preliminary MOS datasheet for the MCS6530, missing the ordering pages of the production version.
    The most complete datasheet of the 6530 are the Synertek and Rockwell versiona, first in next table.

    Synertek sy6530
    Rockwell r6530 RRIOT
    MOS Technology MCS6530 Memory IO Timer Array
    Preliminary Data Sheet 1975
    MOS Technology MCS6530 Memory IO Timer Array
    Preliminary Data Sheet 1975-08
    MOS Technology MCS6530 Memory IO Timer Array
    Preliminary Data Sheet 1975
    Commodore 6530 6520 datasheet
    Commodore 6530 datasheet
    MOS 6530 datasheet
    > Commodore MOS 6530 datasheet
    MOS6530

    6532

    MOS 6532 RIOT Preliminary feb 1977
    Commodore MOS 6532 RIOT
    Commodore MOS 6532 RIOT
    Rockwell R6532
    Rockwell R6532
    6532 timer interrupt precautions
    6532 timer interrupt precautions
    Rockwell R6532 RAM IO Internal Timer Device (RIOT)
    synertek sy6532

    CMOS 6532

    The 6532 exists in CMOS variants, I have only seen the California Micro Devices GTE 65SC32 variant.

    Synertek 65C32 preliminary
    GTE G65SC32
    CMD G65SC32
    GTE G65SC32

    Other RIOTs

    In Rockwell databooks there are more RIOTs described. 6531, 6534. Never seen in the wild, a mention here and there of being used in pinball machines.
    The timer/counter is a lot more capable, 16 bits etc.

    R6531 ROM-RAM-I/O-Counter (RRIOC)
    R6531 ROM-RAM-I/O-Counter (RRIOC)
    R6531 ROM-RAM-I/O-Counter (RRIOC)
    Rockwell R6534 ROM-IO-Counter (RIOC)

TIM-1 SBC

Christian Ortner (mister-freeze at the VzEkC e. V. forum build a SBC with expansion around a TIM IC.
Here is his projects description of the TIM-1 SBC. TIM-1 OverviewSchematic, images, hex listing of Lunar Lander!