Coking Plant, Zeche Zollverein, Essen

The Ugly Duckling

One year or so after I got my Amiga 500, I extended it with a GVP Impact Series II A500-HD+ SCSI host adapter and a 45MB harddisk. It retired together with the Amiga 500, and was stored in the basement for decades. But while the Amiga survived the years in a surprisingly good state, the GVP had suffered from the moisture. The case was yellowed, but also got mold stains, and the metal frame got some flash rust.

Dirty, yellowed, mold stains, rust at the bottom frame… This poor device has suffered from storage.

All in all, it seemed to be in a bad shape that was difficult to restore. But on the other hand, it would be sad to write off this nice piece of hardware, while all the other Amiga stuff got a general overhaul.

I sent the case to the CBM Museum Wuppertal for cleaning and whitening. It was a bit embarassing to send it in that bad condition, but they said it can be cleaned and will then look as good as new. Let's see if they can do miracles.

Flash Rust

The base frame had a lot of dirt and flash rust from the storage, especially in the areas that are frequently touched. I used some Nigrin car metal polish paste to clean it, but probably every kitchen metal polish would have done the job as well. It was a bit of work, but after that it almost looked as new.

A lot of flash rust, fingerprints, and dirt. After applying a metal polish, it was a lot harder to make a photo. 😄

Self-Powering

There have been two things that were always annoying me on this controller. One was the tiny fan that was supposed to cool the harddisk, but produced a lot of noise. The other one was that a separate external PSU was needed to power the harddisk.

I always wished that the controller would just source itself from the Amiga, but it was clear to me that the mechanical harddisk was drawing too much power for that. The original Fujitsu drive consumed about 10W! With a SCSI2SD adapter, the power consumption is considerably lower, so a self-powering is feasible. The SCSI2SD V5.2 adapter draws only about 10mA, or 0.05W.

The controller can easily be modified to get its power from the Amiga. There is a blog post by davem2 explaining it. All one needs to do is to bridge the CN5 and CN6 pads with some solder.

The CN5 and CN6 bridges enable powering from Amiga. The controller's PSU must not be connected after the modification though.

Since the SCSI2SD adapter also does not need active cooling, I could finally keep the loud case fan disconnected for good.

After the modification, make sure never to connect the GVP PSU to the controller again. It would power the Amiga via the card connector, which is very likely to cause damage to your hardware. Also, do not use mechanical harddisks after the modification. If you want to keep using the original PSU instead, you should let a technician check it first.

Firmware Upgrade

By a lucky chance, I found the latest firmware v4.15 in Ralph Babel's Amiga archive. By another lucky chance, I also found a 27128 EPROM in my spare part box that was once stripped from an old mainboard.

The original firmware would have worked fine as well, but if there is an opportunity for a free update, why not take it?

A firmware update after 30 years!

If you should use a 27256 EPROM instead, make sure to burn the image twice, as only the upper half of the memory will be accessed by the hardware.

Final Works

As there are no electrolytic capacitors on this board, there is no need for recapping. I still did a minor modification: I replaced the LEDs with blue (power) and red (disk) ones, as it became a kind of signature color for all my computers.

After that, I gave the board a thorough bath in IPA, and cleaned the edge card connector with a contact cleaner.

The PCB is nice and clean again!

I also found two 1MB/70ns 30-pin SIMM modules for a few Euros on the Bay, so I could double the available Fast RAM to stunning 4MB in total. (Remember to change the jumpers accordingly, as there is no automatic detection.)

Reassembly

Meanwhile the CBM Museum Wuppertal had returned the cleaned and whitened cover. They did an excellent job! The case looks almost as good as new. The mold and dirt stains are gone, and the whitening brought back the original "Amiga beige" color.

The cover was cleaned and whitened successfully.

As the SCSI2SD adapter is delivered without any kind of mounting frame, I had to 3D-print one myself. Unfortunately it collided with the case fan, so eventually I just removed it completely.

The SCSI2SD adapter on its mounting frame.

And that's it. The GVP harddisk controller is reunited with its Amiga 500 again. I am sure they have missed each other. 😉

Don't they look happy?

The ugly duckling finally became a beautiful swan again!

Amiga 4000 Restauration, Part 2

In the first part, I took the Amiga apart and repaired the main board. In this second part, I will take care of a new PSU, and then I will put the system back together.

New PSU

There are also capacitors in the PSU that dry out over the years and need to be replaced. But as I'm not a trained technician, I keep my hands off all kind of hardware as soon as mains power is involved.

Surprisingly, a standard SFX form factor PSU perfectly fits into the power supply opening at the back side of the Amiga case. Even the two screw holes of the case match perfectly, almost as if the SFX form factor was just invented for that purpose. There is sufficient space below the PSU for the fan to transport the warm air from inside the case to the outside. There is also enough space for the longer SFX-L form factor. Most of them use a silent 120mm fan. All it needs is a frame where the power supply can sit on.

Not all SFX PSUs are suitable for the Amiga though. The reason is that in modern PCs, the main load is on the 12V line, and there is also a 3.3V line. The Amiga however has its main load on the 5V line, the load on the 12V line is neglectible, and the 3.3V line is not needed at all. Most modern PSUs are regulated on the 12V line. If there is too little load on it, the other voltages may become instable. In best case, the Amiga will then just crash. In worst case, its hardware will be damaged. There are experts who generally advise against using PC PSUs as a replacement power supply, so let me give some warnings before I go on with the article.

WARNING: I recommend to keep the original Amiga PSU, and have it restaured by an expert. Using a different PSU may cause permanent damage to your Amiga, possibly years after the modification. Self-made power adapters can damage your Amiga if incorrectly wired, and may even cause a fire if underdimensioned or short-circuited. You reproduce the following modification at your own risk. If in doubt, keep using your original Amiga PSU.

The original Amiga 4000 power supply has a maximum load of 145W. Even the smallest SFX PSU is able to deliver far more than that, so basically you can choose any PSU which provides at least 90W (18A) on the 5V line. Still the actual choice is very small. Firstly, the PSU should generate the 5V by a separate DC/DC converter, so the voltage is stable even if there is almost no load on the 12V line. Secondly, the PSU fan needs to be active all the time, as it is the only fan in the Amiga that transports the warm air out of the case. Many modern PSUs have a hybrid fan control though, and operate in a passive cooling mode on low load conditions.

For my Amiga, I use:

  • A be quiet! SFX-L Power 500W PSU. According to the manufacturer the 5V is generated by a DC/DC converter, and all supplied voltages have a required minimum load of 0A. Also the fan is permanently operating, but still almost inaudible. Some of the connectors of the modular design collide with the power switch, but that's not a problem unless you plan to use more than three drives.
  • A 3D printed SFX adapter frame.
  • A Canal PSD-1 power switch. They are not manufactured any more, but can still be found at online marketplaces. If you cannot get one, you can also take the one from your original PSU. (Do not open the PSU case, but ask an expert to remove it for you.)
  • An ATX to Amiga power adapter. I made one myself using an "ATX to Acer 12-pin" power adapter, a TE Connectivity Mate-N-Lok 6 circuit plug that is still available today, and a crimp tool. Some Amiga shops also sell readily assembled adapters.

To build the power adapter, the wires need to be connected between the Amiga power plug and the corresponding pin of the ATX power connector. The PS_ON# and one of the COM pins are connected to the power switch. All wires should be sufficiently dimensioned.

Pinout of the Amiga 4000D power connector.The self-made ATX adapter, with two extra wires for the power switch.

When everything is assembled, make sure (make double sure, make even triple sure) that the wiring is correct, but do not plug the connector into the mainboard yet. Now press the power button and check the voltages. PWR_OK should have 5V, but it may flutter or even be 0V because the PSU has no load right now. The other voltages must be correct and within a tolerance of 5%. Keep the test short, as it may stress the PSU.

For the first live test, I removed the CPU module, the SIMMs, and all Zorro boards. The Amiga won't boot like that, of course. But if something should go horribly wrong, the damage would be limited to the mainboard only (which is still bad enough).

The ATX cable and adapter cable is zip-tied to the frame.The PSU is seated on the frame. Everything is ready for a live test.
 I blurred the label because this PSU model has a hybrid fan controller and thus cannot be used here.

Then I turned on the power, for the first time in maybe 20 years. The power LED lighted up. There was no smoke, no smell of burnt electronics, all the chips stayed cool. I checked the power lines, and all voltages were within the expected range. This was looking really good! I turned the power off again.

Now I was confident enough to remount the CPU module and the SIMMs. I also inserted a scandoubler, and connected a monitor to it. Then I turned the system on again. And a few seconds later, I got a picture.

Alive again! The picture quality is poor because the signal is out of the monitor's range.

I was probably never that happy to see the Amiga boot screen! 🥲

I had invested some money and many weekends into the refurbishment project, with unknown outcome. All the patience finally paid off.

Reassembly

The old mechanical hard disks were loud, slow, and produced a lot of heat. Since I want my Amiga to be as silent (and modern) as possible, I decided to use a SCSI2SD hard drive emulator instead. Alternatively, an IDE to Compact Flash adapter can be connected to the internal IDE header.

Besides that, I only left a floppy disk drive in the drive cage, but maybe I'm going to replace it with a Gotek floppy drive emulator later. The minimalistic equipment and the modular design of the PSU gives a clean and tidy look on this side of the case. It is also good for the ventilation.

Everything is wired back together. Only one of the PSU's three drive power connectors is accessible, but that's sufficient.

On the other side, the freshly recapped MaestroPro and Toccata sound boards have already moved back to their Zorro slots.

From top to bottom: MaestroPro, Toccata, Scandoubler. What's still missing is a ZZ9000 for HDMI graphics and Ethernet.

Let's have a look at the outerior. The CBM Museum Wuppertal did an excellent whitening job again. The keyboard looks as good as new, and the outline of the old sticker on the front is almost invisible now. The paint shop did a good work as well, the cover now looks almost brand new.

Isn't she a beauty again? 😍This is how it started. (The sheet of paper is for white balancing.)

I've tried to use my original Workbench installation from the 1990s, which I kept on using in an UAE emulator after that, but it was too messed up and crashed the real Amiga while booting. Finally I gave up and installed a fresh Workbench 3.2 from scratch.

What is still missing is a ZZ9000. It will serve mainly as a HDMI graphics card and Ethernet card. After that, my good old Amiga 4000 is ready for some serious Amiga programming again. 😉

Kudos

A refurbishment project like this is not possible without the help of a number of people. First of all, I want to thank the members of the A1K.org Amiga Board, especially halbvier for organizing the rare parts that I needed for the RTC repair. I want to thank the people of the CBM Museum Wuppertal for carefully whitening the plastic parts, and for the nice talk we had. I also want to thank Jan Beta because his YouTube channel inspired me to refurbish my two Amigas.

This project is dedicated to my brother Robert, who had taught me how to solder and how to repair old hardware. I miss you.

Amiga 4000 Restauration, Part 1

A few years after I got my Amiga 500, I bought an Amiga 4000 from the pay I got doing my civilian service. At its peak, it was housed in an RBM Big Tower case, and had all kind of expansion cards and an 68060 accelerator board. It was my pride and joy. Later, after Commodore went bankrupt, I switched to Linux systems. My Amiga 4000 was put on a diet and moved back into a desktop case.

The restored Amiga 500 is meant to be used for playing old games and watching demos. In contrast to that, the Amiga 4000 is supposed to become a workstation again. It should be connectable to modern monitors, and should be as silent as possible.

This is the state of the case before restauration.

The "before" photo. The front panel has clearly suffered in the past 30 years.

The computer has suffered a lot in the past decades. The powder coating of the metal cover got a lot of deep scratches from CRT monitors that were placed on it. The plastic front got a deeply yellowed tint. To make things worse, there was a sticker on the front that kept the plastic from yellowing, but now the outline is permanently "burned" into the front instead. The keyboard was in a similar state, although not that badly yellowed.

The CBM Museum Wuppertal already did an excellent job with whitening my Amiga 500, so I decided to also let them whiten the front panel and the keyboard. The experts at the museum warned me that the logo might stay visible after whitening though, but then I could still resort into dying the front black, or even 3D print a new front.

Meanwhile a paint shop is taking care for repainting the metal cover. I decided to keep the original color, RAL 7044 (silk grey).

Let's have a look at the inside now.

Leaked Battery

A true Amiga killer is the NiCd battery that serves as a power backup for the RTC. Sooner or later it leaks and spills battery lye onto the PCB. The lye corrodes the components and traces in its vicinity. If untreated, the board can become irreparably damaged over time. When I first heard about the problem eight years ago, I immediately cut out the battery, but sadly it had already leaked.

The leaked battery, before removal.

For the restauration, I needed to repair this part of the PCB. I generously removed all affected components. Then I neutralized the lye with vinegar essence, rinsed the area with water, then cleaned and dried it with IPA. After that, I used a fiberglass pen to remove the solder mask down to the bare copper, to have an unobstructed look at the damage.

I lost two pads that seemed to be too damaged by the lye. They just came off while I was cleaning the board. Luckily one of them was not connected, and the other one could be replaced with a short piece of wire.

After that I rang all the traces. Three of them were open and also needed to be fixed with a piece of wire. I then used solder to tin the bare copper traces and protect them from corrosion. Finally, I soldered in fresh components.

All affected parts generously removed, and the PCB scrubbed down to the bare copper.The bare copper was tinned to protect it from corrosion. I also had to fix some open traces.Fresh components soldered in. One lost pad was fixed by a wire.

The lye may run to the bottom side through the vias, so it should be checked as well, and repaired if necessary. Luckily I could see no damage on my board.

Since the old rechargeable battery almost killed my Amiga, I decided to use a 3V button cell for backing up the RTC. To prevent the cell from being charged when the power is turned on, I replaced R179 with a standard diode.

Since I removed the crystal and capacitors, the RTC needs a recalibration. I connected pin 17 of the RTC chip (U178) to a scope, and then used a plastic screwdriver to adjust VC190 until the measured frequency was exactly 32768 Hz.

Recapping

Electrolytic capacitors may leak, similar to the battery, and it is recommended to replace all of them with modern premium caps. Some people replace them with ceramic capacitors. They cannot leak, but may have other disadvantages. There are good arguments on both sides, so it's a decision that everyone has to make themself. I decided to order the premium capacitors from my Amiga 4000D Bill of Material list. They are made by Panasonic and have an expected lifetime of up to 10,000 hours, which is maybe the tenfold of the original caps. They are also certified for temperatures of up to 105°C, which further extends lifetime.

There are different ways to remove the old electrolytic capacitors. The recommended way is to use two soldering irons, or a hot air rework station. I decided to use a different method that I read about, and twist them off with pincers. It worked surprisingly well, and it took only a few minutes to remove all the caps. To avoid causing damage to the pads, care must be taken that the caps are only slowly twisted, but not pulled from the board.

On the Amiga 4000 the leakage usually starts in the "audio corner", where many SMD caps are concentrated on a small space. I was lucky because all the caps were still intact there. On my board, C317 has leaked though. It was visible by the corroded solder joints around it. When they were heated, there was also a typical telltale smell of microwaved fish. Again, I generously removed the components around the damaged part, cleaned the PCB, and soldered in new parts.

C317 has leaked and corroded the surrounding.All affected parts removed, and the PCB cleaned up.New parts soldered in, with a bit too much solder though. 😅

There are also a few axial caps on the daughterboard. They usually don't tend to leak as easy as SMD caps, but since we're on it, they should be replaced as well.

When I repared the battery damage, I also had to remove two of the SIMM sockets. The original sockets have plastic brackets that easily snap off, so I decided to finish what I started, and replaced all five sockets with new ones having metal brackets.

In a final step, I washed the board with IPA. It was then repaired, cleaned, and ready to be put back into the computer case.

The restaured mainboard. It won't win a beauty contest any more, but I hope it is working again.

In the next part I will take care of the power supply, and I will put the system back together.

Amiga 500 Restauration, Part 3

After the test run was successful in the previous part, it's now time to put my Amiga back together.

Whitening

I've got the case parts and keycaps back from whitening at the CBM Museum Wuppertal. And the mandatory before-after photos proove that they did a great job:

Before whiteningAfter whitening

Sadly the PSU case is made of a cheaper material, and could not be whitened any further without risking the dreadened "nacre effect", so it stills look a bit yellowed. (I forgot to use a ring light for the photos, but I did my best to make both pictures comparable.)

Removing the Rust

Due to my careless storage in the cellar, the metal shielding got a bit of rust over the years. I removed the worst rust spots with a fiberglass pen. Then I polished the shields with Nevr-Dull wadding polish, which removed a lot of the rust film. The result is still far from perfect, but it's hard to impossible to restore the original look of the shielding, so I decided to keep it that way.

The upper shield after removing the rust and polishing.

PSU

I have already prepared the PSU in in the last part. Now that I also got the PSU case back, it's time to put it together. I've first replaced the power switch, as the old one got broken over the years. Luckily it's a standard switch that can still be found at electronic shops.

The RT-65B in its new housing. The photo shows an early attempt with swapped mains and power cables.

The Mean Well RT-65B fits into the case surprisingly well, almost as if it was made for it. I only had some difficulties to find a proper position for the wires. I tried different positions, and also tried to switch the sides of the mains and Amiga power cables.

The best result seems to be the original orientation of the cables (mains cable at the side of the power switch). With a bit of tweaking, I could finally route all the wires properly, make the RT-65B fit in, and close the PSU case.

I recommend to check the correct wiring (especially of the earthing) and the voltages once again. Also make sure that the terminals are firmly closed, and that no wires are overly bent, squeezed, or punctured.

GOEX Drive

The GOEX drive optionally comes with an OLED display that sits on top of the Amiga case and shows the currently selected file, and the current disk track. I can really recommend to order that display with the drive, as it makes selecting a file a lot easier. Unless of course you use the "GOEX on pills" version that offers a disk menu on the screen as OSD, but I wasn't sure how this version would interfere with the RGB-to-HDMI converter I am using.

The display is readily assembled, and already has crimp connectors at the end of the cable. The idea was to push them through an opening of the ventilation grille, but they just were too big for that. I had to cut them off, push the ribbon cable through an opening, and then solder new connectors to the cable.

HDMI Connector

Next problem was the HDMI connector. I use c0pperdragon's RGB-to-HDMI converter to connect my Amiga to a TV or monitor via HDMI. But where should I put the HDMI connector so I can reach it from the outside of the case?

My original idea was to cut a matching hole into the back of the Amiga case, but later I dismissed the plan and decided against disfiguring the case even further than I already did in the 1990s. A better idea was to print an expansion port cover with a hole for a HDMI cable, even though I disliked the thought that a cable would then loosely hang out of the case.

Then I noticed that the GOEX drive left a hole where the floppy drive's eject button has once been. And this hole is actually big enough for a HDMI connector, almost as if it has always been meant for that purpose.

The HDMI connector fits amazingly well!The holder frame (white) sits within the frame of the GOEX drive (grey) and does not need any screws.

I designed a 3D printed frame that holds the connector of a Delock 85463 panel-mount HDMI connector. You can find the STL file at the prusaprinters community for reprinting.

It looks a bit weird when a HDMI cable is plugged into that place where once the disk eject button has been, but it is working amazingly well, and saved me from cutting further holes into the Amiga case.

Completed

Now everything was mounted in its place. I couldn't close the upper shielding though, because the HDMI converter is in the way, so I decided to leave it out.

Everything is completed and in its final place.

And that concludes the restauration project. Welcome back, Amiga 500. With this hardware upgrade, you should be fit for at least the next decade.

Welcome back, Amiga!

The Kickstart Dilemma

Well, not quite. There is a Kickstart 2.04 ROM installed in this Amiga, and while playing some old games, I found out that a surprisingly large number of them crash on that version of the AmigaOS. It was indeed a big problem of the Amiga back in these days. In the previous generation of home computers, the operating system was static and was never updated, so programmers assumed to find certain routines at fixed positions. When the Amiga got popular, programmers continued to use the operating system like that, ignoring documented rules. Then in 1990, Commodore released Kickstart 2.0, a major AmigaOS upgrade. And suddenly, many poorly programmed games crashed, but instead of the programmers, the Amiga was blamed for it.

I still have an original Kickstart 1.3 ROM here, along with a ROM switch. Maybe I will use that board again. Luckily, I haven't yet closed the holes that I once drilled into the case, so I can use one for the switch again.

Amiga 500 Restauration, Part 2

In the first part, I dusted off and checked my old Amiga 500. I've also ordered all parts for the project, and they have been delivered by now. Let's start with the restauration!

Recapping

All home computers of the 1980s and 1990s have been designed for common households, and thus had to be cheap. Commodore did not expect that the Amiga would become an "old dame" some day, so they used standard components. A common problem is that electrolyic capacitors dry out over the years, losing their capacity. Some may even leak and, in worst case, damage the board. So the first restauration step is always to replace all electrolytic capacitors, even if they should still look fine.

As I don't want to repeat that process in a decade or so, I ordered premium capacitors with an expected lifetime of 10,000 h, which is probably tenfold of the standard caps' lifetime. At the bottom of this article, I have listed all the caps on my Amiga 500 Rev 6A board.

On the first sight, all capacitors seemed to be fine. Still, after removing one of them, I found traces of dried electrolyte on the board and at the bottom of the component. It really shows that a superficial inspection can be deceiving.

I also removed the wires of my self-made NMI button, and looked for cold solder joints and other potential problems. As final step, I carefully washed the mainboard with IPA.

Recapping completed!

HDMI Output

Let's start with the next construction site. As it gets more and more difficult to find TVs with a SCART connector (and I never liked them anyway), I want to connect my Amiga 500 via HDMI. Luckily there is a project by c0pperdragon that adds a pixel-perfect HDMI output to the Denise chip. The converter cannot be bought at shops, but you need to assemble it yourself. It consists of a few standard components that can be bought at good electronic shops, while the board can be ordered at PCB manufacturers. The assembly requires some fine-pitch SMD soldering though. If you don't feel comfortable with that, you maybe find a private seller for a readily assembled board.

To install the adapter, the Denise chip is removed from its socket first. Then the adapter is placed into the socket, and Denise into the adapter. A button can be connected for changing the configuration and taking screenshots, but that is not really required for operation.

The RGB to HDMI adapter. Denise is already plugged in, but the Raspberry Pi Zero is missing.

The RGBtoHDMI firmware needs to be extracted to a FAT formatted MicroSD card. Make sure to use release 20210322_f771e51 or later. Earlier releases will not work, but only show four colored rectangles.

Finally the Raspberry Pi Zero is plugged into the socket. Be very careful here! The pin header will also fit if not aligned properly, and may then damage your Raspberry or (even worse!) your Amiga.

It's easy to make a mistake here, so be extra careful that the Raspberry is properly connected.

New Power Supply

In the first part I found some liquid at the bottom of the power supply's PCB. I suspected it was capacitor liquid, but my contact at the CBM Museum Wuppertal explained me that it was just a lot of flux. Still, the old power supply would need a technical overhaul, which I can only recommend to people who know exactly what they are doing.

WARNING: Switched power supplies may still contain high voltages hours after they have been disconnected from mains. I strongly advise against attempting repairs yourself. If you decide to keep your old PSU, please ask a trained technician to restore it for you!

As I am not "trained personnel" myself, I decided against restoring the original PSU, but for replacing it by a Mean Well RT-65B. It has sufficient power, and also fits nicely into the original Amiga PSU case.

Before I removed the wires from the old PSU, I took notes on what color is connected to what voltage. Then I removed the wires, put crimp shoes on the wire endings, and connected them to the corresponding output of the new PSU.

My original PSU had a separate SEN wire. It is connected to +5V at the power plug, and is used so the old PSU could compensate wire losses and provide exactly 5V there. The replacement PSU does not provide a sense connector, so I just connected the SEN wire to the +5V line to increase the total cross-section and reduce losses, but it can also just be left open.

The "shield" wire must be connected to earth.

ATTENTION: There were different variants of Amiga 500 power supplies on the market. Your number of wires, and the wire color code, may be different. Do not just rely on my photos!

This is how it looked like after the wiring:

Mains power below, Amiga power above. Shield is connected to earth.red: +5V – black: ground – brown: +12V – white: -12V – yellow: +5V sense. Your colors may be different!Amiga 500 power connector pinout.

Do not connect your PSU to mains yet! First switch your multimeter to continuity test mode, and test if your earthing is connected to the PSU case, and to the shield and the shield pin of the Amiga power plug. After that, test if the power lines are properly connected. Now you can power up your PSU, and use your multimeter to check the voltages at the Amiga power plug.

ATTENTION: Please be very careful when you test the PSU outside the case. Make sure you cannot accidentally touch the live terminals. Also do not open the shielding of the PSU.

Test Run

After I made sure all voltages are correct, it was finally time for a first test run.

As I don't have many disks any more, I had ordered a GOEX drive as a replacement for the original floppy drive. It emulates a disk drive, but uses ADF files from a SD card. It even emulates the mechanical noises of the head stepper motor, which actually sounds much better than expected. I connected it to the floppy header of the mainboard, and used a cardboard box to make sure it won't cause short circuits.

Then I checked everything again. Is the mainboard okay? Is the HDMI converter properly connected? Is the GOEX drive connected? Is the Raspberry properly seated and the MicroSD inserted? Is nothing there that might cause a short circuit? Is the PSU protected against accidental touching the live terminators?

And then, after almost 30 years, it was finally time to wake up my Amiga 500 again.

My test setup, as the case is not here yet.My Amiga is still working! And a quick hardware test also shows no damage.

I first booted an Amiga Test Kit disk and checked the RAM and the CIAs. After that, I ran some demos. The picture quality of the HDMI converter is stunning!

Meanwhile I also got the case and keyboard back from the whitening service. I cannot wait to put it all back together, and enjoy my shiny new Amiga 500.

Capacitor List

The caps list of my Amiga 500 Rev 6A, and the replacement parts I used:

Qty Type Reference Manufacturer Number
2 3300µF 10V C401 C402 Panasonic EEU-FR1A332
1 470µF 16V C307 Panasonic EEU-EB1E471
6 100µF 16V C811 - C816 Panasonic EEU-FR1E101B
2 47µF 16V C821 C822 Panasonic EEU-FR1H470B
4 22µF 35V C303 C304 C324 C334 Panasonic EEU-FR1H220
2 10µF 35V C306 C712 Panasonic EEU-FR1H100B

Notes:

  • All capacitors are radial and have a lead spacing of 5mm.
  • C401, C402: Height should be 24mm or less to fit under the shielding.
  • C324, C334: Bipolar caps may enhance audio quality. I haven't tested that though.
  • You can use any fitting capacitors with the same capacity and the same (or higher) voltage.
  • Temperature rating should be 85°C or, even better, 105°C.