Main channel: I thought this would be an easy fix. I was wrong. (Patreon)

Published:

2024-04-26 00:26:36

Imported:

2024-05

Content

Hello my patrons! So this was part 2 of the recent mystery box video was I was going test some of the items from that box. Well -- things didn't exactly go to plan. I was just going to quickly test the AST MegaPlus II card from 1983 and then was going to move on to other stuff. Things did not go to plan as this card did not work properly .... so I set off to see about repairing it.

I ended up going down a big rabbit whole on this one -- and as you can likely see from the thumbnail, the fault stumped me! So prepare yourself for digging into the schematics and learning how to (try) to manually test RAM on a PC while I try to get this card working.

Thanks for all your support!

Direct link: https://youtu.be/ascPR_uWnM0

Files

I thought this would be an easy fix. I was wrong. (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 Adrian's Digital Basement Merch store: https://my-store-c82bd2-2.creator-spring.com/ Adrian's 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