A Tribute to the Dick Smith System 80
(aka Video Genie and PMC-80/81)

Dick Smith System 80 Manuals


1.0 Bundled Manuals
2.0 Technical Manual
3.0 Expansion Unit Manual
4.0 BASIC Programming Manual
5.0 The Dick Smith Easy Guide to Understanding Your Computer


Bundled Manuals

The System 80 sold with three user manuals. These were A4 size, but printed in landscape orientation.

1. The Users Manual

System 80 User ManualThe user manual was a sparse 16 pages in size. It dealt with basic operations like what connects to where, the video display unit, special keyboard and cassette keys, how to load and save a program (no mention on how to load SYSTEM tapes in this section though), how to connect and use a second tape recorder and how to reset the machine.  

Three appendices at the end help some technical specifications, a memory and I/O map and an ASCII table.  

Mr non-threatening System 80The book was illustrated with the character to the right. He/she/it appeared on every page in various poses giving the manual a friendly, folksy feeling. Remember these were the days when computers were not a common household item, and could be considered intimidating by some.  

To see the body of work in full, check out these scanned pages.  For those who want a copy for themselves, download the manual (PDF format 1.95 Mb).  The PDF version is a revision of the original manual and has an extra couple of pages dealing with features of the blue label model.

A second revision of this manual appeared towards the System 80's final months.  Rather than "extra pages" tacked on for the Blue-label features, these were incorporated into the body of the booklet. It also shows arrow keys on the diagrams rather than the Esc/Cntr/Bkspc/Tab keys which featured on Mk 1 models.  Unlike the earlier releases of the manual, the EACA label appears on the back.

Finally, there was a manual for the System 80 MKII business computer which includes the extra features of that machine.

The user manual simply dealt with the mechanics of operating the System 80, relying on the two associated manuals below to teach the user how to get the computer to do what they wanted it to.  

2. The BASIC Manual

Basic ManualThis was the largest of the manuals at a hefty 88 pages. It dealt with the basics of BASIC, with chapters on active commands, text editing, programming statements, processing arrays, string handling, built-in arithmetic functions and graphic features.

The style was straight no-nonsense prose with an explanation of the command, then a BASIC example to illustrate the point. More a reference manual that a learning guide although it's use was limited for the former due to a lack of an alphabetical keyword index.  A PDF copy is available for download (2.06Mb).

3. Programming for Beginners

Anyone for programming?A short manual (22 pages) which introduced some of the concepts of programming. A useful starting booklet for the completely uninitiated.

As with the two above, a PDF copy is downloadable here (1.97Mb) for those who want to take a peek.



System 80 Technical Manual

Source of all knowledge and wisdomDick Smith released three issues of a Technical Manual for the System 80.  Each issue was larger than the one before.  The second issue contained the hardware information in Issue One plus modifications to make the first-release System 80s more compatible with TRS 80 Model 1 software. 

The 1983 third issue of the Technical Manual, pictured here, (courtesy of Keith Whitehead, Palmerston North, NZ) contained an extended troubleshooting section and the full schematics for every variety of the System 80 plus the peripherals.  There was also a more detailed discussion of the internal signals used in the video circuitry, plus a full explanation of the UART registers in the Serial interface.  

I've included a selection of scanned pages from this Issue below.   They may be of use to technical historians, or those who have come into System 80 ownership through a garage sale etc.  The scans are large full-sized JPGs scanned at 150dpi, and will need to be printed out to be of value.  True masochists can download the whole manual as a 14MB ZIP file.  Please note that in the original manual some of the circuit diagrams were large fold-out ones for greater clarity.  These are reduced in the downloadable PDF file so for those hardware hackers requiring as much detail as possible, downloading and printing out the relevant schematic JPGS in section 4 may be of more value.


1.  Theory of Operation

Subject Relevant page in Issue No. 3 of the manual (Clicking will open a separate browser window)
Preface i
Table of Contents ii
CPU 1, 2, 3
ROM and RAM 4, 5, 6
Video Interface 7, 8, 9, 10, 11, 12, 13, 14, 15
Cassette Interface 16, 17, 18, 19, 20
Keyboard 2122
Power Supply 23
RS232-C Interface 24
Minor Modifications 25, 26, 27, 28, 29
Sys80/TRS80 Differences 30, 31
Video Display Codes 32
Control Codes 33
ASCII Codes 34, 35
Detailed Memory and I/O Map 36, 37
Hex to Decimal Conversion 38

2. Troubleshooting

Introduction 39
Bus Check 40
Flowcharts  
- General Flowchart 41
- Video Interface 42, 43
- System ROM 44
- User RAM 45
- Keyboard 46
- Cassette Interface 47

3.  Troubleshooting Hints

Keyboard malfunctions 49
Video absent or irregular 50
Picture position adjustment 51
Cassette mechanism not working 52
Improving cassette reliability 53
Cassette loading difficulties 54
Screen display "S's and @'s 55
Screen showing garbage 55
Program being corrupted 56

4. Circuit Schematics and Board Layouts

Schematics Boards
CPU Board (all models) CPU Board (all models)
CPU Board - 2 Memory (Early Models)
CPU Board - 2 Memory (Mk II and Blue Label)
Video Interface Card (Early Models) Video Interface Card (Early Models)
Video Interface Card (Blue Label)

Video Interface Card (Later-MkI)
Video Interface Card (Blue Label and MkII)

Cassette Interface (Mk 1)
Cassette Interface (Mk II)
Cassette Recorder

Cassette Recorder

Keyboard and Power Supply
X-4020 Expander Sheet 1

X-4020 Expander

X-4020 Expander Sheet 2
X-4020 Expander Sheet 3
X-4020 Expander Sheet 4
X-4022 RS-232C Communications Port X-4022 RS-232C Communications Port
X-4024 S-100 Interface X-4024 S-100 Interface
X-4010 Expansion Unit Interface Buffers

X-4010 Expansion Unit Interface Buffers

X-4010 Expansion Unit S100 Interface
X-4010 Expansion Unit Address Decoding
X-4010 Expansion Unit Floppy Disk Controller
X-4010 Expansion Unit RS-232C Communications Port
X-4010 Expansion Unit Parallel Printer Port
X-4016 RAM Card X-4016 RAM Card
X-4013 Parallel Printer Interface X-4013 Parallel Printer Interface


System 80 Expansion Unit Manual

The System 80 expansion unit came with it's own manual.  The user manual for the X-4020 version (the second of the two expansion unit models) can be downloaded here.

While the manual was adequate for explaining the extra features provided by the expansion unit and the technical information associated with the extra hardware, it was a little short on the nuts and bolts of exactly how to plug everything together.  New computer users were assisted greatly with this assembly guide

I don't have the technical manual specifically for the X-4020 but Knut Roll-lund has kindly sent me the Video Genie Expander technical manual, which used to reside on his site. As far as I know, the only difference between the Video Genie Expander (EG 3014) and the X-4020 is the name! You can download that manual from here.


System 80 BASIC Programming Manual

Even though the System-80 came bundled with both a BASIC reference manual and an introduction to programming guide, Dick Smith Electronics considered a book which took a more tutorial-style approach was needed.

A husband and wife team was commissioned to produce "Dick Smith's Easy way to program in BASIC using the SYSTEM 80 Computer".  This book, sold separately to the computer, lead the user by the hand through the fundamentals of programming.  Nothing was assumed and concepts that would be considered elementary these days were laboured in fine detail.

As part of System 80 history, this Dick Smith support artifact is worth a mention.  Those interested can download a copy here (15.3Mb - Zipped)



The Dick Smith Easy Guide to Understanding Your Computer

The business system 80 explainedDick Smith was going for the business market.  After a year or so retailing the System 80 Mark I, he now had a swish brand new model from manufactures EACA, the Mark II.  With its numeric keypad, built-in lower case and terminal capability, surely the financial fruits were there for the picking.  Although business-only Z80 CM/P machines (or Apple IIs with a Z80 card) were starting to appear, they were a very high price and lacked a national distribution network and support system.

Problem was, small businesses knew virtually nothing about microcomputers.  What was needed was a crash-course to owners explaining how these machines worked.  Only after they knew what a computer WAS could you convince manager/owners of the indispensable role these electronic wizards could play in The Firm.

Enter "Dick Smith's Easy Guide to Understanding Your Computer".  Actually this is not a bad effort.  A 16 page document covering the basics of both computer hardware and software, using the System 80 MkII as an example (naturally).  It even had a glossary.   Click here for a PDF copy.  


Note: Dick Smith Electronics has kindly given permission for PDF files of this and other manuals to be included on this site.  Copies of these manuals can not be uploaded to another site, or reproduced for commercial gain.  Please respect these conditions.