Welcome to part 4 of the Apple II+ repair series! In this video, I fix the faulty keyboard and figure out what is wrong with the language card. Warning: Includes liberal use of CALL -151! Let's get right to it! Part 1: https://www.youtube.com/watch?v=qTkX7rkq_Kk Part 2: https://www.youtube.com/watch?v=1iCLdbF1sgw Part 3: https://www.youtube.com/watch?v=pkxs-180IKU Part 4: This video! Part 5: https://www.youtube.com/watch?v=984mZex2pKY Part 6: https://www.youtube.com/watch?v=ukvT7131pRU 0:00 Intro 1:04 Solving the keyboard issues 8:17 Further testing of the machine and identifying another fault 17:34 Troubleshooting the language card 21:33 Using machine language monitor to figure out what's wrong with the language card 34:35 More keyboard issues 37:38 Final(?) reassembly To copy Apple II roms into the language card: 800: A0 D0 84 FF A0 00 84 FE B1 FE 91 FE 88 D0 F9 E6 FF D0 F5 60 00 800G To copy language card back into main memory ($2000): 840: AE 80 C0 A0 D0 84 FF A0 20 84 FD A0 00 84 FE 84 FC B1 FE 91 FC 88 D0 F9 E6 FD E6 FF D0 F3 AE 82 C0 60 00 840G --- Video Links Calculator used on my phone: Programmer's calculator - BitCalculator https://play.google.com/store/apps/details?id=com.kebstudios.calc&hl=en_US&gl=US IZ8DWF's channel: https://www.youtube.com/channel/UCgwkF_tMMsury1DeszD4Ohg IZ8DWF's video on his replica language card: https://www.youtube.com/watch?v=1KPIAoO1dTU Apple II Memory Map: http://apple2.guidero.us/doku.php/mg_notes/general/mem_map A trip down Memory Lan by Matt Jenkins: (slides borrowed from this) https://www.slideshare.net/mattjenkins355/a-trip-down-memory-lane High-res pictures of my 70's trash towel: https://imgur.com/gallery/eoaMNJv --- Tools Deoxit D5: https://amzn.to/2VvOKy1 http://store.caig.com/s.nl/it.A/id.1602/.f Jonard Tools EX-2 Chip Extractor: https://amzn.to/2VazxDS https://www.jonard.com/Products/EX-2-DIP-IC-Extractor-24-40-Pins Wiha Chip Lifter: https://amzn.to/3a9ftWw https://www.wihatools.com/precision-chip-lifter O-Ring Pick Set: (I use these to lift chips off boards) https://amzn.to/3a9x54J Elenco Electronics LP-560 Logic Probe: https://amzn.to/2VrT5lW Hakko FR301 Desoldering Iron: https://amzn.to/2ye6xC0 Rigol DS1054Z Four Channel Oscilloscope: https://www.rigolna.com/products/digital-oscilloscopes/1000z/ Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier: https://amzn.to/3adRbuy TL866II Plus Chip Tester and EPROM programmer: (The MiniPro) https://amzn.to/2wG4tlP https://www.aliexpress.com/item/33000308958.html TS100 Soldering Iron: https://amzn.to/2K36dJ5 https://www.ebay.com/itm/TS100-65W-MINI-Digital-OLED-Programmable-Soldering-Iron-Anti-static-Structure/113382669853 EEVBlog 121GW Multimeter: https://www.eevblog.com/product/121gw/ DSLogic Basic Logic Analyzer: https://amzn.to/2RDSDQw https://www.ebay.com/itm/USB-Logic-DSLogic-Basic-Analyzer-16Ch-100MHz-4Ch-400MHz-Xilinx-Spartan-6-FPGA/202543965672 Magnetic Screw Holder: https://amzn.to/3b8LOhG https://www.harborfreight.com/4-inch-magnetic-parts-tray-90566.html Universal ZIP sockets: (clones, used on my ZIF-64 test machine) https://www.ebay.com/itm/14-16-18-20-24-28-32-40-pin-IC-Test-Universal-ZIF-Socket-Fs/303206721971 RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI) http://www.retrotink.com/ Plato (Clone) Side Cutters: (order five) https://www.ebay.com/itm/1-2-5-10PCS-Micro-Scissor-125mm-PLATO-170-Electronics-Cutter-Side-Cutting-Pliers/163458746184 Heat Sinks: https://www.aliexpress.com/item/32537183709.html Little squeezy bottles: (available elsewhere too) https://amzn.to/3b8LOOI --- Links My GitHub repository: https://github.com/misterblack1?tab=repositories Commodore Computer Club / Vancouver, WA – Portland, OR – PDX Commodore Users Group https://www.commodorecomputerclub.com/ --- Instructional videos My video on damage-free chip removal: https://www.youtube.com/watch?v=XQVjwPsVFd8 --- Music Intro music and other tracks by: Nathan Divino @itsnathandivino Outro Music: Abyss by | e s c p | https://escp-music.bandcamp.com/ Music promoted by https://www.free-stock-music.com/ Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/