Test and try: A cool Analog/Digital VGA card and a couple PC motherboards
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Published 2024-07-24
-- Video Links
Adrian's Digital Basement Merch store:
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Adrian's Digital Basement (Main Channel)
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My GitHub repository:
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-- 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:
www.rigolna.com/products/digital-oscilloscopes/100…
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
www.aliexpress.com/item/33000308958.html
TS100 Soldering Iron:
amzn.to/2K36dJ5
www.ebay.com/itm/TS100-65W-MINI-Digital-OLED-Progr…
EEVBlog 121GW Multimeter:
www.eevblog.com/product/121gw/
DSLogic Basic Logic Analyzer:
amzn.to/2RDSDQw
www.ebay.com/itm/USB-Logic-DSLogic-Basic-Analyzer-…
Magnetic Screw Holder:
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www.harborfreight.com/4-inch-magnetic-parts-tray-9…
Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
www.ebay.com/itm/14-16-18-20-24-28-32-40-pin-IC-Te…
RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI)
www.retrotink.com/
Plato (Clone) Side Cutters: (order five)
www.ebay.com/itm/1-2-5-10PCS-Micro-Scissor-125mm-P…
Heat Sinks:
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Little squeezy bottles: (available elsewhere too)
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--- Instructional videos
My video on damage-free chip removal:
• How to remove chips without damaging ...
--- Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino
All Comments (21)
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Fun fact. A friend of mine used to sell Cirrus Logic chips in the UK. The offices backed onto Leavesden Studios where they filmed the James Bond films (pre Harry Potter days). She used to regularly have to explain the noise of the explosions going off in the background (from the studios) to callers. That's the sort of RETRO TECH STORY you came here for, you know you did.
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I had the same card! It used to be in a PC I called PITA (Pain in the "butt"). I also noticed the TTL output was active when VGA was enabled, but never had a monitor to sync up with to see exactly what it was doing. This video truly made my day, after 26 years of wondering.
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Glad you're feeling better Adrian! Thanks for the vids!
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gotta love the Plexus at the background watching over what's happening at the bench
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"Welcome to Adrian's Digital Dungeon with special guest: The 8-Bit Slot."
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now up to almost 90 mins, it still keeps getting better and better =)
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I always love the longer videos. The Oak and Cirrus cards are a blast from my past. Love the testing videos.
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Not only write what works/not works on cards but also date of testing so you can go back to the footage if/when necessary.
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When the PC/AT was designed, IRQ2 on the first PIC was assigned as the cascade interrupt to spill down to the second PIC that was added.
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Wow... that's some old hardware! Glad to see most of it performed as expected. Also glad to see you feeling better.
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I missed the longer form videos. Yay!
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I think that was all the fun of all the old hardware; making it work after hours or days of frustration. I do miss it as having things that just work leave you somewhat disconnected from what to do when things don't go exactly as planned. I enjoyed this video Adrian.
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I love these circuit board vids. Love seeing soldering action too.
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I've never actually been able to figure out what the heck Dave Jones is saying -- comeagotcha? I still have no idea. We need an aussie to translate for us!
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Here is what I think could be the problem with the CGA: * Check to see that you are not mapping high memory into B8000-BBFFF (CGA Memory). EGA/VGA use the A0000-AFFFF region and not all cards use the B0000-BFFFF region, although some do. Note: Some memory managers skip the last hex digit, and use the left four hex digits as a four digit address. It is possible another card is using that region for something, or a memory manager is mapping high ram into that region for device drivers.
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You can easily add memory modules to that 286 board with SIPP modules without having to source or make SIPP modules. But you have to have some spare 30-pin SIMM sockets. Those can plug directly into the holes of the SIPP connectors and have regular 30-pin SIMMs installed in them. It works, I have one of those motherboards with SIPP sockets and this is how I use it.
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1:07:49 The original, unmodded Doom is capped at 35fps. Although, you were pressing your nose to a wall in a small space, so that's an artificially high framerate. But most of us played Doom closer to 10-15fps back in the day. Not a lot of people had the hardware to run it at full speed when it first came out, so it has a nostalgic look to it when it chugs.
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I suspect the "Multisync" monitor profile outputs nearer to TTL logic levels instead of .7vpp levels that VGA uses. The analog output probably doesn't reach TTL levels, but the "analog on TTL output" is probably something like 1.2vpp, hence the blown out video.
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Did you switch back the 5/6 switches before testing the CGA mode problems?
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Did you try CGA mode with the DIP switch 5 and 6 set to the position the card came with?
