Task: Repair an Atari 800XL That Does Not Boot Cartridges by Replacing the GTIA Chip Needed: Working GTIA Chip, Atari 800XL, Screwdriver, Chip Lifter Time: About 1 Hour or Less Introduction I acquired a non-working Atari 800XL in 2025 that would boot to a black
Read moreDiagnose and Repair a Faulty Non-Maskable Interrupt (NMI) Signal on an Atari 8-Bit Computer (1-2 hrs)
Task: Diagnose and Repair a Faulty Non-Maskable Interrupt (NMI) Signal on an Atari 8-Bit Computer Needed: Oscilloscope, Multimeter, Soldering Iron, Desoldering Iron, Hot Air Rework Station Time: 1-2 hours Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying purchases. Introduction
Read moreDiagnose and Repair the Crystal Clock Oscillator Circuit in an Atari 8-Bit Computer (1-2 hrs)
Task: Diagnose and Repair the Clock Oscillator Circuit in an Atari 8-Bit Computer Needed: oscilloscope, clock circuit components, soldering iron, desoldering iron, hot air rework station Time: 1-2 hours Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying purchases. Introduction
Read moreWatch My YouTube Video on the Diagnosis, Repair, and Modification of Vintage Computers (45 mins)
Task: Watch My YouTube Video on the Diagnosis, Repair, and Modification of Vintage Computers Needed: Web browser Time: 45 minutes Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying purchases. Introduction I prepared a presentation on the diagnosis, repair, and
Read moreUse a Multichannel Oscilloscope to Test Multiple Pins of an Integrated Circuit Simultaneously (15-30 mins)
Task: Use a Multichannel Oscilloscope to Test Multiple Pins of an Integrated Circuit Simultaneously Needed: Multichannel Oscilloscope with Multiple Probes Time: 15-30 mins Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying purchases. Introduction I have previously posted about using
Read moreLabel the 6502 CPU, ANTIC, GTIA, POKEY, and PIA Chips for Easier Troubleshooting Using a Multimeter or Oscilloscope (10-15 mins)
Task: Label the 6502 CPU, ANTIC, GTIA, POKEY, and PIA Chips for Easier Troubleshooting Using a Multimeter or Oscilloscope Needed: Printed Pinouts and Double-Sided Tape Time: 10-15 mins Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying purchases. Introduction I
Read moreReplace the Track 0 Sensor on an Indus GT Floppy Disk Drive for the Atari 8-Bit Computers (30-60 mins)
Task: Replace the Track 0 Sensor on an Indus GT Floppy Disk Drive for the Atari 8-Bit Computers Needed: Web browser, Indus GT, Track 0 Sensor, Soldering Iron Time: 30-60 minutes Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying
Read morePurchase the Sys-Check Device for Diagnostic Testing of the RAM and ROM of Atari XL/XE 8-Bit Computers (5-10 mins)
Task: Purchase the Sys-Check Device for Diagnostic Testing of the RAM and ROM of Atari XL/XE 8-Bit Computers Needed: Sys-Check, Atari 8-Bit Computer with PBI Slot Time: 5-10 mins Disclosure: Note that as an eBay Partner Network Affiliate, I may earn from qualifying purchases. Introduction
Read moreFix an Atari 8-Bit Computer Keyboard by Replacing the Mylar Membrane (15-30 mins)
Task: Fix an Atari 8-Bit Computer Keyboard by Replacing the Mylar Membrane Needed: Screwdriver, mylar membrane Time: 15-30 mins Introduction There were a variety of keyboard styles and technologies that were used in the entire Atari 8-bit line of computers. Some are mechanical and some
Read morePurchase an ESD Soldering Mat to Prevent Electrostatic Discharge While Repairing Atari 8-Bit Computer Circuit Boards (5-10 mins)
Task: Purchase an ESD Soldering Mat to Prevent Electrostatic Discharge While Repairing Atari 8-Bit Computer Circuit Boards Needed: Web browser Time: 5-10 minutes Introduction When I started doing repairs and mods on Atari 8-bit computers I purchased a silicon soldering mat (see first photo below)
Read moreTroubleshoot the 6502 Processor on Your Atari 8-Bit Computer Circuit Board Using an Oscilloscope (15-30 mins)
Task: Troubleshoot the 6502 Processor on Your Atari 8-Bit Computer Circuit Board Using an Oscilloscope Needed: Atari 8-bit computer, oscilloscope Time: 15-30 minutes Introduction Nothing is more frustrating than a beloved Atari 8-bit computer that isn’t booting properly into Memo Pad on the 400/800 or
Read moreReplace Faulty RAM on Your Atari 8-Bit Computer Circuit Board (30-60 mins)
Task: Replace Faulty RAM on Your Atari 8-Bit Computer Circuit Board Needed: New DRAM and perhaps sockets, desoldering iron, hot air rework station, soldering iron and solder Time: 30-60 minutes Introduction I recently received two nonworking Atari 800XLs that would boot straight to the RAM
Read moreReplace Faulty Capacitors on Your Atari 8-Bit Computer Circuit Board (30-60 mins)
Task: Replace Faulty Capacitors on Your Atari 8-Bit Computer Circuit Board Needed: New capacitors, desoldering iron, hot air rework station, soldering iron and solder Time: 30-60 minutes Introduction Electrolytic capacitors are notoriously unreliable on retrocomputers. The capacitors used in 1970s and early 1980s on the
Read morePurchase Sockets to Make it Easy to Seat Chips on Atari 8-Bit Computer Circuit Boards (5-10 mins)
Task: Purchase Sockets to Make it Easy to Seat Chips on Atari 8-Bit Computer Circuit Boards Needed: Web Browser Time: 5-10 minutes Introduction I have been posting about tools and technology that can be used to assist with the repair of non-working Atari 8-bit computers.
Read morePurchase Contact Cleaner for Reseating Chips and Cleaning Contacts on Atari 8-Bit Computer Circuit Boards (5-10 mins)
Task: Purchase Contact Cleaner for Reseating Chips and Cleaning Contacts on Atari 8-Bit Computer Circuit Boards Needed: Contact Cleaner Time: 5-10 minutes Introduction I have been posting about tools and technology that can be used to assist with the repair of non-working Atari 8-bit computers.
Read morePurchase a Hot Air Rework Station for Removing Bad Chips from Atari 8-Bit Computer Circuit Boards (30-60 mins)
Task: Purchase a Hot Air Rework Station for Removing Bad Chips from Atari 8-Bit Computer Circuit Boards Needed: Desoldering Iron, Circuit Board, Hot Air Rework Station Time: 30-60 minutes Introduction I previously posted about purchasing and using a desoldering iron to remove bad chips from
Read morePurchase a Desoldering Iron for Removing Bad Chips from Atari 8-Bit Computer Circuit Boards (30-60 mins)
Task: Purchase a Desoldering Iron for Removing Bad Chips from Atari 8-Bit Computer Circuit Boards Needed: Desoldering Iron, Circuit Board, Hot Air Rework Station Time: 30-60 minutes Introduction Repairing Atari 8-Bit Computers inevitably requires removing and replacing bad chips. Some 800XLs, such as those made
Read morePurchase an Oscilloscope for Troubleshooting Problematic Atari 8-Bit Computers (30-60 mins)
Task: Purchase an Oscilloscope for Troubleshooting Problematic Atari 8-Bit Computers Needed: An oscilloscope Time: 30-60 minutes Introduction As I reviewed in my previous post about multimeters, I have been learning how to troubleshoot and repair Atari 8-bit computers. Central to this effort is an oscilloscope
Read morePurchase a Multimeter for Troubleshooting Problematic Atari 8-Bit Computers (15-30 mins)
Task: Purchase a Multimeter for Troubleshooting Problematic Atari 8-Bit Computers Needed: A multimeter Time: 15-30 minutes Introduction The Atari 8-bit line of computers were well-made and remarkably resilient even after more than 40 years. I have had several dozen 8-bits pass through my hands over
Read moreDiagnose and Fix an Atari 1050 Disk Drive (30-60 mins)
Task: Diagnose and Fix an Atari 1050 Disk Drive Needed: 1050 Disk Drive, lithium grease, isopropyl alcohol Time: 30-60 mins Introduction Everyone hates that dreaded moment when an Atari disk drive won’t boot. Fortunately, there are a number of common issues which are relatively easy
Read moreTips for Troubleshooting a Defective Atari 8-bit Computer (15-30 mins)
Task: Tips for Troubleshooting a Defective Atari 8-bit Computer Needed: web browser Time: 15-30 mins Introduction I have always been impressed with how reliable Atari 8-bit computers are. I have more than a dozen and they all work. What do you do if you get
Read moreRepair an Atari 1020 Printer (30-60 mins)
Task: Repair an Atari 1020 Printer Needed: 1020 printer, 3D printed gears Time: 30-60 minutes Introduction I had an Epson dot matrix printer with my Atari 800 back in the day. It served me well but wasn’t that great with graphics and was only black
Read moreClean an 810/1050 Disk Drive Head (15-30 min)
Task: clean an Atari 810/1050 disk drive head Needed: Phillips-head screwdriver, Q-tip, alcohol Time: 15-30 minutes Introduction I started out back in the early 80s with an Atari 400 computer and a 410 cassette recorder for storing programs. Working with the 410 was tedious and
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