Hardware Repairs / 2018-10-17 08:01:57

Most Amiga hardware has now more than 20 years... so, yes, it is getting wiser but also needs some repairs. Here are some repairs and tips.

PS. Follow these tips at your own risks! I cannot (and won't) be responsible for any damage that you may cause!

Installing an ACA1230 or ACA1233

The ACA1230 and ACA1233 are accelerators for the A1200 from Individual Computers. They are modern and clean-built accelerators, using surface mounted components. They are without mobile parts (no fans!) and therefore totally silent... They are also plug-and-play!

The are actually very easy to install: just open up the trap door under the Amiga and gently slide them in, starting with the side with the "small connector" and twisting them straight to connect them tight. Then, close the trap, fire the Amiga, and enjoy!

Changing the Amiga PSU for a Modern, Standard ATX PSU

There are now lots of ATX PSU for sale for cheap in second-hand stores, which are in perfect conditions. They can be bought for less than $CA10 and used to effectively replace the old Amiga PSU with more power (watts) to support more extensions. There are a few steps to follow to use a ATX PSU:

1. Find a ATX PSU in good condition;
2. Use the paper-clip trick to get it to switch on:
   
   1. In the 20-pin block going out from the ATX PSU, find the green wire (there's only one);
   2. There are two black ground cables beside it, find one of them (no matter which one);
   3. Connect the green and black wires using a paper-clip, then isolate it using electric tape;
   4. Plug and switch on the ATX PSU (when on, its fan should turn, even if briefly);
3. Open the Amiga PSU and unsolder from the PSU the cable connecting to the Amiga;
4. Connect the unsoldered end of the Amiga cable to the 20-pin block from the ATX PSU as explained here or here or as follows:

5. Check carefully—twice!—the voltages between each pin of the Amiga connector, using a voltmeter. BEWARE of shortcuts!

6. Voilà ! You can now use your Amiga with a modern, standard—and powerful!—ATX PSU

Fixing a A4000 Motherboard with Damage due to a Leaking Battery

I would not recommend trying to fix damage due to a leaking battery at home! Trust experts, like AmigaKit, even then find that difficult! In particular because the leak damaged "through holes" and connection under the memory sockets . Here are some pictures of the step to fix the damage, courtesy of AmigaKit:

Connecting a Arananet and ENC28J60 module

The Vampire is an amazing card that really give a second life to the Amigas! It can be equipped with a combo Arananet+ENC28J60 module to provide an Ethernet port and access to the Internet . Usually, the Aranenet and the ENC28J60 module come separately, although I bought mine together from Relec (very nice and very fast!). So, the question can be: how should I plug these two neat pieces of hardware together? Thanks to XRay from Relec and guibrush from the ApolloTeam, here are some hints on how to answer that question!

Arananet Pins

My Arananet came with 12 pins and two soldered wires next to the 5V and GND pins. These two wires are connected to the 5V and GND pins!

5V   oo GND
     oo
     oo INT
SI   oo S0
CS   oo SCK
3,3V oo GND

ENC28J60 Module Pins

In theory, the pins of a ENC28J60 module are:

CLK  oo INT
WOL  oo S0
SI   oo SCK
CS   oo REST
VCC  oo GND

BUT, on my ENC28J60 module, the pins are as follows because there are two models of modules, with 10 or 12 pins!

5V   oo GND
INT  oo CLK
S0   oo WOL
SCK  oo SI
RST  oo CS
Q3   oo GND

Connections

Here a table showing the correspondance (hence, the connections) between the two:

Thanks XRay and guibrush!