Amiga Thread.


TrashyMG

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I got early access by Steve Jones to order an A600/A1200 back panel for my Checkmate A1500+ case. Now hopefully I can continue that project and put my A600 in a better home. Also picked up this to put my PCMCIA ethernet card at a better angle and out of the way of the side of the case.

 
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ClockworkCoder

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Well, finally GadgetUK164 has uploaded the video fixing my Amiga1200 (issues mentioned in this thread), and he's done a fantastic job!


He didn't really discuss the Gotek, but the clicking is (obviously) the piezzo speaker emulating the disk drive. I later realised that it doesn't fit right as the Gotek has the front panel where the original Amiga's internal drive lacks one, so it is pushed back a couple of mm. I managed to fix it "properly" with cable ties, which looks surprisingly neat (when you actually look for it), and holds it securely in a good position.

Also, as I've mentioned in this thread - it's probably not a good idea to attempt surface-mount soldering for the very first time on a project like this. He's kind about my soldering, although does remark at one point "that is awful!" about one of my solder joints. I also didn't know what to do about the green / corrosion, and glad that he got that sorted. Didn't think after replacing them that it could still cause a problem. I wasn't even aware that any of the caps had originally leaked, as to my amateur eyes, they looked fine.

The keyboard connector was something that I had attempted to remove, and failed, only to attempt to get closer to the capacitors. Unfortunately I now have Kapton tape and a little more knowledge - something I would have liked to have known before I started. D'oh!

Anyway, I really recommend his channel. Thorough and precise - even if the fault I had was intermittent, and I think it took him quite a while before finding the issue. I also was completely oblivious to the sound issue he mentioned, and it's shame that wasn't captured on video.
 

rSl

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cool that your gorgeous a1200 works again!
this was an interesting watch. as a solder noob, i can say that, once the green stuff has gone, most of the solder joints looked done nicely to me.
learned that it's really important to have a good zooming cam to see all the microscopic small nastynesses.
GadgetUK164 has done a really great job with lots of wisdom and love, awesome!
and cool that you donated an a500 to him. will watch a future video starring this machine for sure.

amiga <3!!!
 
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TrashyMG

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Finally got to finish my CheckMate A1500 build with my A600 as I got the back panel and power supply converter. I eventually want to get the OMAP5 Devboard in there, but I need to think through a few problems with doing so.

For switching the A600 into a desktop I needed to get a SUMs USB keyboard adapter Fits over the U7 chip, which I believe acts as the CIA chips in other Amigas.
http://amigaonthelake.com/the-sum-a600-keyboard-adapter/

I 3D printed a bracket for the USB keyboard port and decided to add a place to hold a USB Blaster used to program the Vampire if the normal method doesn't work or program alpha/experimental cores that are sometimes released.

I'm using a GBS 8200 Video to VGA adapter scalar/converter board, I fitted an old PC expansion slot to the VGA output connector and it works perfect to hold it in place. I needed to make a special video input as the RGB is coming from the DB-23 Video output, I hacked up an old DB-25 cable and shaved it down with a rotary tool, fitted a 5-pin DIN to pass the RGB/Sync connections into the input of the GBS 8200's internal connector. Not quite the most elegant solution, but I figured it was better than trying to fish a cable through an expansion slot as there was a DIN connector hole in the back panel already for an optional keyboard connector with the checkmate case. I've also created buttons for the GBS 8200 in the front, with a quick disconnect.

Outside some custom wiring needed for the LEDs and such, bought some DB-9 panel mount extenders to have the two joystick/mouse ports that are on the side of the board to the back like an A500/A1200 has it. I think it came out alright.


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ClockworkCoder

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Ooh, just saw this... hope it happens (mechanical keyboard replacement). I've had no end of nightmares with the keyboard ribbon, and cherry mx switches would be sweet.


Incidentally, I've had a few issues (now fixed) with an expansion on the A1200. Found out that, apparently, some motherboards have nicely chamfered edges where an adapter goes, while mine had rough/sharp edges. When I installed the expansion, it was snagging on the pins of the connector on the adapter, and pushed them back inside the connector preventing it from working. In the end I had to file down the edges of the motherboard connector to make them rounded and smooth. Now (with a replacement adapter) it's working :) Expensive lesson though...
 

TrashyMG

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Honestly I'm still waiting for the replacement keycaps from A1200.net that I backed in 2017... While I do understand the delays in that Kickstarter campaign, but I'm still a bit hesitant on supporting anything from them until I get those...
 
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