Corroded Amiga 500 Rev 5 (w/512k ROM upgrade and S-Video out)
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- Опубліковано 26 лип 2024
- #corrosion #amiga #commodore
Welcome to another video in the test and try series. This time we have an Amiga 500 and Digifex Corp VIP box. The computer actually looks a bit worse inside than I was led to believe, so I cleaned it up. Also it's a Rev 5 board so it needs a modification to accept larger 512k ROMs.
0:00 Intro
19:13 Upgrading an Amiga 500 Rev 5 to support 512k ROMs
34:20 Motherboard mod for Rev 5 Amiga 500 to support 512k ROMs
36:59 Testing the Amiga and DigiFex VIP with S-Video to a Commodore 1702
--- Info
DigiFeX Corporation VIP
-- Video Links
Amiga Diagnostic ROM:
www.diagrom.com/
Amiga Logica Diagnostic ROM:
www.amigawiki.org/doku.php?id...
DigiFeX VIP:
amiga.resource.cx/exp/vip
Amiga 500 Rev 5 Schematic:
archive.org/details/system-sc...
Adrian's Digital Basement Merch store:
my-store-c82bd2-2.creator-spr...
Support the channel on Patreon:
/ adriansdigitalbasement
Adrian's Digital Basement (Main Channel)
/ @adriansdigitalbasement
-- Tools
Deoxit D5:
amzn.to/2VvOKy1
store.caig.com/s.nl/it.A/id.16...
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/
--- Instructional videos
My video on damage-free chip removal:
• How to remove chips wi...
--- Music
Intro music and other tracks by:
Nathan Divino
@itsnathandivino - Наука та технологія
As started Adrian, When I was in my teens (early 2000's), I had an old membrane keyboard from my parents compaq presario 5000t. One day a whole group of keys stopped working. I was able to disassemble the keyboard and using a multimeter I found where the trace had broken apart. (unsure what caused it). Soldering was out of the question on the thin plastic membrane, BUT I used some rear window heater grid paint available from auto parts stores. Comes in a real small bottle with a paintbrush. Painted a few coats over the split and reassembled the keyboard. Worked like a charm.
This is definitely the way I would recommend unless it is a dual layer film membrane (sometimes with a third separating layer). Separating the layers can destroy them sometimes depending on how it is made. Single layer membranes can usually be fixed as long as the ribbon cable connector is still good. How long it will last is hard to say, but usually quite a while. Conductive paint is pretty awesome. Needless to say, be careful when doing this because that stuff can make a terrible mess on a board and it is conductive.
A lot of the amiga stores sell new membranes as well as a more sturdy replacement. They also sell a rom fix that just plugs into the rom socket for anything above 1.3
Yeah I bought one from ebay from a guy in Poland worked perfect when my space just stopped working.
I see they make a PCB replacement for the membrane -- that's cool
Heck yeah it’s sweet
Plus membranes can be fixed with those magic silver pens (that's actually what they're designed for).
@@SonicBoone56yeah i have done that before.
It can work but its a bit sketchy
It's nice to see a piece of ITALIAN software running on an American Amiga. :)
Logica was an Italian company which produced accessories for the Commodore Amiga line of computers. Amiga had a huge success in Italy back in the day.
Please take your time, Adrian. 2 videos per week is a lot and if you skip one, now and then, noone will be angry. There is no need to ever rush things.
I repaired my A500 keyboard with silver contact paint. It's about as expensive as printer ink, but does the job fixing hairline cracks in flatflex stuff if it is under low mechanical stress. So once the membrane is inside the sandwich again, it should be fine. Hint though: let the paint dry, it will not conduct properly when still wet. :) (edit: I still haven't edited the video for that one; it's my oldest "eventually" spare content one but on mine one of the Amiga keys was dead, and you need both for the reset combo)
I had the same problem, and come up with same solution - works great! Done it about 7-8 years ago, and it still works flawlessly!
I came here to say conductive ink pen should fix it. The paint is probably more robust.
Fun fact: That's actually what conductive silver pens are designed for! Repairing membrane traces that can be worn off over time.
Adrian needs more iFixit sponsorships, I always enjoy his videos.
Greetings to you Adrian from your neighbour to the north in BC.
The only way I know of to fix one of the A500 membrane keyboards is to seperate the layers and clean the contacts with a pencil eraser. It's risky but does work very well in most cases. If you find carbon pads benieth the keys I would use isopropanol and a cue-tip or other cotton swab. For the carbon pad on the key side, just rub it acros some paper until it leaves a good solid skidmark that is the same width as the pad. Note that this trick also works for TV remotes where keys stop working.
Naval Jelly is nothing short of AMAZING! There’s ALWAYS some in my house!
I had never heard of it until viewers told me about it. It's not my go-to stuff to help rid battery leak corrosion from boards.
Adrian is at his best when tinkering with an Amiga!!!
Back in the day I used a RGB to Scart connector on my Sony CRT. Looked way better then my 1084s monitor!
Very interesting video glad u managed to get it working well 🙏
Hi, When you showed use the clean motherboard. It looked like new, good job.
wow man. that looks like it was frustrating as shit. props for sticking with it
To repair Atari membrane keyboards I've used silver conductive paint, for durability I've added a little superglue on top of the silver conductive paint.
Yeah I used a silver pen on keyboards before with success.
Nice to see we are both members of the 1702 with a front cover club! :)
Heh yeah I'm lucky to have a nice specimen with an in-tact door! I treat it very gingerly.
I have repaired membrane keyboards with a conductive paint, intended for repair of rear window defroster in cars. It works great.
works better for repairing keyboards than using it to repair the defroster
@@mauzzz2418 well I got it to work for defroster somewhat okay, had to paint in several layers, letting it dry in between.
It shows that it is important to write in a clear way and make sure the information is correctly presented.
This was my first computer!! So cool
Well this video answers a 30 year old mystery of when a computer store I took my Rev5 Amiga 500 could never get it to run a Kickstart 2.0 rom
Funny too is there is no easy to find answer to this problem even today -- knowledge is there but Google search results give mixed and unclear results.
I’ve repaired a few amiga keyboards. Yes there are a few options for membrane replacements. The one I favour is the “hard” membrane replacements, readily available in the UK, sadly I’m not sure of availability in the US.
But I’d try fixing first. Having removed the 40million screws (slightly larger screws around the pcb controller to watch for), remove the membrane, place on flat surface and gently wipe with water or if feeling brave some glass cleaner can work well.
Sometimes I’ve needed to refurbish the little plunger, some conductive
paint can be used (Liquiwire
50mL Electrically conductive paint for PCB & electric circuit repair from Amazon) is what I’ve used with success, dip the plunger into it and let dry. As you say Esc and F1 not working when the rest work usually points to plunger or dirt on membrane. Before going to the bother of getting the conductive paint, try swapping a couple of plungers around.
Hope this helps.
Great fixes. Another Amiga saved... well, mostly. I bet your Subaru doesn't corner as well as the Lotus Esprit. 😉
Cool !! Hello from Brazil !
Nice video as usual - I'm disappointed you didn't use the dremel on those torx screws :)
We've had rain for most of a week here in Texas, but no basements! The ground is wrong on one way or another for basements, but here it's limestone like a foot or two below the ground.
You had some bad luck with that revision 5 A500, A500 normally in good condition, except for Rev 8's, nice job!
I really could have done with something like that S-Video adapter back in the day. That combo of the 1702 and the A500 (rev5) was my setup. I used the colour composite out of the A520 modulator. Which was ok but slightly blurrier than I would have liked.
Indeed -- the S-Video was shockingly nice compared to the composite video. It certainly work but it means the high res text is a bit hard to read.
Look for broken traces on the keyboard membrane. Use conductive epoxy if you find any.
I fixed a membrane Sun keyboard with a trace repair pen.
Also, the older kickstart roms are a different size. There’s an adapter to allow larger roms.
On the flickering video check the two large caps near the video port. They tend to go bad and can short out. They will also over heat the resistors. I've had that occur on two of my version five boards
Naval jelly is basically phosphoric acid and a binder. Bilt Hamber makes the best alternative in Deox-gel. You can make your own using some sort of starch, water, and acid. Phosphoric is particularly nice on steel, because the phosphate it leaves behind is good at holding oil or wax for further protection. Citric acid is common and very mild and benign, leaving clear surfaces. Clean white vinegar is probably the most widespread stuff. Avoid Hydrochloric acid and chlorine like the plague if you care about metals in the room! See also: Parkerizing.
Thank you Adrian! I just got request to fix A500. So that might be helpful.
When the screen hits your cam, like a big swirly spam, that's a moiré
One thing I am going to miss about living in Portland is the rain.
After you repair a computer what do you do with it return it to donor or keep it or list it for sell? Really enjoy watching your repair videos on the vintage computers. Takes me back to a earlier time .
Always good value. Keyboard Membrane Repair, FWVLIW:
Just don't, you'll be much happier!
...but if you must, or just don't have an option: (nobody makes replacement membranes for my favourite retro system)
1) Find the schematic and test the leys.
This will likely tell you if the issue(s) is/are with:
-The connection with the with the computer (I hope you checked that first!)
-The controller or it's connections (hopefully the socket or dry solder joints, not the chip itself)
-One (or more) of the main row/column traces on the membrane (repairs are easier if any cracks aren't near the keys)
-An individual key or local trace(s)
2) Carefully disassemble the keyboard:
-Dry clean the key mechanisms and partially reassemble. If you're very lucky it was just guck / grit
-Brush down the outsides of the membrane ONLY and give it a gentle flap. Test again, maybe just a bit of grit / guck
-Being VERY CAREFUL look for any cracks in the FULL LENGTH of likely tracks by continuity testing and then magnification to find the exact spot(s)
-No clue? AMAZINGLY CAREFULLY push a FLATTENED cotton bud tip between the membranes where the key presses and GENTLY rub both sides
(It may be the pads have a bit of build-up that is preventing conduction, hopefully you shifted it without scrubbing off the usually very delicate film)
-If you found a cracked trace you can effect a repair with a product like Wire Glue, Silver contact paint, or similar...
a) It's amazingly important NOT to daub it on - claggy lumps ruin membranes. Whisker-thin dab, dry, test, more if necessary...
b) If the crack(s) is anywhere near a key actuation spot you are almost certainly NOT going to effect a successful repair, but try if you must.
Second last resort:
If it really looks like all the traces are good, it's just that the pads under the key(s) are worn out you may get away with the old drawing on the pads with a soft led pencil trick, taking care NOT to distort or scratch the plastic. If this works at all it probably won't last long. Alternately a very VERY thin layer of Wire Glue or similar might help. You can even try applying a small circle of gold leaf!!! (expensive, horribly fiddly)
Last (first?) resort:
You could design your own replacement keyboard PCB to interface with the old logic. Not as hard as you might think - there are online resources to help. Two options:
a) A PCB with SMT tact-switches or dome switches to go where to old membrane lived. If there's room, great. If not you may need to sand a little off the bottoms of the old key plungers - this will leave you with a seemingly authentic keyboard that's more reliable and a better action. Best to order a PCB thinner than the standard 1.6mm if you can, some manufacturers will even do flexible ones but they are horribly expensive and they aren't necessary. An awesome mod for the old rubber-key ZX Spectrum, but it works for many mechanical keyboards too. The old membrane will serve as a template for your layout.
b) A complete new mechanism using modern mechanical switches - more fashionable and possibly more robust and future-proof. But modding old keycaps to fit new switches is a bugger, as is finding new keycaps that look the part. Then there's the whole "Am I going to have to design / program my own controller too?"
I hope that helps someone.
Don't need those two keys for Lemmings so... win win!
Navy Jelly I was thinking belly button jelly LOL!
If the keyboard is anything like most keyboards with a membrane sensing mechanism, you should be able to separate the layers of the membrane and clean up whatever gunk is on there and use a conductive silver pen to redraw the traces. That's what those pens are actually designed for! Also useful for membrane flex connections that use that same silver trace material that can wear off. Make sure it's using paint and you let it harden completely. A rather easy fix honestly.
I like the hard membrane replacementa
I usually just disassemble the keyboard and clean the plungers and the membrane with windex. Quite simple to do and most often solve any keyboard issues.
Hello from Portland! I am currently working on my 500 rev 5. Hunting down a 1Meg Agnes and seemed to have lost the screws for the keyboard (replaced the membrane a couple of years ago) and the case.
I owned a C64, but never got an A500 as a teen. Still hoping for an A500 Maxi sometime. A MEGA65 would also be great, but the price is too high for me.
4:45 "Inside the computer's a bit of a musty odor so, this thing was obviously stored...outside..." LOL!
I had the same VIP video adapter and I too saw the interference when accessing the floppy drive, although to a lesser degree.
Oh interesting. I did try it on another A500 and there were no issues ... so I assume it's something on this machine. Perhaps it's a design issue on the Rev -5 board.
The last A500 I tried it with was a Rev 6a. It is entirely possible it needed some caps replaced.
Hi Adrian. There's something in the UK called JENOLITE Rust Remover Thick Liquid. Not used it myself, but it looks pretty similar to Naval Jelly.
Awesome -- that's good to know. I get asked from folks overseas what they can use that works in a similar way.
If I remember correctly those mitsumi keyboard membranes are actually single layer and there are rubber plungers which make a connection between 2 pads to register the keypress (in the same way as the c64 keyboard works). I'd be tempted to take the keyboard apart and check that the issue isn't simply that the rubber contacts on the bottom of the plungers are dirty for those two keys and hence are not making a good connection or that there isn't just a bit of fluff in there thats preventing those keys from making a good connection.
Ah I see -- so instead of a PCB like on the C64 they just put the carbon contacts on a membrane?
@@adriansdigitalbasement2 I think the samsung ones might be two layer, but yeah, I'm pretty sure the mitsumi ones are just contacts on a membrane. I'm guessing it saved commodore a few pennies. There are now aftermarket solutions where you can replace the membrane with a proper pcb solution instead. I've never tried those, so don't know whether its an upgrade or not though.
This exactly. Don't discount the rubber on the posts. I was given (5) A500 keyboards to repair and only one had a bad membrane but the rest had various keys that did not work and in all of those cases it was the rubber that lost its conductivity. Replacing them fixed all of them. If it does turn out to be the membrane you can purchase new replacements including a PCB version that uses a very thin PCB and gold contacts. I have used both solutions and they both work great.
I wonder how many different ram cards were produced for the A500… the one I had was ICD’s AdRAM 540, which consisted of the main board in the trapdoor bay, a small board that fit beneath the Gary IC, and a small ribbon cable linking the two. The truly nice thing about that card today is the battery backed clock ran on (I think) a CR2032 lithium battery instead of the dreaded NiCd battery.
If the membrane is dirty just split it apart at the F1 and Esc keys and clean the contacts with a pencil eraser first. If that doesn't work try a tiny bit of the carbon conductive paint. I actually used aquadag paint myself, I didn't want to spend the money for the membrane paint.
Rainy December?? We are in February!!
Alternate date keeping.... In the USA people do like alternate facts and maybe now also alternate dates 🤔😂🏳️🌈🏳️🌈🦆
Also it's only just February 😜
@@jantonkens9820 those people are a minority. In the US we have a glorious system where a minority of a minority can hold the entire government hostage. It's so fucking smart. Thank god our founding fathers knew that they couldn't trust anyone but the aristocracy.
He’s from the future
@@michaeldonoghue9015 Working on retro stuff before it's even retro
The membranes on the A600 and A1200 usually fail because of the wear and tear on the flat flex from moving, unplugging and reconnecting the keyboard to the motherboard. Since the A500 keyboard membrane is usually left attached to the integrated controller board it is more robust. A500 keyboards tend to be older than A600 or A1200 ones and the individual switches are a more likely point of failure through loss of conductivity. Repair should be possible with cleaning/conductive paint or replacing the key plunger with a spare from a broken keyboard.
I cry for the Amiga
The day was going straight into the toilet... but now, this video marks the day's turnaround! Heh
Naval jelly is phosphoric acid with a gelling agent.
I have seen some people having minor success using a conductive ink pen to repair connections on those type of membranes used in the keyboard, can't guarantee anything but it could be worth a shot.
What you call "Workbench" in the beginning is actually called "Kickstart" :-)
25:01 "You know what, this has got to be because this thing is running NTSC and I think it's designed for PAL" Hmm, that explains why it says "NTSC Will Fail" directly above it.
Need to point out that when making a video, I can't sit there for 30 seconds and read everything on a screen. That doesn't make particularly compelling or interesting videos......
Notification Squad! :D
A non-working key can be either a result of a faulty membraine (one path rotten - can be fixed with a conductive paint) but it also may be due to oxidation of a plunger - you won't know it untill you disassemble it.
I remember having a Workbench 1.2 Amiga 500 as a kid. It was also weird in that it could handle 1.44mb HD Floppy disks, I'm pretty certain they were only supposed to be able to handle DD disks. I do miss that quirky machine!
Probably only 720kb?
early A500 did ship with Kickstart v1.2. I had one. The only real difference was that you could boot from a HDD with v1.3. You could run Workbench 1.3 on the 1.2 rom, in fact there was a patch that would load at boot time that would fix a few bugs in 1.2. As for bootable HDD, it was still possible with custom boot ROMs. I had a GVP expansion box that included its own boot ROM that allowed me to boot from HDD with Kickstart 1.2. (It also had 2MB of fast ram). I later did upgrade the ROM to v1.3 and yes I had to have a tech install the bodge wires for it. I also upgraded it to the ECS Agnus that allowed 1MB of Chip ram (also software PAL/NTSC switching, for those rare instances I ran into PAL games). I was trying to remember if I actually had 1MB of chip ram (the 512k "trap door" cannot be used as chip ram, it's actually called "slow" ram..) but I'm not sure, I think I might have had the 512k ram chips desoldered and 1MB of chips installed on the board. So I had an A500 with 2mb of Fast ram, 1mb of chip ram, and 512k of "slow" ram... and a 30MB I think SCSI HDD. Pretty slick for an 80s kid.. though I would later upgrade to an A3000. That computer also came with a dual rom setup and a menu that let you boot into Kickstart 1.3 -or- 2.0..
@@VIC-20 880k
if it's a membrane of rubber domes... then I've done similar, since many game controllers and remotes use similar tech.
Typically, the membrane has a graphite patch in the center, which shorts across two exposed copper contacts when the key is depressed. Just like many game controllers.
If the membrane itself is intact, but the contact pad is bad, it's just a matter of affixing a suitably conductive substance to the contact patch. I've done it only on NES controllers, calculators, and a TV remote -- short term, graphite worked, but needed redoing.
Aluminum foil did not work - -the oxide layer isn't great.
Copper detailing foil did work. (Scaring me to think that was 30 years ago.)
Great video Adrian! Have you ever used that CLR Calcium, Lime, & Rust Remover stuff to clean contacts on any vintage computer?
I've only used it in my bathroom. I would worry it's too harsh on the non corroded metal parts of the machine.
@@adriansdigitalbasement2 Gotcha.
New membranes are available but not for the one which uses 2 ribbon cables AFAIK.
You can even get a 'pcb' type membrane instead of the original type.
It's well worth changing the two larger capacitors near near the power input jack, they're notorious for failing and causing issues when accessing disks.
Yeah I bet those caps are problematic -- it makes the most sense.
Re: Keyboard. With the Mitsumi keyboards it's often not the membrane that's the problem. Instead it's the carbon impregnated rubber on the bottom of the stems. This will often oxidise and become non-conductive if left in a damp environment. You can buy carbon paint, often sold for garage door remote button and remote control button fixing to get them working again.
Yeah sounds like it's similar to the Mitsumi plunger style keyboard used the PET and C64. I have strategies for refurbishing those like the paint -- so I'll need to try it on this.
I had a Rev5 Amiga, and when I replaced the Kickstart ROM with 1.3 It did not require any bodgewire for my system. The only issue it seemed to have was a serious problem with my 3rd party bootstrap ROM for my 20MB HDD, it would hang for up to a minute on a gray screen before booting from the HD. I ended up just booting Workbench from floppy and using the HD as storage until I sold the whole thing to help finance my first PC in 1992.
The issue is 512k roms like 2.0 and higher as well as using eeproms on rev 5 boards.
Right ok -- couldn't recall is 1.3 was 512k or not -- so yeah any 256k ROM would be fine on that system.
@@adriansdigitalbasement2 1.3 was just 1.2 with bug fixes like working autoboot from hd.
Naval Jelly will attack paint and galvanized metal...so use with care. I've used it a lot for car stuff.
Any time Adrian is about to put something in a socket that's suspect, I always say "DEOXIT THAT SOCKET!" and pray he says the words. They're the magic words, if you don't say it, the computer never works guaranteed.
Adrian I can't remember if that model has the audio output reversed caps on the motherboard that need to be changed I think it was all the 500 models.
There exist a silver, that can be used on these membranes, to recreate the circuits on these membranes. So the contact will be as new.
I used silver conductive paint too on my rev5 keyboard years ago to repair some traces. I remember detecting them by looking to the membrane in front of a lamp, then you see clearly the gaps on some traces. I have tried a chinese copper conductive pen but didn't work for me, only my old silver paint did the job.
It's important to remember that S-Video is *not* the same as the Y/C input on the monitor you're using. It operates at a lower voltage on the chroma pin. To bring it up to standard for your 1702/1084 you'd need a small amplifier on the chroma circuit.
It may be slightly different voltage but it seems like the analog circuits are super forgiving. I've certainly never had any issues with the color decoding circuit on that monitor when used with modern S-Video devices. I think the reason is the color decoded uses the amplitude of the colorburst as a reference -- so the higher or lower voltage the whole chrome signal is doesn't have much of an affect as the relative change is the same between the color information and the color burst.
You could try some method of cold soldering, aka condutcive glue, to fix membrane if trace went bad, but it could be just dirty.
Only way to find out is disassemble it and take good look, im affraid.
LOL, the Lotus weighs about 1,300 pounds less than (65% of) your Subaru Forester XT.
Colin Chapman (founder of Lotus) philosophy: "Adding power makes you faster on the straights. Subtracting weight makes you faster everywhere." Just sayin'. ;-)
Because you had Kickstart 1.2 it would had been interesting to see the label underneath. Most likely a 1987 model. I bought mine 1988 and am pretty sure had Kickstart 1.3 right away.
For Test Drive. Yeah, HP of Porsche, Ferrari and others are ridiculous today. But prices too. Don't think you get a new 911 for 50K these days.
Also the game was made in Vancouver! Yay Canada! I think I had it back in the day, but never noticed it was made in British Columbia.
Although I think 50k back then is worth about $122k now -- so that seems a bit more comparable? And considering a Porsche back then had basically no technology -- it's rather surprising really! As for the year, I don't recall seeing any dates on that machine -- I have never come across a motherboard that didn't support 512k ROMs.
@@adriansdigitalbasement2 I liked cars back in the day when they were cars. Today they are computers on wheels. Thus I don't mind prices of Porsches or Ferraris today as I'd never buy one.
For the date I also tried to stop the video when you showed to board, but never could see any. There seems also no mention of the year on the label at the bottom.
Btw. a (rich) friend bought an Amiga 1000 in early 1986. While paying an arm and a leg, it ran Kickstart 1.1. First time I used a mouse when I came for a visit.
Greetings from your birth town at -27 C.
About audio, only from A1200/600 you have mono sum on the RCA. Original models 1000-500-2000 are stereo only
Ok yeah I recall the manual for the 1084 (mono) saying to use a RCA combiner to make it mono. Nice improvement they did it right on the motherboard on the later machines.
I wonder if you should keep one of your low cost oscilloscopes connected to a video cable, for better "sign of life" testing than various video digitizers.
For what it’s worth the lid of the ifixit case is good for holding screws
to fix the keyboard problem, you have to disassemble it and use silver contact paint and repaint the traces.
If you're using the Diag rom, why was there no null modem hooked up to capture the output?
I had an Amiga 500 a couple of years ago where some important key was not working and it had a plunger type thing that I moved over from a less important key. I don't know what type of keyboard that was, cleaning didn't help with those plungers.
I'm guessing it was stored vertically with the left side down, so any/all water(?) corroded that connector and plating parts. Possibly also the ESC and F1 key issues?
Oh yeah it's on the same side as the corrosion ... strange is this machine was inside a box and packing foam, and the box is in OK shape. So I don't really get where the corrosion came from.
Every time I see you waving your hands on camera when the rest of you isn't in the shot reminds me of the end of Svengooile when all you see the waving hands of the guy at the door telling bad jokes
Of course you drive a Forester and live in Portland what else could it be. Just remember the cool kids drive vintage Elements.
Heh. I need my boost so have a Forester XT. :-) A friend of mine who's also into retro stuff did just buy an Element SC though. He's really excited about the hauling potential
24:00 does it have a setup Mode where you can force it into ntsc?
a total stranger to cellars I would like to learn more about the sump pump. Is it catastrophic if it fails while raining for days. And havent seen rain for ages so would like to see that too
I don't think so -- the house would have never had one for almost the entire life of the house (it's over 100 years old) but it just means you might have a little water from time to time. I have a triple sump with redundancy including battery backup, so it's much less likely to have a problem than a single pump which most people have. The sump pumps just sit in a big hole that is deeper than the concrete floor. so any water will collect there first and it gets pumped out and into the garden.
@@adriansdigitalbasement2 interesting, so it seems the addition of the sump pump is extra measrues to keep things extra dry
Yeah the rains are getting more and more intense. Here in NC we've started having more thunderstorms in the winter which is weird. IIRC we've always had them but not as frequently or as heavy.
Huh... what are the odds? I own that exact same toolset. It's really handy.
I've never seen such a small and neat Amiga power supply, I want one! There seems to be some sort of shortage, as I'm having to do a mean well power supply conversion as I can't find anything else under like 80 dollars and they're all still big and ugly.
Ah I forgot the name of this, but if you google for Amiga power supply you'll find it. They make similar ones for other retro machines like the C64 and what not.
Fun fact the mono composite is generated by video hybrid circuit
Naval jelly is phosphoric acid.
No wonder you have to be careful to fully wash it away!
I'm sure I heard you wrong, but it sounded like you said the Amiga 500's video output was monochrome? I seem to remember full color graphics when I had mine plugged into the monitor.
It is full color if you are using the 23 pin RGB port but the composite video port built in to the A500 only outputs monochrome, hence why Commodore marketed the A520 TV modulator for the A500. Why they made the built in composite mono only is a mystery for the ages but typical crazy Commodore decision making.
@@jhfgjtjutyiuod Ah, I always plugged it into a monitor so I never noticed. It does beg the question of why they did it that way. I _hope_ the only reason wasn't just so they could sell an extra adapter, but I wouldn't put it past them.
Is there a Control+key combo you can use as a temporary substitute for the Escape key, like Control+[ on early IBM and Apple machines?
No don't think so -- the Amiga is like the PC and uses scan-codes. (And not ASCII like on the Apple II.) So programs look for specific scan codes and you only get that from pushing the actual key.
@@adriansdigitalbasement2 Ah, good to know. It was just a wild guess on my part, having background on other stuff, just not Amiga, though.
Definitely go with replacing the keyboard membrane, once you start chasing issues with them things, they just create more problems, var easier in the long term to just swap it out and have a nice working keyboard... :)
There are membranes available. I still have one laying around.
Let me know if you need one.
Thank many people have left comments on how to take it apart and clean it -- so I'll try that first
Having a double size ROM with the largest address pin floating isn't much of a problem if you just write the ROM binary in there twice so that both halves of the memory have the same content.
Not sure how it is with ROMs, but with microcontrollers, leaving an input pin floating can lead to excessive current consumption.
Yeah would work OK if you're using a small ROM image. Can just add a pull up resistor to the pin easily enough too.
Which video output was monochrome? I remember hooking my A500 up to a 1084 with full color (the 23 pin connector?).
Composite video jack on the A500 and A2000 is monochrome, so to get color you use to use a RGB monitor via the 23 pin connector or use a color encoder like the Commodore one or something like this VIP device.
@@adriansdigitalbasement2 Great, thanks for clearing it up. 👍
So there was orange juice spilled on the ESC/F1 region and ran all the way down the CPU connector to the green and rusted screws🧐
Would certainly explain things -- there was no evidence of crusty dried juice but who knows. Maybe someone cleaned that up a bit.
Try the stuff the 8 bit guy used on the contacts of his commodore pet keyboard
Adrian if i was you i would make an adaptor for the eeprom from a chip socket with the modification on the socket so as not to mess up the diag rom
Some Amiga shops (Sordan Electronics I know for sure) sell ready-made adapters for using EEPROMs in the Rev. 5 Amiga boards. Although the A500 I got off eBay a few years ago was upgraded to Workbench 2.04 but they had to tie some of the legs of the ROM together with thin wire to get it working in the Rev. 5.
Adrian, how did you boot from the external gotek drive?
Kickstart 2.0 and later is able to do that. A lot of older games have an issue with that though, and will fail to work right as they are expecting to be in DF0.
Please let us have a glimp inside this vip interface :)
I am a bit confused.... In have always believed that the A500 had an RGB port built in and connected directly to a 1084 monitor, with color.
My wife had both when we met and we played tons of great games on it. But it sounded like Adrian said that the A500 was monochrome without the adapter that he was using here.
Edit: yes. He said that both the 500 and 2000 only had monochrome as native output. But I feel pretty sure that this is not true. Anybiy else able to confirm?