Texas Instruments TI-99/4A video RAM fix

▶Neol's Retro Lab's initial TI99 video: https://www.youtube.com/watch?v=tPDP4izVqrk&t=243s ▶Donations: https://www.paypal.me/flashjazzcat ▶Tip or donate: https://ko-fi.com/flashjazzcat ▶Patreon: https://www.patreon.com/flashjazzcat ▶Website: http://www.atari8.co.uk ▶Odysee channel: https://odysee.com/@flashjazzcat ▶Facebook: http://www.facebook.com/atari8/

00:00 Introduction 01:44 Reproducing the fault 04:02 Inventory of peripherals 05:45 A look at the motherboard 10:37 Diagnosis and repair 14:49 Power-on test 16:00 Fully reassembled 17:44 A proper test 18:07 Attempting to program in TI BASIC 20:22 Munchman and another strange quirk 24:39 Summary and conclusion

Soldering and test equipment:

● Hakko FX-951 T12 soldering station: https://uk.farnell.com/hakko/fx951-64/soldering-station-75w-230vac/dp/3367978 ● Best BST-863 hot air rework station: https://www.banggood.com/BEST-BST-863-1200W-220V-or-110V-Intelligent-LCD-Touch-Screen-Heat-Air-SMD-Rework-Station-p-1431173.html ● Anesty (Duratool) ZD-915 thru-hole desoldering station: https://cpc.farnell.com/duratool/d00672/desoldering-station-uk-eu-plug/dp/SD01384 ● Hanmatek DOS1102 dual-channel oscilloscope: https://www.amazon.co.uk/DOS1102-oscilloscope-Professional-Oscilloscope-Bandwidth/dp/B0833X3RFK ● Amtech NC-559 Tacky Flux: https://store.rossmanngroup.com/index.php/amtech-nc-559-v2-30-cc-16160.html ● Goot Wick Desoldering Braid: https://store.rossmanngroup.com/index.php/ab20-gootwick-1-5.html ● Cynel Sn60Pb38Cu2 Tin/Lead Solder Wire: https://www.tme.eu/gb/details/lc60m2-0.7_1.0/solders-wires/cynel/ ● SysCheck v.2.2 by tf_hh: http://www.abbuc.de/component/jshopping/hardware/syc

Equipment and software used for video production:

● Open Broadcaster Studio: https://obsproject.com/ ● 2x Logitech Brio webcams: https://www.amazon.co.uk/Logitech-Gaming-Webcam-Streaming-Compatible/dp/B0748NCPN5 ● USB AV/s-video capture dongle: https://www.amazon.co.uk/Ex-Pro-Grabber-Editor-capture-Windows/dp/B001HB9C1O ● 135W Photography Studio Softbox Light: https://www.ebay.co.uk/itm/135W-Photography-Studio-Softbox-Continuous-Lighting-Soft-Box-Light-Stand-Kit-Set-/142645098730?hash=item21364f78ea ● Final Cut Pro ● Apple Motion ● 15" mid-2015 Apple Retina MacBook Pro

#atari #retrocomputing ... https://www.youtube.com/watch?v=kVztFhJ4kAA