weru We offer a complete inventory of Atari ST Computer repair / replacement parts (down to component level, Switches, I.C. Chips, ST Mouse parts, plastics....) as well as complete computers and replacement Motherboards.  Not all of the hundreds of different Atari ST computer replacement parts we carry are listed here.  If you do not see the Atari ST part or items you are looking for see the Best Rev. 10 Catalog or E-Mail us at: bestelec@bestelec.digitalspacemail8.net 

Atari 520ST, 520STFM,1040ST and 1040STE Computers. 68000 Microprocessor with built in 720K disk drive (not on 520ST model), MIDI  serial/parallel ports

Robert F. of NY.   Robert contacted Best via E-Mail.  He was trying to revive his old Atari 520ST (the very 1st 1/2 meg
Atari 16 bit ST computer they ever made) keyboard that was not fully working.  Over several E-Mails back and forth,  Best give Robert some Atari ST trouble shooting tips to try on his ST Keyboard to get if fully working again.  In the end, we had exhausted Roberts trouble shooting ability.  So Robert ordered one of the just about impossible to find in the world, New 1987 Japan made Atari 520ST US Keyboard assembly from Best.   "The keyboard for my 1987 520ST arrived today and works perfectly!  Thank you very much for your assistance."

Boris S. of NV  Boris 1st contacted Best because he was having problems with his 25+ year old original / 1st Gen. Atari 520ST computer with a non Atari made external power supply.  He suspected the problem was with the non made Atari external power supply.  "Thanks for the excellent service! :) I received everything very, very quickly!  I tried the new power supply this weekend. Sadly, my 520ST did not come to life. :(  I'm thinking a component somewhere failed due to the AC power coming from my faulty power supply or my TOS is corrupted. Boo! I'll putter around with it some more in the coming days but I may be reaching out to you regarding another order soon."  On hearing this Best E-Mailed back some Atari ST Tech Tips and things to try on his Atari 520ST computer from our 39+ year Atari Super Tech.  "Great news! I followed your advice to remove and reseat the PLC chips. In fact, I went a little further and checked all socketed chips. My little 520ST booted to a beautiful green desktop! :) :) Your advice was very simple but very helpful and very, very effective. Thank you!!!  But wow ... it's huge! Haha!"

Marlin F. of IN.  Marlin contacted Best looking for a US STE Keyboard for his PAL 1040STE with a Euro / PAL Keyboard he bought in Europe.  He asked questions on the condition of the 1040STE US Keyboards Best had in stock.  "I received my "new" U.S. STE keyboard today, only two days after ordering."  He also ordered one of Best new Atari 4160STE (Atari's official model # for a fully upgraded 4 meg STE computer) Upgrade labels.  "As always, thank you for your excellent service and for all that you've done and continue to do for our little community. It is much appreciated."

Chris D. of NY  Chris placed an Atari order for two ST Computers and 2 Atari SF314 external DSDD Disk Drives for his sons.  "Ordering from Best is like calling up a friend with a time machine and asking him to pick up a few things from 1985!  The STs and drives arrived in perfect condition, and everything look like it just came from the factory!  Shipping speed is like Amazon but with much better packaging. No delivery delights me more than a box from Best with the Atari security tape! My fourth order and definitely not my last!  Thanks so very much!"

Wade R. of SC  Buy his very very low Best Customer number, we can tell Wade has been a Best Atari Customer for over 20+ years now.  Wade contacted Best about 1/2 month ago, looking for a Reconditioned Atari 1040STE computer that he wanted to be upgraded to 4 Meg of memory (Atari's official name / model for that Atari 1040STE computer upgraded to 4 Meg of memory is 4160STE)  At that time we told Wade there was a couple weeks delay / wait on getting an Atari 4160STE Computer for him.  Wade put in an order for one.  "Thanks for the timely delivery of my new 4160STE.  The unit looks simply amazing and works flawlessly - both are attributes I’ve come to expect from Best over the years!  Thanks again for great service and a great product!"

Andrew R. of NY   Andrew contacted Best Electronics because he was looking for an Atari 1040STE computer in prime shape.  Andrew said he was going to use the Atari 1040STE computer a little, but when it was not being used, he planned to put it into a clear show case, as an Atari ST Display / Museum computer.  We suggested to Andrew get one of Best Reconditioned Atari 1040STE computers.  We also told Andrew, we could upgrade his reconditioned 1040STE from 1 Meg of memory up to 4 Megs of memory and upgrade the stock 1040STE TOS operating system to the last TOS Atari made TOS 2.06.  Both 1040STE upgrades Robert went with on his reconditioned Atari 1040STE.  Best also installed one of the official 4160STE labels (Atari official model number for a 4 meg 1040STE computer) on his upgraded STE Computer.  "Just a quick note to say I received the machine in perfect condition (A1 on the packing, this is how it should be done!) and it works great!"

Ashton H. of NC   Ashton's second Atari order from Best, he got a Reconditioned Atari Jaguar CD Player and Reconditioned Atari 1040ST Computer.  "I received the Jag CD and 1040STF. Wow is all I can say they look brand new especially the 1040 next to my old yellowed one I've been using the past few years."

Matt P. of PA  Matt contacted Best Electronics about a half month ago, looking for one of our reconditioned

Atari 1040STE computers.  We explained to Matt, that we did not have any on the shelf ready to ship out. Our 39+ year Atari Super Tech was swapped with more Atari work than he can do 7 days a week here for the last year+ (one of the reasons why we did not have any on the shelf ready to ship out).  We told Matt it would be at least a half month before we could ship him one.  He put one on order. "Brad, arrived from you today one Atari STE. Wonderful!  It is in perfect condition. It's as if I went back in time to buy it. Remarkable. Thank you so much."

Follow up Comment: "Best Electronics are apparently capable of miracles. The Atari STE I bought looked brand new and works like a dream. They also have some amazing items of stock most ST fans wouldn't have dreamed they could acquire 25 years ago - the diagnostic cart, a VGA adapter, the STacy. Highly recommended!"

Atari ST Computers got designed into the hart of an All Data Corp (this system / company was eventually bought out of by Snap On Tool Company) Auto Diagnostic Data system.  This computer system allowed auto mechanics to access thousands of thousands of Automotive service manuals / CD roms on one system.  This Auto data access system was used before the Internet was we know it now was in full use / access.  So at that time, it was a State of the Art auto information system

Atari ST Battle Zone Game.  3 1/2 ST Floppy disk.  Six skill levels, one or two players, one or two Atari Joysticks.  ST Color Monitor recommended, will run on ST Mono display.  DS5020  $19.95

Atari ST Cracked Game.  3 1/2 ST Floppy disk.  Three skill levels, five exciting game scenes, plus Rooster Ranch bonus round, one player with Atari ST Mouse / ST Trackball, ST Color Monitor.  DS5080 $17.95

Atari ST NEOchrome full color paint program.  3 1/2 ST Floppy disk.  82 page manual.  ST Color Monitor and ST Mouse / ST Trackball.  DS5027 $19.95 

Atari HyperPaint ST Graphics Package.  The ST HyperPaint program was developed in the UK (the hot bed of ST developed software), where some of the very best Atari ST Game and Productivity Software was developed for the Atari ST line of computers.  Atari liked this ST Graphics program so much, that they Licensed the ST HyperPaint software from UK Dimitri Koveos Company for sale in the US ST Marketplace.  Load and Save in 4 ST file formats (Neo, Degas - Compressed or Uncompressed or IMG) 130 page manual, two 3 1/2 ST Floppy disks, ST Color Monitor and ST Mouse / ST Trackball.  CB102362 $29.95    HyperPaint II STe compatiable version  CB102362-STE  $35.95

Best ST Software Information Tip:  Once you create a Graphics file using Atari HyperPaint program, you may have a minor problem printing out that graphics file, if you do not have an old Atari ST Laser Printer or old Dot matrix printer.  But there is current real world fix for this minor problem.  If your Atari ST computer has TOS 1.4 (Atari ST TOS 1.4 operating OS / ROMs installed and higher, fixes the bug in the old Atari ST Floppy disk Format program where it only saved a propriety unique ST Floppy disk directory.  Atari ST TOS 1.4 OS and higher, creates duel ST Floppy Disk directories, one propriety ST and one standard PC).  So any ST formatted (not PC formatted) 720K floppy disk with Atari ST TOS 1.4 and higher, can save ST files like the HyperPaint IMG files to 720K floppy disks and have a PC computer read those HyperPaint IMG files.  After that, there are many Free software conversion programs on the Internet (do a simple Internet search), that will convert any IMG graphics file into current JPG file, which can be printed out on any current printer you now own.  So you can also load Neo Graphics file created on the Atari NEOchrome program above into HyperPaint program and save it as a IMG file.

Program Design Techniques for the Atari ST by Paul Overaa.

Paul Overaa has been programming in Basic, C and Assembler for nearly two Decades.  He has worked with hundreds of computers including Atari, Commodore and Apple. In this book he has focused his attention on the Atari ST computer.

Subjects covered include:

• Overview of common program design terminology.

• Detail of the powerful language independent Warnier diagram

• Moving from design to real code

• Secrets of structured programming

• Using Abstract Data Types

• Building "Black Box" programming modules

• The User Interface and other Software Engineering topics

• Hints on Writing "portable" code

• Includes an overview of the new ANSI C Language

• The text contains examples in Basic, ANSI C, and 68K assembly language.

361 page wire spiral bond book  CB102103  $29.95

The Atari STM1 Original Atari ST mouse shipped with the Atari 520ST, 520STFM, 1040STF, 1040STFM computers.  CB101505 $79.95

Best Electronics TrueMouse, Replacement Mouse for the Atari STM1 Stock Mouse.  The TrueMouse has been our bench mark Replacement ST mouse for over 15+ years now.  Thousands of World Wide Atari ST owners have found, once you switch over to a Best ST TrueMouse, you will never go back to the Stock Atari STM1 mouse ever again.  Same over all physical size as the stock Atari STM1 mouse except a slightly lower and more comfortable profile with a back end of the mouse which is round in shape Not square with sharp corners!, Extra Wide Left and Wide Right mouse switch covers similar to the stock Atari mouse so it will fit all size hands and also has a tactical raised lip between the Left and Right switch covers, Extremely Positive Feeling Industrial Grade Micro / Mouse switches which are rated at a minimum of 1,000,000 operations per switch with only 120 grams operating force, Tracking resolution of 200 DPI, Opto-Mechanical Encoder Design, 5 1/2 Foot mouse cord, replacement TrueMouse parts available from Best and FCC Class B Approved. CB102079 $49.95

Dewey K. of WI  Dewey ordered a new Best Mega 2 replacement Keyboard cable to replace the used one that was in bad shape on his just received Atari Mega 2 computer.  He also ordered a new Best ST True mouse.  "WOW!!  I am very happy with the service I have received. You answered my questions, helped me through the ordering process, and shipped my order quickly.  The keyboard cable is a great replacement for the old one.  I really like the TrueMouse.  It’ much better than the Atari mouse!"

Atari STM1 Rebuild Kit.  Rebuild your order worn out Atari STM1 mouse and keep it as a back up ST mouse.  Kit includes, a new Atari OEM STM1 Mouse cable, two new Internal Atari Mouse switches, four better than stock Best's thicker STM1 Mouse new Teflon replacement feet and new a mouse ball.  Over the years Atari had about 5 to 7 different manufactures make the same STM1 mouse for them.   Each version mouse looks the same from the outside but differs on the inside and bottom locking plate construction.  All STM1 rebuild kits require ability to unsolder and solder in the replacement new mouse switches and one case the cable too.  To configure the correct Atari STM1 Rebuild kit for your exact version old STM1 mouse.  We need the following questions answered from you:

1.  Where your STM1 mouse was made (one version, does not have a country listed).  Usually listed on bottom label?

2.  Do you have slide and snap in or Round twist and lock mouse ball locking plate?

3.  Do you have Steel, Brass or Plastic internal Ball contact rollers?

4.  Size of your STM1 Mouse ball, 22 mm (3/4 inch) or 25 mm (1 inch) Diameter?

5.  Size of your SMT1 Mouse Internal Switches, 1/4 or 3/8 inch square?

6.  Internal STM1 Mouse cable female (and the Male mating) connector Color, Tan, White, Black or in one case wires soldered directly to the STM1 mouse PCB board?

Best STM1 Rebuild Kit.  CB101398  $26.95

Also in stock for the Atari STM1 mouse, Bottom Mouse Ball Locking plates, Internal sets of Photo Optics (matched set of 8) and SMT or Dip version LM339 I.C.

Best's STM1 Mouse new Teflon replacement feet with adhesive backing.  These Best designed and produced upgraded Atari STM1 replacement mouse feet (very light off white to light blue color), have a Teflon pad thickness about twice as thick, compared to the Stock made Atari STM1 OEM mouse feet.  In theory should last twice as long as the Original STM1 mouse feet.  CB101114  $5.00  per set of 4 feet

"TT" Touch "The Best" upgrade for the 520STFM / 1040STF / 1040STE / Falcon 030 Keyboards By Best Electronics. Improved High Grade Replacement Internal Silicone contacts firms up and gives you a Tactile bounce back on each 520STFM / 1040STF / 1040STE Keycap. Upgrades your Mushy 520STFM / 1040STF / 1040STE keyboard to the Atari TT / High grade P.C. type key board standards, an amazing difference compared to the stock ST / STE Keyboards. A must for ever Touch Typist! Set of 95 contacts for all world wide 520STFM / 1040STF / 1040STE version Keyboards, only a #0 Phillips screw driver required for installation! CB101980  Sold Out

2^nd Generation "TT" Touch "The Best" upgrade for the 520STFM / 1040STF / 1040STE / Falcon 030 Keyboards By Best Electronics.  Improved High Grade Replacement Internal Silicone contacts now have the current State of the Art Keyboard technology half stroke keycap travel / movement and good tactical feed back when the ST key cap is released.  Upgrades your Mushy / Spongy 520STFM / 1040STF / 1040STE / Falcon stock keyboard key cap functions to the Atari TT / High grade P.C. / Laptop type keyboard standards.  A night and day difference between ST / STE / Falcon Keyboards.  Also the newer larger diameter textured conductive dome contact dot, will allow some non working ST cap functions to start to work again.  Best will include an extra 1st Gen. TT touch day glow orange dome contact, so you will have option for a half height or full travel space bar function.  Set of 95 contacts for all world wide Atari 520STFM / 1040STF / 1040STE / Falcon version Keyboards, only a #0 Phillips screw driver required for installation!  CB101980-2nd  $36.95  

Read the 5+ month story behind the 2nd Generation "TT" Touch Keyboard upgrade internal contacts and how they almost did not happen.

Karoly B. of Germany.  "A while back, I ordered 3 TT Touch sets from you. They arrived fine and all work great in my ST, STE, and a Falcon.  As a satisfied customer, now I'm back, ordering more Atari things from your shop."  This Atari order Karoly ordered 1, 2nd Gen. Best TT Touch ST / STE / Falcon keyboard internal upgraded contacts and 2, 2nd Gen. Best XE Touch XE / XEGS internal keyboard upgrade contacts.  It is extremely rare to get any Atari feed back comments from any of our German Atari users.  In the last 40+ years in the Atari business, this may be our 9th or 10th feed back comment from Germany !

Erhard P. of Germany   It is extremely rare to get an Atari German user feed back comment an any of Best Atari products.  Over the last 39+ years in the Atari Business, we have had a total of 8 German Atari comments back.  Erhard ordered a set of Best ST / Falcon Keyboard TT Touch internal Silicon upgrade contacts.  "I immediately opened one of my ugly-touch-keyboards and replaced the greenish silicone things with the new ones from BEST and reassembled the keyboard.  I must say that I got more than I had expected: pushing the keyboard keys now requires a bit more pressure, but I am extremely happy with that pushing-point-feedback" (Tactical bounce / feed  back when the ST key cap is pushed down and released). "In addition the computer now recognizes every key press which was not the case before"  Old worn out / bad ST / Falcon keyboard Silicon dome contact conductive internal dot contacts.

Asan T. of the UK  Asan must of read a review on the Best exclusive TT Touch internal ST - Falcon keyboard upgrade Silicon cups.  He ordered 3 set of them.  "Just to let you know that these have arrived safely here and I've just fitted them.  Oh my goodness, these are absolutely amazing! They completely transform the feel of the keyboard and my only regret is that I didn't experience the benefit of these 30 years ago!  Thank you so much and best wishes"

Anders G. of Sweden   Anders ordered some new Atari TT Custom replacement chips and the Best Exclusive TT Touch internal keyboard  Silicon replacement upgrade / enhancement contacts for Atari ST / STE / Falcon computers.  "I just wanted to write and thank you for the TT-Touch keyboard upgrade! It made a huge improvement over the stock 520STM keyboard and I’m very happy with it."

Follow up Comment:  "I have to say that over the years I thought I'd forgotten how to touch type.  With the TT Upgrade, no spell check, no autocorrect (and a little bit of practice) I'll be back to 75WPM quite quickly!  Much better than any keyboard I can buy today!"

Richard K. of the UK  Richard has placed 2 back to back International Atari orders with Best.  He is ready to place his 3rd Atari order.  "I fitted your Best TT touch Falcon Keyboard Upgrade contacts to my Atari Falcon - what a fantastic transformation!!  In fact so good I'd like to purchase two more kits for my Atari ST's."

Matt M. of WA  On placing his 3rd in a row Atari order for the month of May with Best Electronics, Matt wanted to order the Mega Touch ST Keyboard Key Cap springs that stiffen up the mushy ST keyboard key caps.  Best recommended that he would be much better off getting the Best TT Touch 1040STE Keyboard internal Silicon upgrade cups.  "Installed those rubber cups on my STE’s keyboard this morning — BIG improvement! Thanks!"

Brian R. of KS  "Got the TT-touch installed yesterday and they work wonderfully!!"

Jason F. of UT  Jason purchased Best Electronics TT Touch internal silicon cups that upgrade Atari 520ST, 520STFM, 1040ST, 1040STE and Falcon Atari Computer Keyboards.  The easy to install TT Touch product will remove the ST / Falcon Mushy Key caps and end up with a high grade tactical feedback PC feeling Atari ST keyboard  "I have to say the TT Touch I installed into my Falcon is premium work, I can tolerate typing on it now! Certainly, definitely a worthy product to back"

Atari 520ST/1040ST English Owners Manual CB101485 $12.00

1040STE / 4160STE English version Owners Manual with Addendum.  Includes ST Owners Manual. (CB101485) and STE Addendum. CB101873  $12.00

520STE / 1040STE / 4160STE    Clear Keyboard Protector / Overlay  For your STE keyboard. This clear, flexible skin covers the keys of your keyboard but lets you See and Type through it. Used to protect your STE keyboard from dust, liquids, metals and other small items that could fall into your keyboard and damage it. CB102419  E-Mail us at bestelec@bestelec.digitalspacemail8.net 

Megamater Cable for the 520STFM, 1040ST, 1040STE / 4160STE This short inexpensive cable assembly (8 pin connector to 6 pin Phone jack) allows you to interface a complete Mega free standing Keyboard assembly (Best part # CB101513 keyboard + CB101539 keyboard cable) to your STFM / STE computer. All you have to do is unplug your STFM / STE internal keyboard connector, plug in Megamater cable and snake the 6 pin receptacle end of the cable out through the joystick port. For Best results, the right side top or bottom half of the STFM / STE / Falcon case should be notched for the 6 pin connector housing for best strain relief! Now you will have an Atari lap keyboard with full Keyboard / Mouse / Joystick functions! CB101909  $15.95

Atari ST Diagnostics

Atari 520ST Service MANUAL

All world wide versions 60 Pages. Sections covered: Theory of Operation/ Case Design/ Architecture/ Main System/ Graphics Subsystem / Music System / Device Subsystems/System Timing Diagram System Block Diagram, Schematics and Silk-screen,Testing/Overview-Test Equipment-Power Up Test ST Diagnostic Cartridge-Error Code List, Disassembly/ Assembly/Top Cover/ Keyboard Removal-Bottom Cover Removal-Shield Removal/ Reassemble, Symptom Checklist-Display Problems -Drive Interface Problems-MIDI Problems-Printer Port Problems-Keyboard/Mouse Problems/ Error Code Quick Reference, Diagnostic Flowcharts/Swap out Procedures/ Handling of Integrated Circuits-Power up Test-Black screen-White Screen-Scrambled Screen, Parts List and Updates.   CO26118  $32.00

Atari Service Manual 520ST / 520STFM / 1040STF Computers For all world wide 32 Ram Chip versions. 80 Pages. Sections covered: Introduction Case Design-Power Supply, Theory of Operation-Main System-Audio/Video subsystem Input/Output subsystems-System Startup System Errors-Functional Block Diagram-System clock diagram, Testing Overview/Test equipment Test Configuration -Troubleshooting a dead unit Diagnostic-Cartridge -Error Codes-Test Harness Hook-up Diagram, Disassembly / Assembly-1040 Disassembly 1040 Assembly 520 Disassembly 520 Assembly, Symptom Checklist, Diagnostic Flowcharts, Parts list and Assembly Drawings, Schematics and Silk-screen and Glossary.  CB101474  $54.95

Sams Computer facts  Service Manual for 520STNTSC/U.S. version computer, 520ST external U.S. 110 Volt power supply (only one version), Goldstar SM124 U.S. version Monochrome monitor and Epson SF354 disk drive. Sections covered: Block Diagram, Disassembly Instructions, General Operating Instructions, Grid Trace Location Guide Main Board-Power Supply, I.C. Pinouts and Terminal Guides, Line Definitions, Logic, Parts List, Photos Keyboard-Main Board-Power Supply Board, Safety Precautions, Schematics- Keyboard-Main Board-Power Supply, Schematic Notes, Test Equipment and Troubleshooting. 89 pages. CB101098  $49.00

1040STE / 4160STE Atari Field Service Manual  For all world wide versions. Sections covered, Introduction: Overview-Main Components-Case Design-Power Supply-Negative Supplies, Theory of Operation: Overview-Main System-Audio/Video Subsystem-Input/Output Subsystems-Microprocessing Unit-GSTMCU-Main Memory-Direct Memory Access-Multi-function Peripheral Control-Audio/Visual Subsystem-Digitized Sound-Genlock and the STe-Input/Output Systems-System Startup-System Errors, Testing: Overview-Test Configuration-Troubleshooting a dead Unit-520STE / 1040STE Diagnostic Cartridge-Power Up Sequence-Test Menu-RAM Test-ROM Test-Color Test-Keyboard Test-Midi Tests-RS232 Tests-Audio Test-Timing Test-DMA Tests-Floppy Disk Tests-Printer and Joystick Port Tests-Monochrome Monitor-Hard Disk Write/Read-Graphics Chip Blit-Error Codes Quick Reference, Disassembly /Assembly:520STE/1040STE Disassembly-520STE/1040STE Assembly, Symptom Checklist: Display Problems-Disk Drive Problems-Keyboard Problems-Midi Problems-RS232 Problems-Printer Port Problems-Hard Disk Port Problems and DMA Sound, Diagnostic Flowcharts: Replacement Procedures-Handing of Integrated Circuits, Parts List, Glossary and Schematics and PCB Silk-screen.. 94 pages with 8 pages of Atari Schematics. CB101626  $50.00

ST / Mega 4.3 Rev. Diagnostic Cartridge18+ Diagnostic Tests. Ram, ROM, Color, Keyboard, Midi (requires loop back cable), Serial Port (requires shorting connector), Audio, Timing, DMA Port (requires Loop back board and cable), Printer / Joy Ports (requires joy loop back + Printer cables with Loop back board) High Resolution (requires SM124 / SM125 /SM147), Short Blitter, Long Blitter, Real Time Clock, Hard Disk Read /Write Test with Park feature, Expansion Connector (Mega), Examine / Modify Memory, Set RS232 Rate, 50 / 60 Hz Video output Toggle, Internal tests burn in tests, All Tests Burn in cycle, Floppy Disk Tests including Test Disk Speed, Quick Test, Install Disk drives, Check 80 - 82 Copy Protect Tracks, Read Alignment Disk, Disk Interchange Test, Disk Exerciser Tests, this ST Diagnostic Cartridge also checks for current Keyboard I.C. Rev., TOS O.S. Version and Total ST Memory present during boot up. Cartridge and small manual.  CB101615 $39.95

Atari 520ST, 1040ST, Mega 1/2/4, Stacy, 1040STE, MegaSTE, TT and Falcon Computer Diagnostic Loop Test Hardware Test Kit 

When Atari set up a new US Atari ST Service Center Dealer, as part of the ST Dealer Service Center package (full set of ST Computer repair Manuals, ST Color and Monochrome Monitor manuals, 520ST/1040ST Diagnostic Cartridge), a new complete 520ST, (later) 520STFM and 1040ST Computers for parts) and this loop back ST Test kit.  The new Atari ST Dealer paid for ($,$$$+) for this complete Atari Service Center Hardware Package.  

This Atari ST Loop back test hardware is used with the many different Atari ST different Diagnostic Cartridges (520ST/1040ST/Mega, Stacy, 1040STE, MegaSTE, TT or Falcon Diagnostic Cartridges) to fully test all ST computer Internal and External hardware functions.  Extra port shorting hardware / plugs required for the 1040STE, MegaSTE, TT and Falcon computers to full run all of the extra Diagnostic Tests / Ports (extra features or different style ports of those model Atari computers). 

The two DB-9 black Joystick cables are connected up to the ST Joystick/Mouse ports and back to the Loopback green PCB (most ST computers require you to crisis cross (not one to one) these DB-9 shorting cables back to the loop back PCB to get the proper port diagnostic results).  The short black or gray DB-25 Parallel cable is connected to the ST printer port and loop backboard.  The short gray ST DB-19 DMA cable is connected to the ST DMA port and the loop backboard.  The 5 pin Din shorting cable is connected up to both ST Midi Ports (one end of this Midi cable has a Red LED molded into the translucent connector housing to see the Diagnostic Midi Send and Receive sent signals).  The DB-25 Serial port shorting connector is connected to the ST Modem / RS232 external Port.

Depending on the exact version Atari ST Diagnostic Cartridge used with the ST loop back hardware test board, you can choose from the ST Diagnostic display menu to run between different ST Diagnostic tests one at a time or our 27+ year Atari Super Tech’s standard 12 to 24+ hour continues Burn in loop that he tests all ST computers with.  Typical Atari ST Diagnostic tests you can run using the different Atari ST Diagnostic Cartridges and Loop back external Hardware, upon boot up displays ST TOS Rev., Total ST / TT Fast Ram, Keyboard I.C. Rev. level., 5 ST Ram Tests, 7 ST internal Chip set timing Tests, if present 14 Blitter chip tests, if present 2 Real Time Clock tests, Audio tests, OS ROM Test, 2 Printer Port I/O Tests, Color and Monochrome ST display tests, 3 Keyboard tests, 5 Mouse and Joystick port tests, 12 RS232 / Serial / Modem I/O port tests, 50 / 60 Hz display toggle, 17 Internal or External Floppy Disk Drives tests, 4 DMA I/O port Tests, 2 Parallel port I/O tests, 5 Midi Send and Receive Tests.  The best way to fully test and burn in any unknown condition or repaired Atari ST computer. 

Atari ST Loopback board, cables and shorting connector Kit.  CB102271 $59.00 

Atari Tech Tip on the Loopback ST PCB board.  Our Atari Super Tech strongly recommends you tape the anti Static pink bubble bag the Loopback board comes in (or tape a piece of thick and oversized piece of cardboard) to the exposed back side / solder side of the Loopback PCB board, to prevent it from shorting out / damaging the different I.C.’s on the top side of Loop back PCB should the back side of the exposed PCB come in contact with any metal.

ST / Mega 3.61 Rev. Diagnostic Cartridge This ST Diagnostic Cartridge is an earlier version of the above ST Diagnostic cartridge. 12+ Diagnostic Tests. Ram, ROM / O.S., Color, Keyboard, Midi (requires loopback cable), Serial Port (requires shorting connector), Audio, Timing, DMA Port (requires Loop back board and cable), Printer / Joy Ports (requires joy loop back + Printer cables with Loopback board) High Resolution (requires SM124 / SM125 / SM147), Examine / Modify Memory, Set RS232 Rate, 50 / 60 Hz Video output Toggle, Internal tests burn in tests, All Tests Burn in cycle, Floppy Disk Tests including Test Disk Speed, Quick Test, Install Disk drives, Check 80 - 82 Copy Protect Tracks, Read Alignment Disk, Disk Interchange Test, Disk Exerciser Tests, this ST Diagnostic Cartridge also checks for current Keyboard I.C. Rev., TOS O.S. Version, 50 or 60 Hz operation and Total ST Memory present during boot up. Cartridge no manual.  CB102811 $24.95

520STE / 1040STE / 4160STE Rev.1.9 Diagnostic Cartridge  17+ Diagnostic Tests. Ram, ROM, Color, Keyboard, Midi (requires loop back cable), Serial Port (requires shorting connector), Audio, Timing, DMA Ports (requires Loop back board and cable), Printer / Joy Ports (requires joy loop back + Printer cables with Loop back board) (Analog Joystick port test, requires an Available Atari external STe test board and cables) High Resolution (requires SM124 / SM125 / SM147), Short Blitter, Long Blitter, Hard Disk Read / Write Test with Park feature, Expansion Connector (Mega), Examine / Modify Memory, Set RS232 Rate, 50 / 60 Hz Video output Toggle, Internal tests burn in tests, All Tests Burn in cycle, Floppy Disk Tests including Test Disk Speed, Quick Test, Install Disk drives, Check 80 - 82 Copy Protect Tracks, Read Alignment Disk, Disk Interchange Test, Disk Exerciser Tests also checks for current Keyboard I.C. Rev., TOS O.S. Version, 50 or 60 Hz operation and Total ST Memory present.  CB102032  $50.00

520STE / 1040STE / 4160STE    Rev. 1.4 Diagnostic Cartridge
This is an earlier Atari Factory / Manufacturing version of the above Atari Service Center STe Diagnostic Cartridge. This cartridge was used by the Atari factory to in-house test STE Computers during the Assembly Process! This 1.4 version STE Diagnostic Cartridge tests the following, Video, Audio, Midi (requires loop back cable), Serial Port (requires shorting connector), DMA Port (requires Loop back board and cable), Blitter, Floppy, ROM, Ram, Printer and Joystick Ports (requires joy loop back + Printer cables with Loop back board), Monochrome, Keyboard, Timing, Examine / Modify Memory, Set RS232 Rate, 50 / 60 Hz Video output Toggle also checks for current Keyboard I.C. Rev., TOS O.S. Version, 50 or 60 Hz operation and Total ST Memory present. CB102709  $39.95 

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