Atari 1200XL U1MB upgrade pantomime

▶Sincere thanks to our sponsor, PCBWay. Click here for a free new user $5 credit: https://www.pcbway.com/setinvite.aspx...
▶Bob Wooley's 1200XL PBI (and single OS ROM) mod: http://retrobits.net/atari/pbi.shtml
▶My new guitar channel:    / @fjcguitar  
▶Patreon:   / flashjazzcat  
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▶Website: http://www.atari8.co.uk
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00:00 Introduction
01:53 Sponsor segment
02:37 Overview of upgrades
05:25 Second channel acknowledgements
06:48 Detailed overview of the 1200XL mainboard
10:59 Bridge rectifier and lack of PBI connector
13:53 Dual OS ROM sockets
14:50 Single chip OS ROM modification
16:08 Socket removal
16:45 Fitting a 3.5mm stereo audio jack
20:00 The primary fault uncovered
20:54 How I figured out PIA was dead
24:44 Now it works
25:17 Pragmatic troubleshooting
27:05 A long 'You touched it, you broke it' rant
36:16 Crashing on
36:47 Power-on test with U1MB
37:33 Spectre AV and PokeyMAX
39:07 Proving the original PIA was dead
41:43 Chasing more faults
44:21 Bricked U1MB recovery attempt
46:25 Testing a spare PLCC flash ROM
47:42 Secondary issue finally fixed
49:09 It works
52:08 Testing SIDE 3.2
54:52 Jailbars and NTSC colour
56:38 Summary and conclusion

Soldering and test equipment:

● Hakko FX-951 T12 soldering station: https://uk.farnell.com/hakko/fx951-64...
● Atten ST-862D hot air rework station: https://www.amazon.co.uk/ATTEN-Profes...
● Anesty (Duratool) ZD-915 thru-hole desoldering station: https://cpc.farnell.com/duratool/d006...
● Hanmatek DOS1102 dual-channel oscilloscope: https://www.amazon.co.uk/DOS1102-osci...
● Amtech NC-559 Tacky Flux: https://store.rossmanngroup.com/index...
● Goot Wick Desoldering Braid: https://store.rossmanngroup.com/index...
● Cynel Sn60Pb38Cu2 Tin/Lead Solder Wire: https://www.tme.eu/gb/details/lc60m2-...
● SysCheck v.2.2 by tf_hh: http://www.abbuc.de/component/jshoppi...

Equipment and software used for video production:

● Open Broadcaster Studio: https://obsproject.com/
● 2x Logitech Brio webcams: https://www.amazon.co.uk/Logitech-Gam...
● SmallRig P200 Led Panel Light: https://www.amazon.co.uk/P200-2500-65...
● Hollyland Lark M1 Wireless Lavalier Microphone: https://www.amazon.co.uk/Hollyland-Mi...
● Logitech Blue Yeti USB Microphonehttps://www.amazon.co.uk/Blue-Recordi...
● Final Cut Pro
● Apple Motion
● Dell XPS 8960 PC (i7-14700, 32GB DDR5, RX 6600 XT)

#atari
#retrocomputing