Repair of a faulty Twinhead CT-6040S Hercules/MDA video card @adriansdigitalbasement
Repair of a faulty Twinhead CT-6040S Hercules/MDA video card  @adriansdigitalbasement
Uploaded April 2025 | Updated September 2026, 2 weeks ago
This ISA video card doesn't work. There are no schematics so this is going to be an adventure to figure out why this card bad. Get your oscilloscope ready!

-- Links

NCC Turbo XT:
youtu.be/qtIehaeupXs

IBM MDA card schematics:
minuszerodegrees.net/oa/OA%20-%20IBM%20Monochrome%20Display%20and%20Printer%20Adapter.pdf

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
Repair of a faulty Twinhead CT-6040S Hercules/MDA video cardTroubleshooting floppy drives with a repair (Tandon TM-100)HDMI video from your Apple II with this cheap and simple project (A2DVI)See why Lordes clear CD is so hard to playThe Mac Plus had modern multi monitor support in 1986 and I got it working!I was shocked at what was keeping this Acorn Electron from working (Acorn Electron Repair)Hacking S-Video into a cheap 13 Color TV (Sharp 13J-M100)I did everything wrong when fully testing this C128DThis is one of the best monitors of all time (Commodore 1702)Wait .. what? Why is there an extra spacebar?Fixing broken interrupts on a PC XT clone motherboardA 64C future repair, PET Keyboard Stickers, a USB music keyboard, and some 3D printed goodies
Adrians Digital Basement |

Repair of a faulty Twinhead CT-6040S Hercules/MDA video card

SHARE TO X SHARE TO REDDIT SHARE TO FACEBOOK WALLPAPER