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Compute! and Compute II

Compute!

A magazine devoted mostly to 6502 computers.
Apart from the Compute II period,
before and afterwards also the small SBCs like
KIM-1, AIM 65 and SYM1 got attention of Compute!
High quality scans of Compute first years
with the SBC section, issue 1, 2, 3 and 7 to 19
, alas with a watermark.
Nearly all of Compute! lives here in html format.
The Internet archive has many issues without a watermark

Compute II

Compute II was a short lived split-off of Compute! and also a continuation of the KIM-1/6502 User Notes. Three issues and it was merged back with Compute! again.

HTML version of Issue 1
PDF of Compute II Issue 1
HTML version of Issue 2
PDF of Compute II Issue 2
HTML version of Issue 3
PDF of Compute II Issue 3

Selected articles on KIM-1, AIM 65 and SYM-1 and 6502 in general

Articles by Marvin L. de Jong

Interfacing the AM9511
and various floating point subroutines

Compute! 7, 9, 11, 13, 17
Computer Communications Experiments
Compute! 10
Experimenting With The 6551 ACIA
Compute! 10
Improved Pulse Counting Software For The 6522
Compute! 1
Machine Language Versus Basic Prime Number Generation
Compute! Issue 2
The book by Marvin L. de Jong
Programming and Interfacing the 6502 with Experiments

Articles on 6502, KIM-1, AIM 65, SYM-1

Expanding KIM style 6502 SBC
3 part article in Compute 1981 January to March on the MTU bus
Dungeons And Dragons Dice Simulator For The KIM-1
See also the program running on a KIM-1.
A KIM-1 file in Microsoft Basic
A Terminal for KAOS (KIM AIM, OSI, SYM)
A Vocal HEX Dump for the KIM-1
AIM 65 Floating-Point Arithmetic From Machine Language
Placcating a Rebellious KIM Without Sacrificing RAM
SYM (AIM) Hi Speed Tape Revisited
AIM 65 Tape Copy Utility
AIM User Input And Output
An Efficient AD Interface
Cassette IO with AIM 65 BASiC
BASIC Memory Map KIM AIM SYM PET APPL
Combining BASIC And Machine Language Programs On Tape
Communication
Dissecting C.W. Moser’s ASSMTED 1.0
DLOAD AIM Memory Loader
Hex Conversion
KIM Tidbits Expanding The System
KIM-1 Tidbits BASIC input
Load And Save KIM Basic Programs on Your SYM
Nuts and Volts 6 Centronics via 6522
Nuts And Volts 6502 Read and Write Timing
Read PET Tapes With Your AIM
Real Time Clock Subroutine
SYMple Clock
Test RAM for bad bits Nondestructivily
The Practical Aspects of Assembly Language Programming Part 1 and 2
The Practical Side of Assembly Language
The Single-Board 6502 The KIM-4 Bus
The Single-Board 6502 High Speed Data transfer
The Wonderful Wedge
Track Down Those Memory Bugs
Using The 6522 to drive a Printer
The Carry Bit What it is And How it works

Vorstellung: The 6502 50th Anniversary Computer Badge (1975-2025)

The 6502 50th Anniversary Computer Badge (1975-2025), variant of Lee Hart’s 6502 badge, to celebrate the 6502 birthday.

On the German forum64.de

#50birthday6502

January 2026, the 50th birthday of the KIM-1

n 1975 MOS Technology started delivery of 65XX ICs. So 2025 marks the 50 year anniversary of the 6502!
The earliest mentions of the KIM-1 are from January 1976. The date of the first edition of the User Manual, and first mentions in e.g. Byte.
So I propose to declare January 2026 as the 50th birthday of the KIM-1!
#50yearsKIM1

How to use the time in the 6530/6532

When I acquired a KIM-1 Rev A, obviously sold by NCE/Compumart, it came with some documentation that may interest any programmer working with the MOS Technology (R)RIOT 6530 and 6532.

The timer description the datasheet is a bit vague about how to use. What may help is the document ‘KIM-1 Application Note 2 Interval Timer Operation’ by MOS Technology.

A document with listings of KIM-1 programs called ‘KIM-1 Application Programs CT1’ illustrate the usage of the timer in interrupt mode. You find the documents here:
Compumart KIM-1 Rev A – Retro Computing

PLEASE package The Computerist

PLEASE is a very small package for a standard KIM-1. It has a tiny monitor, command interpreter and many handy subroutines.

PLEASE INSTRUCTIONS
PLEASE LISTING

A small book with five experiments with the KIM-1

A small book with five experiments with the KIM-1.
1. User
2. Input/output
3. I/O controller
4. Timing
5. Hardware interrupts

KIM-1 experiments)

MOS Technology KIM-1 Preliminary datasheet 1976

With one of my KIM-1s (a Rev G) came a MOS Technology KIM-1 Preliminary datasheet 1976.

Added to the KIM-1 manuals page.


Facebook, not now

I am administrator of several Facebook groups. But not at the moment. So if you came here looking why I am absent on Facebook starting August 22, read this: I am well, my Facebook account is not.

I am not a fan of Meta and the way they treat privacy, so I do not post any personal info there anymore and unfriended nearly all.
Meta also started to target personal advertisement in a more aggressive way, even blocking access for a couple of seconds on the phone to force me to accept that.
I stopped therefore a long time ago posting personal information.

But these groups are retro computing related, with a nice atmosphere and many members, of which I am the administrator and a major contributor:
– KIM-1, SYM-1, AIM 65, Elektor Junior and clones (over 1000 members)
– 6502 CPU family (over 4000 members)
– The School of Wirth (a dozen members)

Out of the blue Facebook blocked my access on August 22, I have not obeyed their ‘community rules’. Must be because I link to my websites a lot. Facebook hates people going offsite!

At the moment I am not allowed back in, I have appealed and wait for Facebook. It could mean permanent blocking and the groups will suffer.
There are backup admins, so they may survive.

If I am permanently blocked, my regards and good wishes to all members of the groups I administer!

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All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

I got hold a about 10 cm of MTU documents. Several I already had in PDF format, some not available yet.
I took the opportunity to scan/rescan/repair what I have online until now.
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

Noteworthy are the new revised K-1008 September 1979 document and the now complete and revised K-1013 manuals and 2 versions of the CODOS V1 manual.
All the K-1002 documents, for KIM-1, SYM-1, AIM 65 and Commodore PET are new.

Micro Technology Unlimited – Retro ComputingMTU history: Hal Chamberlin
MTU Catalogs, Product Descriptions and Newsletters
MTU Application notes
MTU K-1000 power unit
MTU K-1002 Audio D/A Converter
MTU K-1005 Card File and Motherboard using KIM/MTU bus
MTU K-1007 PET MTU bus interface
MTU K-1008 Visable Memory
MTU K-1008 documents
Dave Plummer has a K-1008
The K-1008 and the KIM-1 Simulator
Graphics Software Package K-1008
K-1008 Test programs
K-1008-2L Patches to Microsoft BASIC
K-1008 Visable Memory Replica by Eduardo Casino
MTU K-1009-1C AIM 65 Printer Enhancement Package
K-1012 PROM expansion board
K-1013 floppy controller
MTU CODOS
MTU K-1016 16K RAM board
MTU K-1020 Prototyping board
MTU K-1032 Banker RAM ROM I/O

Compumart KIM-1 documents

When I acquired a KIM-1 Rev A it came with some documentation revealing its provenance:

Warranty card
Brochure showing the Rev A
A document with KIM-1 program called KIM-1 Application CT1
KIM-1 Application Note 2 Interval Timer Operation