Dynalogic 4 Manual Full May 2026

To understand the value of the manual, you have to understand the machine. The Dynalogic 4 was brilliant. It ran on a Z80A CPU (4 MHz) but utilized a multi-processor architecture that allowed it to run CP/M and proprietary software simultaneously. It had a built-in modem, a green phosphor monitor, and that gorgeous, rugged, industrial design that screams early 80s "business serious."

But Dynalogic went bankrupt in 1984. Unlike Apple, which printed millions of manuals, Dynalogic printed perhaps a few thousand. Most of those were thrown in dumpsters when offices upgraded to DOS machines in the late 80s.

Today, finding a working D4 is rare. Finding the full documentation? That is a miracle.

The 5" monitor often collapses to a horizontal line. The manual provides the exact resistance values for the vertical deflection circuit (Q401 and Q402). Replace the 2SD313 transistors with modern equivalents listed in the BOM. dynalogic 4 manual full

Unlike single-CPU machines, the Dynalogic 4 contains two independent processors:

| Processor | Role | |-----------|------| | Z80A @ 4 MHz | I/O, disk controller, serial/parallel ports | | 6809 @ 2 MHz | User application space, graphics |

They communicate through a 1 KB dual-port RAM mailbox. To switch modes, press CTRL + F9 (Z80) or CTRL + F10 (6809). Most business software runs on the Z80 (CP/M 2.2). Graphics and real-time tasks run on the 6809 (DynaOS). To understand the value of the manual, you

To understand the manual, you must understand the hardware. The Dynalogic 4 was a "luggable"—a 28-pound suitcase-style computer featuring:

The machine was notable for its integrated carrying handle and rugged steel chassis. However, unlike the Osborne, it was not designed to be cheap; it was aimed at Canadian business professionals who needed portability across Ottawa’s tech corridor.

The legendary bitsavers.org has a section for Canadian minicomputers. Look under pdf/dynalogic. They currently host the schematics for the D4-100 model, which covers the power supply and motherboard logic found in the full manual. To understand the manual, you must understand the hardware

Depending on the year, your Dynalogic likely uses a Schaudt DT 330/335 or a custom Hymer display.

If you stumble across a listing on eBay or a vintage computer forum, you need to know what the genuine article looks like. Beware of photocopied excerpts or user guides from other Dynalogic peripherals (they made a famous 300/1200 baud modem).

A legitimate Dynalogic 4 manual full set will have:

If the manual lacks the diagnostic flowchart section (usually a large fold-out sheet), it is not the "full" version.