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Main channel: The unfixable motherboard and RAM card work now and we created a new IBM PC diag ROM! (Patreon)

Published:
2024-08-02 23:11:24
Imported:
2024-08

Content

Hello my patrons! Better late than never, this is the next main channel video. I'm revisiting that troublesome XT motherboard that I couldn't fix AND the troublesome AST RAM card I couldn't fix. To help with fixing both of them, I enlisted the help of my friend David to port his March-U code used on the Apple II Dest Test ROM and the TRS-80 Dead Test roms over to the IBM PC! I was hoping such a test would help me figure out exactly what was wrong with both of these items. What is both funny and annoying is that both of them are now working perfectly, and that is without me doing anything!

So I whipped up a video on the Diagnostic ROM anyway, since I feel it should be useful to other enthusiasts trying to fix their old PC machines -- and then I go into what I think happened to make these two unfixable things work again.

Thanks for all your support!

Direct link: https://www.youtube.com/watch?v=KcrMssDp8Mo

Files

We created a new RAM test ROM to help fix the unfixable motherboard and RAM card for no reason

I recently had a number of videos where I struggle to understand why my XT clone motherboard had fata RAM issues that prevented it from working. I tried to fix it but got no where. The same thing happened with an AST RAM card, where it also had random issues that I couldn't sold. So with my friend David, we created a new IBM PC diagnostic ROM that runs a very comprehensive RAM test to help fix these two broken parts, but they just work now! What the ........ -- Links IBM PC RAM diagnostic ROM: https://github.com/ki3v/xtramtest Motherboard RAM issues videos: https://www.youtube.com/watch?v=IPryUBnbM_I https://www.youtube.com/watch?v=GMh5YUbLqLs AST RAM card repair (attempt): https://youtu.be/ascPR_uWnM0 XT Motherboard repair video: Part 1 - https://www.youtube.com/watch?v=BJAUW2jq2wI Part 2 - https://www.youtube.com/watch?v=VKiuJbhVbrk Book8088 Repair video: https://www.youtube.com/watch?v=m3ETdhOuZ2w (unboxing) https://www.youtube.com/watch?v=DAPCi-TQiy8 (repair) IBM CGA card repair video: https://www.youtube.com/watch?v=0WMTYZ60OvE https://www.youtube.com/watch?v=Ll3Zp3kr8l4 All about March RAM testing: https://www.researchgate.net/publication/3349024_March_U_A_test_for_unlinked_memory_faults https://www.ijvdcs.org/uploads/524361IJVDCS2672-94.pdf Rudd's Diagnostics: https://minuszerodegrees.net/ruuds_diagnostic_rom/misc/Ruuds%20Diagnostic%20ROM%20-%20Tests%20-%20Version%205.1.htm 41256 DRAM datasheet: https://docs.rs-online.com/fdaa/0900766b8002bbd8.pdf 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

Comments

Brian Gorham

I have gotten the place where always check the power supply before I do any testing. But I see why this issue would have been hard to catch as you are only working on the mother board and not a complete system and testing with something you considered known to be good. The thing I really enjoy about your videos is that you never hide the root cause even if it was a mistake in your process. I learn so much from your videos, great work!

J and J's 8-bit Retro and Repair

I suggest going with a pico ATX in the future, but you may still need to elevate the board somehow to allow the cards to be inserted, I know the ISA cards overhang the board. Even better if you supply it using your bench power supply with over current limiting.