Wednesday, January 1, 2020

Amiga collection is growing - A1200 added

As mentioned in my previous post, I managed to secure an Amiga 1200 and 500 through a Gumtree seller.  The A1200 Rev 1.D1 cost $200 and was an original purchase by the previous owner as was the A500 Rev 6a with a genuine A501 expansion that cost me $20 (it had a non working keyboard)….and 208 various Amiga magazines with cover disks.  I felt like a kid in a lolly shop..All my Christmas' come at once.

I've swapped the Rev 6a A500 mobo into my A500 that was running a modified Rev 5 board and it is now one sweet machine.  I had to pull the Varta battery from the A501 as it had leaked a little and corroded a small section of the board. I replaced the Varta with a home brew button cell and diode to prevent the charging circuit from trying to charge the lithium cell.

I spent a good 3 hours re-capping the A1200 yesterday as it had never been done according to the previous owner.  Again, I think I caught this in the nick of time as a few of the caps had leaked but I was able to clean up fairly easily.

The picture below shows the worst of the leaks before cleanup.




































I gave the A1200 a test run last night and I'm pleased to say that it works a treat.  I threw an old 20GB IBM laptop drive that I found in my stash of old bits and installed Workbench 3 and happy days, it passed all tests that I threw at it.

I have a CF adapter on the way that will take the place of the HDD and also some physical 3.1.4 ROMs that will take the pain out of HDD management

I will order an Individual Computers accelerator card when funds are available and also a Flicker Fixer (likely to be a MK3 according to Jens as there are no more MK2s left for sale).

Wednesday, December 18, 2019

A new member of the family coming soon

I managed to secure an A1200 HD without the HD last night.  Apparently boots okay and has workbench disks, mouse and PSU.  Super excited to pick this up on Saturday.
Also picking up an A500 for $20 that boots okay but has non working keys.  Should be fine for spares if nothing else.  I may get the keyboard sorted and add a Keyrah to make a Pi based Amiga, or buy another De-10nano and use MisTer.  The MisTer cores are really shaping up well with AGA Spec machine running faster than an A4000.

Sunday, December 8, 2019

Using a PC 1.44MB Floppy as an internal Amiga Drive - Mitsumi D359M3

Modifications required to allow a Mitsumi D359M3 Floppy drive to be used as an Amiga internal floppy drive.

Move jumper from DEN3 to DEN2 to enable disk-change on Pin2 of the connector

Cut trace from Pin 34 leading to the IC in the centre of the board

Connect the right side of DEN3 to Pin 34

To change the drive to D0 instead of D1 that is the default for PC floppy drives - Cut trace leading to Pin 12 and connect it to Pin 10 instead.

Something I've considered trying is leaving this set to D1 and using the drive externally as DF1:..A project for another day

https://1drv.ms/u/s!Ah5QQLH04HkRodxDvuxIAuWBiWzSgA?e=yRo6Uu
Click for a larger image