Uploaded March 2025 | Updated September 2026, 2 weeks ago
I love saving these old parts from the landfill, and this stylish little Amber monitor was destined to to be recycled, so let's fix it.
-- Links
Leading Edge:
en.wikipedia.org/wiki/Leading_Edge_Products
DR-1240 Information: (Comes in green too!)
leadingedgecomputers.com/dr_1240_green_screen.html
Adrian's Digital Basement Merch store:
my-store-c82bd2-2.creator-spring.com
Adrian's Digital Basement ][ (Second Channel)
youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
patreon.com/adriansdigitalbasement
My GitHub repository:
github.com/misterblack1?tab=repositories
-- Tools
Deoxit D5:
amzn.to/2VvOKy1
store.caig.com/s.nl/it.A/id.1602/.f
O-Ring Pick Set: (I use these to lift chips off boards)
amzn.to/3a9x54J
Elenco Electronics LP-560 Logic Probe:
amzn.to/2VrT5lW
Hakko FR301 Desoldering Iron:
amzn.to/2ye6xC0
Rigol DS1054Z Four Channel Oscilloscope:
rigolna.com/products/digital-oscilloscopes/1000z
Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:
amzn.to/3adRbuy
TL866II Plus Chip Tester and EPROM Programmer: (The MiniPro)
amzn.to/2wG4tlP
aliexpress.com/item/33000308958.html
TS100 Soldering Iron:
amzn.to/2K36dJ5
ebay.com/itm/TS100-65W-MINI-Digital-OLED-Programmable-Soldering-Iron-Anti-static-Structure/113382669853
EEVBlog 121GW Multimeter:
eevblog.com/product/121gw
DSLogic Basic Logic Analyzer:
amzn.to/2RDSDQw
ebay.com/itm/USB-Logic-DSLogic-Basic-Analyzer-16Ch-100MHz-4Ch-400MHz-Xilinx-Spartan-6-FPGA/202543965672
Magnetic Screw Holder:
amzn.to/3b8LOhG
harborfreight.com/4-inch-magnetic-parts-tray-90566.html
Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
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)
retrotink.com
Plato (Clone) Side Cutters: (Order Five)
ebay.com/itm/1-2-5-10PCS-Micro-Scissor-125mm-PLATO-170-Electronics-Cutter-Side-Cutting-Pliers/163458746184
Heat Sinks:
aliexpress.com/item/32537183709.html
Little squeezy bottles: (available elsewhere too)
amzn.to/3b8LOOI
--- Instructional videos
My video on chip removal without damage:
youtube.com/watch?v=XQVjwPsVFd8
--- Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino
I love saving these old parts from the landfill, and this stylish little Amber monitor was destined to to be recycled, so let's fix it.
-- Links
Leading Edge:
en.wikipedia.org/wiki/Leading_Edge_Products
DR-1240 Information: (Comes in green too!)
leadingedgecomputers.com/dr_1240_green_screen.html
Adrian's Digital Basement Merch store:
my-store-c82bd2-2.creator-spring.com
Adrian's Digital Basement ][ (Second Channel)
youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
patreon.com/adriansdigitalbasement
My GitHub repository:
github.com/misterblack1?tab=repositories
-- Tools
Deoxit D5:
amzn.to/2VvOKy1
store.caig.com/s.nl/it.A/id.1602/.f
O-Ring Pick Set: (I use these to lift chips off boards)
amzn.to/3a9x54J
Elenco Electronics LP-560 Logic Probe:
amzn.to/2VrT5lW
Hakko FR301 Desoldering Iron:
amzn.to/2ye6xC0
Rigol DS1054Z Four Channel Oscilloscope:
rigolna.com/products/digital-oscilloscopes/1000z
Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier:
amzn.to/3adRbuy
TL866II Plus Chip Tester and EPROM Programmer: (The MiniPro)
amzn.to/2wG4tlP
aliexpress.com/item/33000308958.html
TS100 Soldering Iron:
amzn.to/2K36dJ5
ebay.com/itm/TS100-65W-MINI-Digital-OLED-Programmable-Soldering-Iron-Anti-static-Structure/113382669853
EEVBlog 121GW Multimeter:
eevblog.com/product/121gw
DSLogic Basic Logic Analyzer:
amzn.to/2RDSDQw
ebay.com/itm/USB-Logic-DSLogic-Basic-Analyzer-16Ch-100MHz-4Ch-400MHz-Xilinx-Spartan-6-FPGA/202543965672
Magnetic Screw Holder:
amzn.to/3b8LOhG
harborfreight.com/4-inch-magnetic-parts-tray-90566.html
Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
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)
retrotink.com
Plato (Clone) Side Cutters: (Order Five)
ebay.com/itm/1-2-5-10PCS-Micro-Scissor-125mm-PLATO-170-Electronics-Cutter-Side-Cutting-Pliers/163458746184
Heat Sinks:
aliexpress.com/item/32537183709.html
Little squeezy bottles: (available elsewhere too)
amzn.to/3b8LOOI
--- Instructional videos
My video on chip removal without damage:
youtube.com/watch?v=XQVjwPsVFd8
--- Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino
![Testing and repairing a mysterious Amiga art project
Whats is this thing? Its a deconstructed Amiga 500 that was found at a garage sale for $2. Who made this and why? And the biggest question, does it work?
Links
Amiga Test Kit:
https://github.com/keirf/amiga-stuff/releases
Amiga hardware database:
https://amiga.resource.cx/
Mitsumi keyboard schematic:
https://eab.abime.net/showthread.php?t=81893
Interim Computer Festival (in Seattle:)
https://sdf.org/icf/
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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 Testing and repairing a mysterious Amiga art project](https://i.ytimg.com/vi/ZYxB2IekAas/mqdefault.jpg)
![Does this dead laptop have a gas plasma display? Lets try to revive it to find out! Samsung S5200
Ive had this Samsung S5200 laptop kicking around the basement for a year or two now and Ive always been so curious to know more about this machine. This particular specimen is dead, so trying to turn it on reveals nothing. It also seems to be totally unknown to the world with no information about it existing outside of the odd eBay listing and a single post on VCF Forums.
Lets see if I can revive the machine so it can reveal some of its secrets.
Part 1: This part!
Part 2: https://youtu.be/iqELLO1OsJY
Links
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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 Does this dead laptop have a gas plasma display? Lets try to revive it to find out! Samsung S5200](https://i.ytimg.com/vi/Zbu4Mhdm6EA/mqdefault.jpg)
![TRS-80 Model 4 / TRS-80 CoCo mash up (CoCo Repack)
They say you cant judge a book by its cover. That definitely applies to this TRS-80. Thank to Tim Lindner for donating this machine to me. @timlindner
Part 1: This video!
Part 2: https://youtu.be/lYpzxO75u2Y
Part 3: https://youtu.be/fFf3QM1XgnE
Video Links
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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 TRS-80 Model 4 / TRS-80 CoCo mash up (CoCo Repack)](https://i.ytimg.com/vi/_0XGFz67DIc/mqdefault.jpg)
![The Zenith ZT-1 is kicking my butt and Im running out of ideas.
Im back on the dead Zenith ZT-1 and its time to go through my list of faults and try to figure out what is broken. (Again!)
Part 1: https://www.youtube.com/watch?v=5VLS-vUDV1I
Part 2: https://youtu.be/5Cdh13hjNf0
Part 3: This part!
Part 4: https://youtu.be/-OYCf5ll7_s
0:00 Intro
1:46 RGB2HDMI and glitching video
17:30 Analyzing how the 8275 actually works
40:28 Time to break out the logic analyzer (again)
Links
Dumps of the ROMs and other info on Github:
https://github.com/misterblack1/zenith_zt1/tree/main
Additional photos:
https://terminals-wiki.org/wiki/index.php/Category:Zenith
Intel 80xx MCU datasheet:
https://www.keil.com/dd/docs/datashts/intel/80xxah_ds.pdf
Intel 8275 Datasheet:
https://www.jameco.com/Jameco/Products/ProdDS/52821.pdf
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
My GitHub repository:
https://github.com/misterblack1?tab=repositories
Instructional videos
My video on chip removal without damage:
https://www.youtube.com/watch?v=XQVjwPsVFd8
Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino The Zenith ZT-1 is kicking my butt and Im running out of ideas.](https://i.ytimg.com/vi/_5KZJfpuhd0/mqdefault.jpg)
![Repairing a smashed-up Atari 400 computer
Ive had this smashed Atari 400 for a number of years and its never worked correctly. Lets dig in to this old 8-bit computer and figure out whats wrong with it and fix the broken case.
0:00 Intro
2:34 Teardown
15:02 Bench testing and troubleshooting
1:17:35 What is the minimum needed for a working Atari 400?
1:21:01 Atari Super SALT Diagnostic Cart
1:32:02 Fixing the broken case
Links
The service manual I used:
https://www.retromaniek.pl/wp-content/uploads/2019/09/400_800sm.pdf
Information on the replacement keyboard:
https://forums.atariage.com/topic/362226-a-bkey-and-a-not-a-bkey-400-keyboard-replacements/
Atariage thread on the Super SALT carts:
https://forums.atariage.com/topic/194736-super-salt-diagnostic-carts/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
My GitHub repository:
https://github.com/misterblack1?tab=repositories
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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
Instructional videos
My video on chip removal without damage:
https://www.youtube.com/watch?v=XQVjwPsVFd8
Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino Repairing a smashed-up Atari 400 computer](https://i.ytimg.com/vi/_H4v-LVztk0/mqdefault.jpg)
![Booting UNIX on the Plexus P/20 didnt go to plan
Its time to boot the Plexus P/20 into UNIX, or at least try to! In the previous parts I managed to dump the hard drive (for archival purposes) and dump the ROMs. In Part 2 I worked on making sure the power supplies were stable and working well enough to run the machine. Now its time to actually try to boot this machine into UNIX and see if it works!
Part 1: https://youtu.be/iltZYXg5hZw
Part 2: https://youtu.be/lCPZAYvk940
Part 3: This part
Part 4: https://youtu.be/Ve1SuuRkx_o
Links
Plexus P/20 Discord channel at Usagi Electric:
https://discord.gg/rYX6es6cbA (Plexus channel)
General Adrians Digital Basement channel:
https://discord.gg/Nhe8VHqZny
My Github Repo (with ROM dumps and images)
https://github.com/misterblack1/plexus-p20
Plexus P/20 Brochure:
http://www.bitsavers.org/pdf/plexus/brochures/Plexus_P15_P20_Brochure_1985.pdf
Plexus Unix:
http://www.bitsavers.org/pdf/plexus/brochures/Plexus_SYS_5.2_Brochure_1985.pdf
MFM emulator:
https://www.pdp8online.com/mfm/mfm_old.shtml
Fujitsu Hard Drive Brochure:
https://archive.org/details/bitsavers_fujitsubro1984_2565589
Omti 5200 Manual:
https://oldcomputers.dyndns.org/public/pub/roms/omti-5400/omti_5000_series_reference_aug85.pdf
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
My GitHub repository:
https://github.com/misterblack1?tab=repositories
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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
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 Booting UNIX on the Plexus P/20 didnt go to plan](https://i.ytimg.com/vi/_IrxvDE6Fyo/mqdefault.jpg)
![A Mac Classic with 4mb of RAM without using the RAM expansion card
After the recent Mac repair-a-thon, I had a Mac Classic motherboard with a missing 74LS174. I thought about just replacing that IC but realized I could actually do a simple mod to the motherboard to give it 4mb of onboard RAM instead of just 1! (And I wouldnt need to replace the 74LS174, so it would actually save me money.
Info
How to modify the Mac Classic for 4mb onboard as seen on Adrians Digital Basement
** Remove two chips:
Remove UL1 CAS PAL (no longer needed!)
Remove UH6 74LS174 (no longer needed!)
** Modify system to think it has 4MB on the motherboard:
Pin 13 of UI4 BBU:
Remove R42 470ohm (under motherboard - this pulls pin to ground)
Pull up PIN 13 via 10K to 5V
(I did this by running a jumper between the left side of R42 and R41)
Pin 17 of UI4 BBU:
Should be pulled up to 5v already (verify but mine was already at 5v)
** Remove old 44256 RAM chips (8 of them, UK1-UK8)
** Install 4400 RAM chips (4x1mbit - I took these off a 4mb 72pin SIMM)
** Make connections to connect CAS lines from UI4 BBE to RAM:
Connect UL1 PIN 7 CAS0H to UL1 PIN 24 (CAS0H to UK1/3 DB8-14)
Connect UL1 PIN 6 CAS0L to UL1 PIN 25 (CAS0L to UK5/7 DB0-7)
Connect UI4 PIN 16 CAS1L to UL1 PIN 27 via 22ohm (CAS1L to UK6/7 DB0-7)
Connect UI4 PIN 19 CAS1H to UL1 PIN 26 via 22ohm (CAS1H to UK2/4 DB8-14)
(22ohm is just to make sure shorted DRAM doesnt kill the UI4 BBU)
Remove (optionally) and jumper over R43 and R56 (22ohm resistors) as these are in series with R3 and R19. This gives the CAS lines just 22 ohms (versus 44 ohms)
This replicates the Mac SE design exactly, in fact the Mac Classic is really a Mac SE... The UI4 BBU chip is the same one on the Mac SE, even though the part# is different, it seems to work in an identical way.
Links
Mini Mac Repair-a-thon:
Part 1: https://youtu.be/lHvGc4LWR0g
Part 2: https://youtu.be/nSoSX6XV7t4
Part 3: https://youtu.be/xx08YXkUOnQ
Recapping the Mac Classic II Motherboard
https://youtu.be/rpVAg6hG Y
Previous Mac Repair-a-thon from 2020:
Part 1: https://youtu.be/lKD65I86XGQ
Part 2: https://youtu.be/kNhVQWH318M
Part 3: https://youtu.be/uatqcZRzmt0
Part 4: https://youtu.be/zC0qi5dQsWs
Part 4.5: https://youtu.be/YikOY8WTnLU
Part 5: https://youtu.be/PHTnauC020o
Part 6: https://youtu.be/mqWCPkfcr1A
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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 A Mac Classic with 4mb of RAM without using the RAM expansion card](https://i.ytimg.com/vi/_iE-CKcyR2E/mqdefault.jpg)
![Vintage NES clones: Testing, comparing and improving
(See pinned comment for updates) Did someone give you a NES clone for Christmas? Lets put a couple vintage NES clones through their paces and see how well they compare to the real thing.
Links
NES motherboard picture:
https://www.copetti.org/writings/consoles/nes/
Accuracy Coin ROM:
https://github.com/100thCoin/AccuracyCoin
100th Coin Youtube channel:
https://www.youtube.com/watch?v=oYjYmSniQyM
Mapperless demo:
https://www.pouet.net/prod.php?which=103928
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
My GitHub repository:
https://github.com/misterblack1?tab=repositories
Instructional videos
My video on chip removal without damage:
https://www.youtube.com/watch?v=XQVjwPsVFd8
Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino Vintage NES clones: Testing, comparing and improving](https://i.ytimg.com/vi/_yVGCwotNZo/mqdefault.jpg)
![PC archeology: Treasure hunting inside old PCs
#IBMPC #PCclones #PCarcheology
On the bench we have three IBM PC computers: One original IBM PC 5150 and two PC clones. Its always fun to see what we will find inside these old computers, so lets open them up and see which work and what fun things might be inside.
Info
Machines in this video:
IBM PC 5150
Precision XT (Powered by SpeedPac 286 VICTOR)
Linde Technology PC XT Clone
Other PC Archeology videos
HP Vectra: https://youtu.be/mbL6JuUesiA
Compaq Persario 425: https://youtu.be/WfBRfp9IRlM
Mystery Mini Tower: https://youtu.be/LLgFU7S7F0Q
Leading Edge Model D: https://youtu.be/mqDQ7S5A0Xc
PC XT with a strange power supply: https://www.youtube.com/watch?v=LP0S9PZTb4w
Laser XT Turbo: https://www.youtube.com/watch?v=36NPrsEcNww
Video Links
Testing the MFM drives from this video:
https://youtu.be/CpQ2j2J6wL0
Fixing shorted tantalums on IBM PCs:
https://www.youtube.com/watch?v=oGJyaNMw_wM
https://www.youtube.com/watch?v=FItTR0wBywE
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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 PC archeology: Treasure hunting inside old PCs](https://i.ytimg.com/vi/alA6KlBIvgY/mqdefault.jpg)
![I got stuck trying to fix this 40 year old RAM card (AST MegaPlus II)
Links
AST MegaPlus II Manual and Schematics:
https://www.minuszerodegrees.net/manuals/AST%20MegaPlus%20II%20-%20Users%20Manual%20-%20August%2083.pdf
Github Repo for ISA Card:
https://github.com/misterblack1/isa-ram-expansion
Minus Zero Degrees Diag ROM for XT
https://www.minuszerodegrees.net/supersoft_landmark/Supersoft%20Landmark%20ROM.htm
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
My GitHub repository:
https://github.com/misterblack1?tab=repositories
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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
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 I got stuck trying to fix this 40 year old RAM card (AST MegaPlus II)](https://i.ytimg.com/vi/ascPR_uWnM0/mqdefault.jpg)
![Restoring a Commodore 1702 monitor using a main board from 2023
Its no secret that I simply love the JVC built Commodore 1702 monitor. Its a solidly built and excellent performing monitor.
One thing that lets the monitor down is the fact that isnt a multi-standard monitor, meaning it only support PAL _or_ NTSC (depending on where there monitor is from.)
Another common problem with these monitors is that most 1702 monitors are now nearly 40 years old, and can be quite worn out.
Lets fix both of these issues by making a one of a kind multi-format and improved 1702 monitor!
0:00 Intro
2:05 Installing the new board
17:11 First power up and setup
28:10 Figuring out how to connect external video inputs and enable S-Video
38:17 Testing out Chroma-Luma input (S-Video)
42:58 Testing the tuner
45:28 Fully testing the completed monitor
56:53 Outro
1:01:29 Addendum (for analog video nerds)
Links
Replacement TV board: ($54 as of Dec 2023)
https://www.aliexpress.us/item/3256805253057004.html
Scanned schematics and service mode info:
https://github.com/misterblack1/yichuang_crt_board
First video using this replacement board:
https://www.youtube.com/watch?v=MoqflFfvkR0
Hannover Bars
https://en.wikipedia.org/wiki/Hanover_bars
Adrians Digital Basement Merch store:
https://my-store-c82bd2-2.creator-spring.com/
Adrians Digital Basement ][ (Second Channel)
https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g
Support the channel on Patreon:
https://www.patreon.com/adriansdigitalbasement
Tools
Deoxit D5:
https://amzn.to/2VvOKy1
http://store.caig.com/s.nl/it.A/id.1602/.f
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 Restoring a Commodore 1702 monitor using a main board from 2023](https://i.ytimg.com/vi/b9MDo0m3ptA/mqdefault.jpg)