Amiga 4000 Repair Part 1: Recapping and RAM issues galore!

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Recapping and repairing my Amiga 4000. It started with a flashing green screen, can I get this machine working?
Part 1: This part!
Part 2: • Amiga 4000 Repair Part...
--- Video Links
Check your A3640 CPU card doesn't have incorrect silk screen polarity for 3 caps:
amiga.serveftp.net/A3640_capac...
Console5 Cap Kit:
console5.com/store/commodore-...
DE-4000 LCR Meter I use:
amzn.to/2V26LVp
ISA-PCI BIOS Post Code Card:
amzn.to/2YgcEAa
Amiga 1010 External Disk Drive Gotek Mount:
www.thingiverse.com/thing:271...
Amiga PCB Explorer:
www.amigapcb.org/
Amiga 4000 Schematics:
www.amigawiki.org/dnl/schemat...
--- Tools
Deoxit D5:
amzn.to/2VvOKy1
store.caig.com/s.nl/it.A/id.16...
Jonard Tools EX-2 Chip Extractor:
amzn.to/2VazxDS
www.jonard.com/Products/EX-2-...
Wiha Chip Lifter:
amzn.to/3a9ftWw
www.wihatools.com/precision-c...
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/digi...
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/33000...
TS100 Soldering Iron:
amzn.to/2K36dJ5
www.ebay.com/itm/TS100-65W-MI...
EEVBlog 121GW Multimeter:
www.eevblog.com/product/121gw/
DSLogic Basic Logic Analyzer:
amzn.to/2RDSDQw
www.ebay.com/itm/USB-Logic-DS...
Magnetic Screw Holder:
amzn.to/3b8LOhG
www.harborfreight.com/4-inch-...
Universal ZIP sockets: (clones, used on my ZIF-64 test machine)
www.ebay.com/itm/14-16-18-20-...
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-...
Heat Sinks:
www.aliexpress.com/item/32537...
Little squeezy bottles: (available elsewhere too)
amzn.to/3b8LOOI
--- Links
My GitHub repository:
github.com/misterblack1?tab=r...
Commodore Computer Club / Vancouver, WA - Portland, OR - PDX Commodore Users Group
www.commodorecomputerclub.com/
--- C64 Stuff
JaffyDOS:
blog.worldofjani.com/?p=3544
C64 Test Harness I use:
• Building a Commodore 6...
C64 Homebrew cartridge PCB: (used for the DeadTest / Diag Cart I use)
www.ebay.com/itm/Commodore-64...
EasyFlash 3 Multi-Cart:
store.go4retro.com/easyflash-3/
--- Instructional videos
My video on damage-free chip removal:
• How to remove chips wi...
--- Music
Intro music by:
Nathan Divino
@itsnathandivino
Outro Music:
Abyss by | e s c p | escp-music.bandcamp.com
Music promoted by www.free-stock-music.com
Attribution 4.0 International (CC BY 4.0)
creativecommons.org/licenses/...

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Опубликовано:

19 июн 2020

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Комментарии : 500

@georgechambers3197 4 года назад

After my lame attempt to clean the motherboard I gave up on the project. The battery was replaced not long before you came and hauled it all away. The battery in the 2500 was also replaced at about the same time. I'm really glad to see you getting the 4000 working again, it was a great computer and I did many hours of graphics work with it. I hope to see you get it working with all the cards that were loaded in it. Thanks Adrian, for the videos!

@kennethschultz6465 4 года назад

Great respect

@OzRetrocomp 4 года назад

This might sound weird coming from a fellow ADB viewer, but thanks for the donation. I'm looking forward to seeing how Adrian brings this A4000 back to life.

@only257 3 года назад

George Chambers ☺️well you give it a good try

@ChaosHusky Год назад

If you sold it cheap you're a git as i'd almost kill for one.. Or would have, except when i had to repair it for a friend and...god they were poorly made and designed! My 1200s are more reliable and easier to work on, that's for sure.

@JamesPotts 4 года назад

I went for years with a piece of Scotch tape holding a SIMM taut in my 386.

@daishi5571 4 года назад

That's disgraceful, use wooden toothpicks!

@johnperkins3935 4 года назад

That 8MB jumper was for a future upgrade that was never released. You should leave it in the other position. 2MB Chip RAM is the maximum.

@jonnymyrberg3180 4 года назад

Yes for the never realised AAA chip :) (Advanced Amiga Architecture)

@PrimalNaCl 4 года назад

Correct. Even with a > 2MB SIMM, it'll never register/use more than 2MB of chip ram.

@jjdigitalvideosolutionsllc5343 3 года назад

Yes, CHIP RAM is limited to 2MB, ignore the 8MB jumper. There are some hacks that will let you put more than 16MB of FAST RAM on the motherboard. Instead of 4x4MB sticks, you can use 4x16MB sticks for 64MB. Even if you don't attempt a 64MB hack, you can install a single 16MB stick of RAM in one socket for a full 16MB. This is useful if you have broken plastic clips on your SIMM sockets.

@only257 3 года назад

John Perkins 😇

@captainandrew016 2 года назад

@@jjdigitalvideosolutionsllc5343 Hey I am an Amiga Noob; and was wondering about an Amiga 4000T. What setup is better; using the fast ram upgrade or ignore that for Zorro 3 ram upgrade on the motherboard? Because I think I read that using both would not be optimal.

@gallgreg 4 года назад

Love the Napoleon Dynamite T-Shirt!!! TRULY AWESOME!!!

@jorgecuelar3391 4 года назад

I dont know why saturdays is always a nostagia trip & enjoy these kinds of videos😇 so a big thanks👍👍👍for uploading

@GadgetUK164 4 года назад

Great to see another A4000 on the way to recovery! Yellow screen, could be lots of things =/ rule out the RTC by removing the chip. If you still get a yellow screen, my money would be on glitchy 245's on the Super Buster side. Could also be the F86 as it was on the Yellow screening A4000 I fixed a few weeks back. Check Super Buster socket too.

@eDoc2020 4 года назад

Yes, it's easier to remove a socketed RTC than to desolder and replace a logic chip. I hope he wasn't actually going to replace the logic chip first.

@nadeembackus2741 4 года назад

I read your comments in your accent 😆😆

@basvanharen2904 4 года назад

@@nadeembackus2741 haha

@brotheredward06 4 года назад

It could still just be that it doesn't like the RAM too - when I tinker with the Minimig FPGA core any time I screw up the SDRam controller I get a yellow screen with asymmetric power light blink.

@BrianRRenfro 4 года назад

When I clicked this in my subs I didn't pay any attention and thought it was another RetroManCave video! Amiga 4000 RU-vid-A-Thon! I am going to become an expert!

@lukezaa10 4 года назад

I also thought that it's RetroCaveMan video :D

@beetooex 4 года назад

Go on Neil. Leave a comment and show us you're watching too.

@adriansdigitalbasement 4 года назад

Heh and I actually recorded this video a few weeks ago before RMC’s video came out. Funny timing.

@davefarquhar8230 4 года назад

I bet some of Neil's baking powder for fluffy muffins would work wonders on the front faceplate.

@BrianRRenfro 4 года назад

@@adriansdigitalbasement So weird too since I NEVER expect to see Amiga content from the US and especially a 4000 although I suspect the PC enclosure style Amigas were the more popular models here since I only know one person who ever owned one but have seen a few in person in professional hands put to video toaster duty.

@GGruba 3 года назад

Great video! I remember the days when Amiga 4000 hit the market. That was something great, like dream machine for most of us. And It seems like it was yesterday... Oh, just realised, that your full house must smell with that lovely vinegar.😊

@only257 3 года назад

G. Gruba 🤩

@little_fluffy_clouds 4 месяца назад

By the time Amiga 4000 was launched in 1992, we had 66 MHz 486 PCs with VGA graphics and SoundBlaster sound, so it was too little, too late. All my friends abandoned ship. I kept my beloved Amiga for another year, but eventually gave up and made the switch as well when Doom came out in 1993. I’ll always be upset that Commodore had the early starter advantage and the technological lead, yet screwed it all up by failing to develop & evolve the platform rapidly enough to remain ahead of the competition..

@rpeetz 4 года назад

Finally someone who don’t say “battery acid” and say what the substance that leaked really is.

@timrb 4 года назад

True. Car batteries have an acidic electrolyte, most other batteries use an alkaline solution.

@ZTK-RC 4 года назад

One time I let a car battery spill on me and I didn’t know what it was but I felt some burning on my lap and took my clothes off and went for shower. Fast forward to the next morning, my clothes were a shredded mess setting on my bedroom floor. I had never seen anything like it but I am a simple man.

@rpeetz 4 года назад

@@ZTK-RC Well car battery is called Lead Acid battery, it is made from diluted sulfuric acid and a lead composite, and sulfuric acid is quite good dissolving organic tissue, NileRed has a really nice video showing the effect of acids on his skin and paper. Usually those old "barrel" battery are Nickel and Cadmium based, and newer versions are Nickel metal hydride batteries. NiMH cells have an alkaline electrolyte, usually potassium hydroxide, which are corrosive too.

@VladoT 4 года назад

I have just realized that it's indeed a basement 😀

@OzRetrocomp 4 года назад

They say these things happens in threes: first RMC, now Adrian ... at this rate The 8-Bit Guy will have an A4000 restoration video out by the end of next month. What are the odds? :D

@basvanharen2904 4 года назад

Its a late Commodore marketing stunt.

@jefbed212 4 года назад

I've noticed that too. Its also common in the 3D printing community.

@otopico 4 года назад

I'm OK is that happens. Amigas deserve all the love.

@MBDB666 4 года назад

I love your troubleshooting methodology and attention given to researching known issues in the forums. These videos give great examples of how to approach the restoration of any brand of computer. Thanks for being so detailed in these, its entertaining and educational. 😁👍

@gallgreg 4 года назад

So excited about _another_ repair video!! Looking forward to you getting the Amiga fully working and upgraded!! Thanks for the steady flow of new content, Adrian!!!

@ThePCPitChannel 4 года назад

I love how happy you get when something works :D

@animatewithdermot Год назад

Watching you take out those RAM chips was like the "cut the red wire" scene in a bomb disposal movie. great stuff! God my old 4K was rickety like this.

@animatewithdermot Год назад

Oh, BTW, regarding the wretched battery: my friend was a great tech admin wizard. He cut all the batteries out of my 4K and two 3Ks (saving them in the process). Solution in adding a battery back, if needed, without risk of future damage: he soldered two wires a few inches long to the motherboard and attached them to the battery, which was now inches away from the motherboard and sensitive parts. Just a thought for anyone who really needs a clock.

@crowbarviking3890 4 года назад

Thank you for uploading each saturday. Love your repair videos.

@MrSatellitehead 4 года назад

Adrian your efforts and videos are greatly appreciated. I could watch these all day long.

@kooziesan 4 года назад

I could watch board fixes every day. So relaxing

@quantass 4 года назад

Thank you, Adrian, for an Amiga repair. Anything C= i'm always fascinated by! Quality channel overall!!

@ThomasSIversen 4 года назад

40 minutes of pure nostalgia. Thanks for providing quality content for a saturday evening!

@electronash 4 года назад

You've been doing some great restoration work on this channel. Very methodical, too.

@hmbpnz 4 года назад

Great videos; thank you. You teleport me back to when I was a kid but show me stuff that I understand now as a EE. Your channel is really unique. Keep those old machines running, man.

@otopico 4 года назад

That's a fine A4000. I wish I could justify buying an A4000 or A1200. I loved those machine back in the day. Great work.

@Codeaholic1 4 года назад

Fantastic video. Adrian your music selection was top tier!

@basvanharen2904 4 года назад

Congratulations for so far! I'm sure you are going to fix the rest and I'am anxious to see the next part. Hopefully you show some more Amiga repairs in the future, there are some true repair experts on RU-vid but your video's are understandable and clear. If this video would have taken 2 hours, I probably sat it out haha. Great effort, thanks!

@LesKingBNE 4 года назад

My only channel that has notifications on and i watch immediately.

@MikeDUtah 4 года назад

That board is GORGEOUS after you cleaned it

@jdryyz 4 года назад

Now this should be interesting. AGA Amigas can be challenging when it comes to repairs. Glad to hear you will still replace the battery.

@dragonhed123 4 года назад

I really enjoyed this video I especially love the end where you do most of the motherboard troubleshooting keep on making awesome videos and looking forward to the next one!!

@CoreyDeWalt 4 года назад

You're correct. I love when creators post longer, more detailed videos

@seanys 3 года назад

Thank you for letting us know about Amiga PCB Explorer. What an amazing resource!

@cablecartman 4 года назад

don't leave us hanging... bring on part two. (amazing work)

@pipschannel1222 4 года назад

Excellent work again Adrian! Getting more professional by the hour ;-) This beautiful 4000 is definitely worth saving 👍

@BollingHolt 4 года назад

Cool! At least you're making progress! I've never owned an Amiga before, and the more of these videos I see about them, the more I want one.

@pawe3130 4 года назад

Moje marzenie z dzieciństwa - Amiga 4000. Świetny sprzęt !

@seanys 3 года назад

I cheered, too, when the Kickstart screen came up. That washing in water bit had me nervous as hell.

@enzofitzhume7320 4 года назад

Adrian, your videos keep on getting better!! Like the new sound tracks.

@Dukefazon 3 года назад

4:50 - that music is so nostalgic! It's not an OST from an old game I guess but it hits just the right notes. Reminds me of Traps and Treasures on the Amiga I guess.

@sircompo 4 года назад

I didn't know those PCB socket pins existed. Very interesting. Thanks for introducing us to the Amiga PCB Explorer as well; that'll come in handy diagnosing the SCSI issue on my A4000T.

@AmstradExin 2 года назад

PCB Explorer for the win!

@kimidri 4 года назад

This video randomly popped up for me , found it very intresting i broke the bank to buy a 4000/40 back when i ran a BBS but it was far too much power so i sold it for about £1000 after about a year and got a a2000 which is still in my loft about 30 years later and a a500 this video has made me thing of digging them out lol

@parrottm76262 4 года назад

I sure love me some Amiga! Looking forward to the A4000 working fully again.

@kaczan3 4 года назад

Soldering montages so relaxing.

@AndyDavis007 4 года назад

Awesome repairing video, Adrian. I must say the music soundtrack was spot on. 🎶

@pyography 2 года назад

Yes, that is an awesome track. My question is what is it?

@dj9volt 4 года назад

I have grown to love Raindropsies I remember hearing it for the first time in your Commodore 64 repairathon video series and it’s AMAZING I know it’s not releated to the video topic but I thought I would share

@chrisprice4287 4 года назад

Love these videos.Would have loved an Amiga back in the day but had my Zx Spectrum during the 80s and had so much fun with it, yes i know it no C64 but it had its charms. Thanks for making my day Adrian in these troubled days stay safe from one type1 to another:-)

@youcrackmeupdude 4 года назад

I really enjoy a good restoration/troubleshooting video. I can imagine Han and Chewy doing the same sort of work on the Falcon.

@2dfx 4 года назад

Adrian - that replacement battery is the newer 3/V80H replacement. It's NiMH instead of NiCd and will not leak! They are a great OEM-style replacement for the NiCd leakers.

@markrhine5809 3 года назад

I think these video's are very, very interesting, I enjoy vintage electronics and I am a first time viewer, but will continue watching these video's. Have a nice day..

@aetch77 4 года назад

Tuned in expecting to see another instalment of the mac repairathon. Was confused to see amiga, figured it would make a nice break, yay.

@Halterung01 4 года назад

Man, I love that intro. Music is just perfect but the thing I enjoy most is that VHS filter. So many of these filters just overdo it whit destabilizing the image and adding an unrealistic amount of noise. This looks bang-on exactly like the results of my own NTSC VHS recordings when using my setup to generate analogue video signals from digital sources for recording.

@biblebadcopycatofcuneiform8210 10 месяцев назад

It's odd to hear "super" being used vs "very" and "really". It's great to see another Amiga restoration.

@georgestyka6088 4 месяца назад

Adrian, never apologize for your HVAC or similar, you are making a video, life does not stop and you are not in a multi million dollar studio, and backgroud noise, setup, mistakes are life and why I like to watch. You are doing what you love, the best you can, by yourself. Ignore those who critique or offer criticism. It is easy to tell others what they are doing right and wrong, much harder to be the one actually doing it. Keep up the great work, and I know this is an older video, but it is the 5th time watching, you are top notch, thank you for keeping it real.

@cesarferrari3385 4 года назад

Great work!! thanks for showing and teaching so well how to repair theses machines.

@duderobi 4 года назад

I am always reminded on star wars episode 1 "It's working, it's working"

@W3DRK 4 года назад

FYI there’s a very strong possibility that A3640 has the capacitor silkscreens reversed for several of them, causing the replacements be installed with reversed polarity.

@Brianreese83 4 года назад

You know... like... nunchuck skills, amiga hunting skills, soldering skills, computer hacking skills. Girls only like guys who have great skills.

@10MARC 4 года назад

Great stuff, Adrian! Glad you found a chip that would work for CHIP RAM. Just leave that jumper at 2 MB. This will make a really nice A4000 - and the Toaster that was in there will be great! The A4000 is what I use for probably about half of my videos.

@darkstatehk 3 года назад

32:41 Slight and careful application of your de-soldering heat gun onto to the plastic whilst manipulating it, will get them back into a compliant position (memory removed of course!). By the way, this is the best retro themed channel in my opinion. It's not just the fun things that you do, it's your personality. Everyone wants a friend next door just like you!

@_to_dream_or_not_to_dream 4 года назад

Your videos are very enjoyable to watch. Keep it up.

@JimLeonard 4 года назад

Congrats on your success. It can be difficult trying to troubleshoot a system you're not familiar with. I had a Rev C. motherboard that wouldn't work no matter what until someone clued me in that the Rev C. has no onboard crystal osc. which accelerator boards require.

@koushiroizumi0 4 года назад

So you can't use a Rev C. with an accelerator board? Or does it require a special one?

@RetroReviewYT 4 года назад

Enjoying this so far. Watched Retro Man Cave’s video on the Amiga 4000 as well.

@jetsonian 4 года назад

Console5 is the best. I have never received a kit that's short and they're ALWAYS high-quality components. I'm glad to see you've skipped the Digikey search and are just going with with best now. :-)

@SledgeFox 4 года назад

Great and amazing, thank you very much! So enjoyable; Good thing you got the Super Buster 11 and not the buggy 9 version.

@zaooo 4 года назад

Good to know that my ears still capture high frequencies well, that CRT at 2:06 is super audible :D

@hackbyteDanielMitzlaff 4 года назад

FINALLY; Adrian got an Amiga 4000 in his Digital Basement. Love it ;)

@brianv2871 4 года назад

I think he's actually had that Amiga 4000 for a few years now.

@DevilishDesign 4 года назад

Love the T-Shirt!! :)

@theannoyedmrfloyd3998 4 года назад

I will be super impressed when you finally do some Atari ST / TT / Falcon repairs.

@FernandoelChachi 4 года назад

Wonderful A4000. I love videos repairing miggys and you've got one of the best ones if not the best.

@Schule04 4 года назад

Take care of that Pentium motherboard, it's a pretty good one. It's made by Intel and called the Advanced/EV. And yes, Pentiums use a 64bit memory bus so you need to use pairs of memory modules. In 486s you can use individual sticks of 72pin ram or 4 30pin simms.

@Rv-Tech 4 года назад

Bon boulot professeur. Nice Work Professor. 👍🏻

@WY.C64-Guy 4 года назад

2:30 - "Sorry for noise, AC kicked on...." Multiple other videos - "Sorry for noise, furnace kicked on..." - To tell you the truth, I don't notice. Are you doing some post-recording audio adjustments to minimize it? 4:30 - MT RAM... *GASP!* . Great video, Adrian. Looking forward to how this turns out!

@UberAlphaSirus 4 года назад

I was saving this for a series binge, but I caved in.

@iamdarkyoshi 4 года назад

I use my actual vacuum cleaner from the 70's with the hose on the output, since it lets you do that. The heat from the motor does a great job drying washed boards. Even had a CRT board survive the procedure and the board works now! Obviously I made sure it was properly dry, a widescreen CRT board is going to have some pretty nasty voltages on it!

@lokz9632 4 года назад

Longer boot time is normal with kickstart 3.0 if no Hard Disk is connected. I remember fear I felt when I booted my A1200 without HDD... 😁

@homelate1306 4 года назад

Great video Adrian!

@ScoopexUs 10 месяцев назад

Nice that you got the A4000 booting! Winced a bit as you plunged the motherboard into water with not even IP rated components left on it. There are also lots of crannies and especially spot under chips that can trap moisture for a very long time. I also recommend snipping caps with cable stripping pliers (not wedge-shaped normal pliers), if you have no desoldering station. Twisting is a method that guarantees that you put a great force on the traces, which is bad.

@bobz1736 4 года назад

So entertaining and interesting. Thank you 😊

@JARVIS1187 4 года назад

I really want to know, why people downvote such great videos over and over 😱

@myownalias 4 года назад

I love seeing some Amiga content on the channel. In my mid to late teens, I had an Amiga 1200 and absolutely loved it. I always lusted after the Amiga 4000, but it was way out of my price range, I saved my allowance for the best part of 2 years to buy an A1200, and then saved again for a 68030 upgrade with 4MB of fast RAM, then saved up again to get a 340MB 2.5in HDD. When I got my first PC, PII 350, I handed my niece the A1200, which swiftly got broken, much to my annoyance. I really wish I held onto it, I'd love to break out Geoff Crammond F1GP on the original hardware.

@mrcassioo 4 года назад

Oh how familiar this sounds. The guy I bought my A1200 from had only moments earlier unpacked a brand new A4000. Sure I was super happy about the A1200, but at the same time I couldn't help but feel a lil envious as I carried my new baby home. :P

@LadislavAlexa 4 года назад

Oh! Nice video Adrian! :)

@macdaniel6029 4 года назад

Noooo! Nooo! Noo! You can´t do this. These damn cliffhangers... :(

@aqualung2000 3 года назад

I absolutely love your channel. You should have a patreon. If you did I would definitely be one of your patrons. I love your technique for cleaning those old motherboards, but I would feel so much better if you were using distilled water for that very last rinsing step (or if not distilled, then tap water run through a reverse-osmosis water filter.) I used to live in Oregon so I know you guys have _pretty_ soft water (which is great!) And I seriously doubt there would be enough mineral deposit to do anything to that motherboard. Buit...it would make me *feel* better :)

@hobsonbeeman7529 Месяц назад

Whenever I need to make changes to the mobo’s, I typically take a picture of it before I do anything to it, especially since it may be put aside while waiting on parts or other projects.

@nicwilson58 Год назад

WOW Adrian, there I was watching this repair and what do i see? My old SysInfo program I wrote in Assembly language many years ago and is still being used, that is kinda cool :)

@KrishnaDraws 4 года назад

Console5 is a good place to buy replacement caps. I've purchased from them before when replacing caps on my Mac SE FDHD.

@AiOinc1 4 года назад

This will be an interesting repair series, hope none of those custom chips are bad! Vote for Pedro!

@catcam 4 года назад

Thanks for great content !! Stay safe !!

@warrentb1 4 года назад

If you're worried about brittle plastic breaking it often helps to warm it up slightly, a hair dryer or warm water will work depending on the application.

@LuxorVan 4 года назад

I finally had to buy a new roll of desoldering braid, I only use the chem-wik #4 10-50L and that roll lasted me 5 years! It is readily available for around $19 on ebay and works like a dream.

@koushiroizumi0 4 года назад

Hey Adrian! Here's a tip on how to clean corrosion. Take a toothbrush, dip it in vinegar and GENTLY rub the area. Repeat if necessary. It really works wonders. You can also use this with regular short bristles paintbrushes, for cleaning corrosion or cleaning of dirt in general, although for dirt you'ld idealy be using some other substance.

@mrcallypso1 3 года назад

Reminds me of working on my sister's Packard Bell. The layout of the memory and position of the cpu are very similar.

@TheSulross 4 года назад

And this video is a good illustration for why I don't bother to buy vintage computers. Wouldn't have any recourse for anything that is failed or starts to fail. I only look to modern recreations of vintage computers for a means to get a retro fix

@thedungeondelver 4 года назад

You can't get 8mb chip RAM on an Amiga, at all (unless you're emulating). The jumper on the A4000 motherboard is called the "Free Beer" Jumper - there is no free beer, there is no 8mb chip. The board was designed before the AGA chipset was finalized, and once it was it was far less than the engineers wanted, including being limited to 2mb.

@gertsy2000 4 года назад

Putting caps back on the same way you took them off trusts that they were on correctly in the first place. I think you put C105, C106 & C107 from the A3640 CPU Card on the wrong polarity. Known issue with the silk screen. Could cause problems over time. That obviously isn't the issue though. You seem well on the way to fixing that. Great video!

@SparksNZeros 4 года назад

for potentially old brittle plastics like that i just pre heat them with a hairdrier on low, helps make them that tiny bit more flexible to get things apart

@gbowne1 4 года назад

at 17:37 the 74HCT174 chips are hex positive edge-triggered D-type flip-flops with individual data inputs (Dn) and outputs (Qn). The two 74HCT166T chips are an 8-bit serial or parallel-in/serial-out shift register.

@gureitan2924 4 года назад

Oh I’ve been waiting for the Macintosh Portable rescue!

@jester6856 4 года назад

Love this video ❤️

@Synthematix 6 месяцев назад

Amiga 4000T was a beast

@bobsobol 4 года назад

Daughter-board... Is the word you were looking for, for the CPU card. Technically, the PII and PIII which came on a Slot, rather than socket were also Daughter-board, but the term was _used_ far more commonly on the Amigas. Incidentally, the SIMM slots also have clips which spring to the out position and only _just_ catch the stick.