See PDF for additional topics such as:
Upgrading Colour Systems (Glue chip versions)
Further ROM information such as Boot EPROM and version before masked roms were available.
Hand drawn schematics
...
Posted by: Mark - 07-24-2023, 08:51 AM - Forum: Atari ST
- No Replies
Technical Bulletin TN001
Date: 7 January 1986
Subject: 520ST RGB Output
Early models of the 520ST support seperate VSYNC (pin 12) and HSYNC (pin 9) for RGB.
The Thomson colour monitor CM36382 AR requires a combined SYNC input on (pin 20 of the SCART connector). 520ST's manufactured after Nov 85 have been modified to provide combined SYNC on pin 2 of the DIN connector.
These modified 520ST's can be identified by their serial number, as it should start with a 4.
The modification to the 520ST is as follows:
All components should be mounted on component side of PCB in area reserved for UHF modulator.
Posted by: Mark - 07-22-2023, 08:08 AM - Forum: Atari ST
- No Replies
A letter to the dealers from Les Player n the introduction of Technical Bulletins including TN002
1 May 1986
Dear Dealer
I would like to introduce to you the first batch of Technical Bulletins. These will be presented
to you on a monthly basis, included in the Atari monthly News Bulletin. The object of the
Technical Bulletin is to pass onto you technical information that we feel will help you sell and
support Atari Products. The Technical Bulletin will contain bath hardware and software
information.
I would also like to introduce you to the Atari Technical Support Team.
Software Support - Robert Katz
Hardware/Service Support - Knolly Shadrache/Philip Wong Victoria Everitt
General Technical Information - Victoria Everitt
Customer Relations - Lucinda Bell
We would be grateful if you would avoid passing these names to end Users as we are all here
principally for Dealer Support. End User overload results in less capacity to help you.
Should you have any questions please do not hesitate to contact us. Yours sincerely
LesPlayer
Technical Manager
Technical Note: TN002
Subject: TOS ROM UPGRADE
This document should accompany a set of 6 ROMS. These ROMS are identified as follows:
PART NUMBER
These ROMS should be handled with caution.
Before starting an upgrade, ensure that the 520ST is fully operational, then remove all power, video and disc cables.
UPGRADING COLOUR SYSTEMS
Some colour monitors will not have enough adjustment on their vertical and horizontal adjustments to centre the screen. The GLUE IC C025915-38 will now compensate for this. If you do not have this version then you will also need to upgrade your GLUE IC:
There are three versions of the GLUE chip:
Version
1: C025915
2: C025915-20
3: C025915-38
Posted by: Mark - 07-21-2023, 10:28 PM - Forum: Atari ST
- No Replies
Technical Bulletin TN008
Date: 17 April 1986
Re: STM UHF Modulator Adjustment
The UHF TV output may not appear central on some TV sets, slight modulator adjustment should
correct inconsistent positioning.
Proceed as follows:-
1. Only Qualified service personnel should attempt to carry out the following procedure on the
520STFM and 1040STFM as mains voltage exists within these models.
2. Remove plastic cover and R.F. shield
3. Remove modulator shield
4. Apply power and adjust the plastic cross head screw on the modulator PCB until the display is
central.
5. Replace shields and all screws.
As well as producing a modulated output, the STM also provides an un-modulated composite colour
output on pin 2 of its 13-pin Din socket which connects to pin 20 of the Atari Scart Connector.
Posted by: Mark - 07-21-2023, 10:25 PM - Forum: Atari ST
- No Replies
Technical Note: TN006
Date 8 April 1986
Starting up with ROM Based ST's
The following information is aimed at ROM based Atari ST computers , i.e. the Atari 520STm, Atari 1040STf and those Atari
520ST computers with ROMs instal led. To check whether your computer has a ROM based Operating System:
- Set up the ST, Disk Drive and Monitor (or TV) as described in the ST Owners Manual supplied with your computer.
- Turn on the monitor or TV and Disk Drive, ensure that the computer is turned off .
- Insert the Language Disk supplied with your computer into Disk Drive A.
- Turn on the computer, the Disk Drive Busy light will illuminate. If your system is ROM Based , the Desktop as described in the ST owners guide will appear. If you have a computer requiring a disk based Operating System, the computer will display a message prompting you to insert your System Disk.
- If you still have a disk based machine, please contact your Dealer for information on obtaining and installing Operating System ROMs.
Installing Desk Accessories
Desk Accessories are one or more (upto six) programs that reside in your computers memory alongside a main GEM application , such as ST Basic or ST Logo. These Accessories can be accessed at any time and may provide small utilities such as a notepad, diary or calculator. The Language Disk supplied with the Atari 520STm and Atari 1040STf contains two files ending with '.ACC', these files contain four useful utilities , each of these being described in detail in the ST Owners Manual.
Posted by: Mark - 07-21-2023, 03:26 PM - Forum: Atari ST
- No Replies
Technical Note: TN003
Dismantling ST Products
Technical Note: TN003
Subject: DISMANTLING ST PRODUCTS
Users should be aware that screws of two different lengths are used to secure the plastic cover to the base of the 520 and 1040 design computers. The three longest screws are nearest the back and should not be used at the front since they will penetrate the plastic cover and produce visible markings.
