I finally got the last part that was missing from the BOM from a seller in Germany so that I could finish my Amiga 4000T motherboard replica build.

The motherboard is fully built, so is the AV module, the disk module and the ATX I/O module.

Unfortunately I do not have any AT PSUs anymore. I have ordered an AT to ATX converter, hopefully I can test the board once it arrives next week.

Looking back at building the Amiga 4000T

I think this build was fairly easy. The most difficult thing was locating parts on the PCB, thankfully there is an Ibom for both the main board and the modules here. If there was no Ibom, I honestly dont know how I would placed some of the components as placement can differ from Commodore made PCBs. You can not just compare part placement on pictures.

I will go through the build in more detail when I have tested the board fully.

I am happy to say that my A4000T build is soon finished. I am waiting for some pinstrips and a couple of passives I missed out on in my first order of components. When I get them I will proceed with the video and Zorro slots and also the three ISA slots (and the P8P9 power connector).

I am always nervous when soldering the 200 pin KEL CPU card connector. If you do it wrong side, you have to desolder it and turn it around – that is a lot of work. Better option is to triple check everything before soldering.

The backside of the A4000T PCB contains a lot of passives to solder on. All passives are 1206 though installation went fairly smoothly.

All thats left to do is to solder in the pin strips, 72-pin SIMM sockets, P8P9 socket, edge card slots and some small parts and then I will clean up the bord, inspect everything twice and do a test run with Diagrom. You can be sure I will post about it here!

I am building an Amiga 4000T motherboard and its modules at the moment. Here is the disk module for the A4000T. It is almost fully built, missing two double row pin headers and screws for the external SCSI2 port.

The disk module has the internal 50 pin SCSI port and the external SCSI2 port. It also has the SCSI switches (accessible from backside) and floppy port. It is attached to the Amiga 4000T motherboard on a pin header.

Work continues on my Amiga 4000T replica build. On the A4000T a lot of functionality is placed on daughter cards such as audio and video out that is placed on the AV module. The A4000T AV module slots into the Amiga 4000T motherboard in a 40 pin 20 x 2 double row 2.54 mm pin header.

As you can see on the image above, the AV module is about 95% done. It is missing the headphone jack, 20 x 2 double row female connector and two 3904 transistors (and some jumpers).