corrosion on the battery
A big problem that old computer systems have is leaking batteries.
The acid that gets free causes the copper conductors to corrode and when nothing is done the computer will stop working.
So yesterday I started to clean the damage caused by the leaking battery on my Amiga 500+.
First I opened my Amiga and completely disassembled it.
While doing this, I noted how the floppy drive power is connected.
Connecting it the wrong way will damage the drive beyond repair.
When the mainboard was out, I cut out the battery and then I cleaned all green corroded parts with concentraded lemon juice to neutralize the acid from the battery.
I then used a tooth brush to clean the affected parts and afterwards I dried the board and use pure alcohol to clean the part that I cleaned.
I still havened tested if she still works as I wanted to be sure that the mainboard is dried up.
Next step will be replacing the 7400 series chips that are corroded as I want to be sure that all corrosion is gone.
This Saturday I went to the Dutch Commodore club in Maarsen.
It was about 6 years ago that I visited the club for a very short visit.
I met a lot of people with the same interest as me, and had several good conversations.
On the club I noticed that Gideon (the creator of the 1541 Ultimate) was there with the prototype of the new 1541 Ultimate II+.
and a very interesting kernal selector based on a Atmel cpld chip.
The Commodore club is a place where other 8-bit computers like Atari and TRS-80.
If you are in the Netherlands on the third Saturday in the neighborhood of Maarsen (near Utrecht), it will be worth visiting their meeting.
This weekend, I created a XUM1541 interface base on an Arduino ProMicro board.
The interface allows me to talk to a commodore drive on my (32-bit windows) PC.
Now I’m able to quickly copy files over from my pc to floppy without having to use my 1541 Ultimate-II.
See the page on my site on how to build the Interface.
A little update on what I’m doing last weeks.
Last weekend I bought 2 pair of new drawers for in my IKEA EXPEDIT cupboard.
(Actually the drawers are part of the IKEA KALLAX series but can also be used in the former EXPEDIT series.)
I’m decorating my attic into a hobby space and needed some storage for my 5,25″ discs and couldn’t find any disc boxes that were in good condition and similar to each other.
Beside decorating my attic I also created two kernal switches.
One of the two are for my Commodore 128 and the other is for someone of the Dutch Commodore forum.
I still need to add the part for the integral disc and I have to find out why some changes I created on the kernal won’t work.
The changes I made worked in the vice emulator, but won’t in the real thing.
I changed the way the C= key worked while starting up (hold the C= to go into C128 mode instead the other way around).
I was building a list of LCD monitors that were able display the 15 kHz images by searching on the internet.
I wanted to place the list on my website, but last week I bought a LCD monitor that should support the 15 kHz.
After testing it at home, I got the message that it did not support the frequency.
The monitor I bought was a Samsung Syncmaster 710N.
So I decided that I won’t publish the list.
Yesterday some new parts arrived.
The mail man brought me a package with an internal 1571 drive and big power/drive activity led from a Commodore 128 D.
With this drive I can restore one of my Commodore 128 D computers that is missing the metal shields from the drive interface and the drive led.
Internal drive Commodore 128 and big leds
I wish everyone a happy 2016.
may you all enjoy another year in good health and lots of (computer) fun.
Last couple of weeks I was busy celebrating Christmas and did some researching, mainly autoconfig/autoboot rom of the Amiga Zorro II expansion port.
I also almost bought a A590 Hard disk controller, but the day I was going to get it, the guy sold it to someone else.
So if you have one for sale, please let me know.
I was already thinking of upgrading it (GURU rom, DMAC version 2).
I was also busy with my kernal switch project for my Compucase D64 and SX64, it will contain a xc9572xl that can be controlled by writing values to a certain memory location.
And maybe you already seen it, but I also added some info on mainboards.
I don’t own a monitor for my Amiga, so I wanted to connect her to a VGA (lcd) monitor/TV.
I tried several way to get this done, but so far I didn’t got it to work.
Only the composite output of the Amiga was working, but I wanted to have a color image.
So I tried a Amiga to scart cable, but my TV didn’t accept the signal.
Next I tried a Amiga to VGA cable, but this also didn’t work (none of my LCD monitors accepts a 15 kHz video signal.
I looked for another lcd, but I couldn’t find one, so I ordered a GBS8200 video converter on ebay and created a simple Amiga to VGA cable that I could hook up to the GBS8200, The GBS8200 then is connected to a VGA monitor.
For the cable I took an old VGA cable and cut it in halve.
Then I connected the R,G,B,C-sync and GNG to the 23-pin Amiga video connector.
This gave me a reasonable image on my lcd monitor.
Only I had some random white pixels on my screen.
I found on the internet that this had to do with the speed of the dram chip used on the GBS8200.
Maybe I will fix it later, but for now I’m happy.
Today I fixed the Amiga that was smoking.
Last week al parts arrived so I could fix her.
The capacitors are for a higher voltage and therefore a little bigger that the ones I removed.
After fixing I turned on the Amiga and she gave the kickstart boot image again.
In the top of the picture you can see the connector of my Amiga to scart cable.
But my TV is not accepting this input so I’m still stuck with a gray scale image on my TV.
I also received a GBS8200 board last week, so I can start building another Amiga -> GBS8200 -> VGA adapter.
I will create a post about this, when done
Today I received a Vic-20 cartridge I bought from on the internet.
The Speed Math/Bingo Math (VIC-1933) Cart.
A nice addition to my collection.