AIM 65 clone

Mr. Nagano, from Tokyo, Japan send me photos and circuit diagram of an AIM 65 clone he built. It is a beautiful and functionally and esthetic faithful clone. In fact, he built two, one with a CPLD 3V3 version and a 5 V version with a 6532 RIOT.

Read all about it here.


AIM 65 clone

Mr. Nagano, from Tokyo, Japan send me photos and circuit diagram of an AIM 65 clone he built.

It is a beautiful and functionally and esthetic faithful clone. In fact, he built two, one with a CPLD 3V3 version and a 5V version with a 6532 RIOT.

Features of the AIM-65 clone


  • TTY Interface (usb-serial)
  • Thermal Printer
  • QWERTY keyboard
  • 20 x 16-Segment Display
  • No Cassette Tape Interface

Power Supply

  • Main Logic: 3.3V
  • 16-Segment Display : 5V
  • Thermal printer: 9V


    • 16, 12, 8MHz etc. can be selected by replacing the OSC module.
    •   In addition, 1, 1/2, 1/4, 1/8 can be selected by the DIP switch on the CPLD board
  • Peripherals ( VIA/PIA/RIOT ) :
    • If the CPU clock is set to 1 or 1/2, peripherals will run at 1/4 of that frequency.
    • When the CPU clock is set to 1/4 or 1/8, peripherals run at the same frequency as the CPU.

The following can be selected by setting the DIP SWITCH of the FLASH memory board.

  • 010: PL65/ASSEMBLER
  • 011: GWK-BASIC V2.1 for Siemens PC100
  • 100: Instant PASCAL
  • 101..111: Reserved

Mr. Nagano also made a version with a voltage of 5V and running at 2MHz. R65C02, R65C22, R6532A are used for it.

AIM 65 Assembler ROM R3224 source

On the pagetable Commodore source archive I found the source of the AIM 65 Assembler ROM R3224.

Now on the AIM 65 software page:

Assembler ROM R3224 source from pagetable github

The Best of Micro 3

Partial scan of The Best of Micro 3: AIM 65 SYM-1 KIM-1 part and General (6522).


Updates to KIM-1, AIM 65 and SYM-1 pages

With the help of users on the German Classic Computing forum I have added many manuals and magazines in German about those systems:

AIM 65 PC100 manuals
MICROMAG magazines
KIM-1 manuals in German

I also added books on the 6502 in general and on the KIM-1, SYM-1 and AIM 65 to the Books section.

Reading old magazines is always fun, from the period 1976 to 198x magazines were filled with articles on the 6502, the KIM-1 and other SBC’s.

German, Dutch and English magazine articles extracted here.
Kilobaud, Byte, Dr Dobbs and of course the dedicated 6502 User Notes, MICRO Journal and Compute are valuable sources, but look at the many magazines on this page!



Es lebe der KIM-1
Experimente fuer Anfaenger mit KIM-1
Siemens PC 100
Wer ist Jim Butterfield?
Realtime clock fur PC 100
Konzert fur AIM 65
Basic-Morse programm fur AIM 65 PC 100
Interrupt beim AIM 65
Tone und Gerausche mit AY-3-8912 und einem 6502 computer
AIM 65 Assembler und Disassembler
Dgital-Analog and Analog-Diital Wandlung mit den 8-bit DA-Wandler ZN 428E
Die Verwendung des PPI 8255 an einem 6502 System Apple II
Einfacher 6 Kanal Analog Digital Wandler
Rechteckgenerator und Frequenzmesser fur AIM 65
Lernen mit AIM 65 1-7
Programmieren in Maschinensprache 1-5


Pages from CHIP 9 1978 and CHIP Special 1981

Siegerkur 6502 6800 8080 SC/MP
Stunde der Wahrheit KIM-1
Von Alpha bis Omega MCS Alpha 65
A/D und D/A fur Sprachverarbeitung
Dynamische Schreib-Lese Speicher fur 6502-systeme
KIM-1 steuert SR51
AIM 65 als interrupt-gesteuerten Frequenzzahler
Schrift und graphik aus einem IC
Systemerweiterung fur KIM-1


AIM 65/40

The AIM 65/40 is a SBC with the look and feel of the AIM 65, , with a 40 character display (over the 20 of the AIM 65). More memory, more ROM, User prioritized interrupts, RM 65 bus expansion.


AIM = Advanced Interactive Microcomputer.
65= Rockwell 6502 processor.
40= 40 column display.

An upgrade of the original Rockwell AIM-65, this model has a larger display, among other features.

The four edge-card connectors are labeled:

  • Parallel
  • Serial
  • TTY
  • Expansion

From the Rockwell “Interactive” newsletter, issue no. 5:

Rockwell International will shortly be introducing the AIM 65/40. The AIM 65/40 microcomputer is made up of an R6502 based single board computer with on-board expansion to 65 kilobytes of memory, a full graphics 280 X N dot matrix or 40-column alphanumeric printer, a 40-character alphanumeric display, and a full ASCII keyboard with user assignable function keys.

An advanced generation of Rockwell’s popular AIM 65 microcomputer, the AIM 65/40 will be available as a complete system or as individual computer and intelligent peripheral modules.

The AIM 65/40 Series 1000 single board computer modules feature system address expansion up to 128K bytes with on-board memory up to 48 kilobytes of RAM and up to 32 kilobytes of ROM or EPROM. Six level priority interrupt logic and 16-bit multi-mode timers are included for flexibility in production automation and laboratory control applications. Extensive I/O capability provides an RS-232C asynchronous communications interface channel with programmable data rates of up to 19,200 baud for terminals or modems, plus a 20 ma current loop TTY interface, dual audio cassette interfaces, and two user-definable 8-bit parallel ports with handshake control, two 16-bit timer/counters and an 8-bit serial shift register.

Three additional 8-bit parallel ports are directly programmable as dictated by the user’s application to provide more TTL level I/O or interface to keyboards, displays, and printer modules. Manufacturer supplied ROM resident software included with the AIM 65/40 Series 1000 computer provide I/O drivers for the intelligent peripherals and more. The printer connector is compatible with the Centronics parallel interface that is so popular with high speed dot matrix printers.

A buffered system bus accommodates off-board expansion via Rockwell’s RM 65 microcomputer modules which include intelligent peripheral controllers for mini or standard floppy disks, CRT monitors and the IEEE-488 instrumentation bus, plus additional communications interfaces and a selection of RAM, ROM and EPROM memory expansion options up to 128K bytes of memory and memory-mapped I/O capacity.

The AIM 65/40 Model 0600 graphics printer module consists of an intelligent microprocessor controller integrated with the printer mechanism. The module operates in two modes. Character mode operation prints upper and lower case ASCII character font formatted as 40-characters/line at 240 lines/minute. Full graphics mode outputs any data pattern desired as a 280 X N dot matrix. With its own microprocessor controller, user changeable character generator ROM, thermal head drivers, motor control, and parallel handshake ASCII interface, this freestanding peripheral minimizes demand on the AIM 65/40 central processor, permitting maximum system performance.

The Model 0400 display module features a bright, crisp vacuum fluorescent 40-character alphanumeric display. This stand-alone module has its own microprocessor controller for display of alphanumeric, special, and limited graphics characters, parallel handshake ASCII interface, support circuitry and operates from a single +5 volt power supply. Special control commands permit variable display timing, cursor control, auto-scroll, and character blinking.

The Module 0200 keyboard module provides a terminal style alphanumeric and special character keyboard matrix with 64 keys, including locking ALL CAPS, control, and eight user definable function keys. Three keys labeled ATTN, RESET, and PAPER FEED have dedicated lines to the interface connector.

The AIM 65/40 Series 5000 incorporates a ROM resident software system and integrates all four modules into a complete microcomputer system. The interactive monitor software controls the AIM 65/40 system with single keystroke, self-prompting commands, supports software development with assembler, debug and control commands. A multi-file text editor supports both line and screen editing functions. Optional languages include a fully symbolic R6500 assembler and BASIC. FORTH, PASCAL, and PL/65 software packages are in development.

The AIM 65/40 is expected to be available sometime during the third quarter of 1981.

The following photos and files are given to me by Jörg, Ross Milbourne and David Colglazier, thanks!

Datasheet AIM 65/40 A65/40-2000 -3000 -4000 -5000
AIM 65-40 System Users Manual
AIM 65/40 Printer Circuit Diagram
AIM 65/40 Circuit Diagram
AIM65 40 Forth Manual
AIM-65 Forth Supplement 65_40





SPS Software Preparation System

Software Preparation System Development

The R6500 Software Preparation System (SPS) is a low cost software development system for the R6500 family, for the 65C02 and 6502 and otehr 6500 family members.
The system can be used with a simple AIM 65 with cassette recorder and dump terminal, to floppy based systems with video display.

SPS and guide ROMs download:

Software Preparation System Development Configurations guide

Z22 SPS100 war im AIM.BIN
Z23 SPS100.BIN
Z25 SPS100.BIN
Z26 SPS100.BIN


AIM 65 magazines