Tuesday, 28 August 2018

Amiga 500 updates

As readers will know, I bought a replacement Amiga 500 recently, and have started migrating my upgrades from the non-working A500 to the "new" one.



This meant breaking the original seal on this Amiga 500 to take a look inside. All things considered and considering it's age, not too bad. Bit of rusting on the top metal shield, but I don't intend to keep that in place anyway.


Removing the shield, here is the Amiga 500 board laid bare, with the 512k memory expansion card I got from AmigaStore.eu:


Looking at the revision information on the board reveals this is a Revision 7 board.


On my non-working A500, I previously installed a gotek floppy emulator board with a 3D printed case designed to fit the Amiga floppy opening without any modifications needed to the case:


Here it is installed in place of the original internal floppy disk drive:


Next, I focused my attention to the Even CIA chip, which needs to be removed to install the DF0 selector hardware switch, with the even CIA chip then placed on top of it.


By doing this, I can still boot real Amiga floppy disks using the external floppy drive by flicking the DF0 selector switch to use the external floppy drive port as DF0, rather than the internal floppy drive (now the Gotek).

I tested this using a Workbench 1.3 floppy disk in the external floppy drive with the DF0 selector set to use the external floppy port as DF0 and it worked perfectly:


I then installed the USB stick into the internal Gotek floppy drive, and switched the DF0 selector back to the internal floppy drive. I could then test important stuff works using the gotek, like demos for example:



For those not familiar with the Gotek, it is a floppy drive emulator connected to the floppy drive connector, and can boot Amiga .ADF floppy disk image files from USB stick.

You can select the floppy disks by booting the included selector.adf floppy disk image (set up to use position 000 on the Gotek).

When booted the selector software boots up and allows you to associate gotek display numbers to specific Amiga .ADF disk files, as below:


The annoying bit is you need to take a photo of the screen showing the mappings, since you almost certainly won't remember which number is which later on and need it to know which number to select on the Gotek...


With the Amiga 500 case on, you can see the gotek snugly fits in the floppy drive space without any modifications to the case. It makes me sad to see people cut up the floppy drive opening to fit the gotek in. It looks awful and it prevents installing a real floppy drive if wanted again later on. This solution is much neater in my opinion:


You can insert the usb stick and press the buttons from outside the case to select the floppy disk image number without a problem. Time for more demos! Time for "Sunglasses at night" :-)



Up until now I have been using the AmiVGA RGB to VGA converter plug and my 15khz compatible TFT display.


But now I have installed my Indivision ECS from the old Amiga 500, which gives me a scan doubled de-interlaced VGA output that I can use on my standard TFT screens (normally I use with my A4000T), so I hooked them up. (photo taken from the old Amiga 500 - but the setup is exactly the same)


I also connected my ACA500 expansion card on the left side of the Amiga 500, with an Amiga 1200 A1233 030 33Mhz accelerator from Individual Computers plugged into the A1200 accelerator board slot on the ACA500. This gives me 030 acceleration, twin CF 4GB hard disk support and 128MB of FastRAM from the accelerator!


Alternate view of the ACA500 with the casing (photo taken from the old Amiga 500):


With the casing back on, things are looking great!


The ACA500 also gives me softkick 1.3/3.1 boot support in it's memory without the need to swap the kickstart roms onboard the A500. I can boot in 1.3 or 3.1 mode from a boot selection menu on power up, with plenty of customisation options for the settings for those boots.

I also installed the Subway USB into the ACA500 casing (small space available within the casing next to the A1200 accelerator to fit it exactly!), connected to the A1200 clock port connector on the ACA500. This gives me USB support on my Amiga 500 hard disk setup as well! (sorry I didn't grab a photo of the Subway USB installation)


I also connected the Rys II USB mouse adapter to the A500 so I can use a standard USB mouse with the Amiga (no driver needed) and avoid a mouse pad and regularly cleaning the mouse ball on a real Amiga mouse. At the moment I use a spare USB mouse from my AmigaOne X1000!

I bought the recently released OCS game called Worthy, and put the ADF onto my Gotek to try it out on the Amiga 500. It is a very nice game indeed. I would love to see more new games for the Amiga.


The graphics are classic Amiga, very pretty, good sound and the gameplay is fun too!


For now my Amiga 500 is where I want it to be upgrade-wise. I could install the Vampire 500 V2 into it, but as regular readers know, that is how I ended up with a non-functional Amiga 500 in the first place. I am happy with it at this point. I will leave well enough alone this time!

I am giving thought to putting the Vampire 500V2 back into the A2000HD with a CPU slot adapter to solve the previous problem of it being unreliable on the A2000 68000 slot (popping off on cool down needing the case and internal floppy drive frame assembly to be removed every time I powered on). I have recently picked up a CPU slot adapter for this purpose. A likely future project when I have free time for it.


3 comments:

  1. So, did you figure out what is broken in the othe A500 mainboard?

    ReplyDelete
  2. wow, a rev 7 is pretty damn rare and special.

    If you get some time, could you please take some hi-res photos of the front and back of the board and submit them to bboah and amiga.resource.cx?

    Great find!

    ReplyDelete