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Forum: support.Hardware 27 August 2014, 06:15
Replies: 6
Views: 1,578
Posted By TomCrazy
Very nice repair lab! Let's see if I can get...

Very nice repair lab!

Let's see if I can get any of this right.
Starting from the shelf at the cabels, from left to right:
A 4 ch HP oscilloscope with CRT screen, a benchtop multimeter and a...
Forum: support.Hardware 27 August 2014, 05:51
Replies: 13
Views: 1,952
Posted By TomCrazy
First of all, you should try to find out whether...

First of all, you should try to find out whether or not you got any sound output at the back of the Amiga. Ordinary RCA jacks are used for the analog stereo sound output, and you can hook up any kind...
Forum: support.Hardware 02 June 2014, 23:36
Replies: 23
Views: 4,723
Posted By TomCrazy
Pinball Dreams is another interesting game to...

Pinball Dreams is another interesting game to try. I don't know if this applies to the cracked version though. I think it was the original that I noticed this with if I don't remember it wrong.
What...
Forum: support.Hardware 23 May 2014, 08:47
Replies: 7
Views: 1,260
Posted By TomCrazy
Test the same Amiga motherboard with another...

Test the same Amiga motherboard with another mouse (not joystick) in the same port. The 9 pin Dsub has different pins for joystick and mouse, so just testing with a joystick is not reliable. You need...
Forum: support.Hardware 27 December 2013, 05:33
Replies: 63
Views: 8,066
Posted By TomCrazy
@Nostromo I very much suspect a mechanical...

@Nostromo
I very much suspect a mechanical problem, probably something that has to do with a glitchy step motor to heads-connection, a badly aligned track zero detector, badly aligned head(s), or...
Forum: support.Hardware 16 December 2013, 06:48
Replies: 31
Views: 3,497
Posted By TomCrazy
It seems like you have misunderstood a bit how OP...

It seems like you have misunderstood a bit how OP amps work. Demolition has already provided a quite good explanation here, but let me try to clearify it for you even further.

First of all, an...
Forum: support.Hardware 13 November 2013, 01:30
Replies: 20
Views: 4,298
Posted By TomCrazy
You are right in that xcopy and trackloaded games...

You are right in that xcopy and trackloaded games won't work without a ready signal. And yes, the diode hack will make trackloaded games and xcopy work. However, it can also result in problems during...
Forum: support.Hardware 12 November 2013, 15:28
Replies: 20
Views: 4,298
Posted By TomCrazy
@ThEcRoW The diode hack is exactly like Sandro...

@ThEcRoW
The diode hack is exactly like Sandro has showed in the picture.

@Sandro
I find it rather amusing that you claim that I don't know what I'm talking about. By doing so, you are yourself...
Forum: support.Hardware 10 November 2013, 20:41
Replies: 20
Views: 4,298
Posted By TomCrazy
@Jope Then these drives must be configured in a...

@Jope
Then these drives must be configured in a way which requires both the HD switch and the disk detector switch to be released at the same time for the latched "disk-in-drive" signal to reset...
Forum: support.Hardware 10 November 2013, 20:13
Replies: 17
Views: 6,215
Posted By TomCrazy
The VSYNC (pin 12 Amiga side) is going into pin...

The VSYNC (pin 12 Amiga side) is going into pin 15 on the VGA connector in the diagram, although it should go to pin 14. But I suppose you hooked up the wires correctly when making the cable or you...
Forum: support.Hardware 10 November 2013, 02:50
Replies: 17
Views: 6,215
Posted By TomCrazy
A basic rule of thumb for successful electronic...

A basic rule of thumb for successful electronic troubleshooting is to always start off by checking the supply voltage(s) at a certain suspected active device.
Start off by checking the 5V supply...
Forum: support.Hardware 09 November 2013, 23:17
Replies: 20
Views: 4,298
Posted By TomCrazy
The diode hack is a terrible modification that...

The diode hack is a terrible modification that should not be applied to any floppy disk drive. Performing the diode hack is like asking for trouble. That hack is probably invented by someone who...
Forum: support.Hardware 08 November 2013, 23:26
Replies: 20
Views: 4,298
Posted By TomCrazy
There are floppy cables out there you can get...

There are floppy cables out there you can get from ebay and other places, so why would you want to do this without damaging the cable?

I didn't want to make any modifications to my original Amiga...
Forum: support.Hardware 08 November 2013, 23:05
Replies: 3
Views: 714
Posted By TomCrazy
Check the 5V supply pin (pin 7) at the mouse/joy...

Check the 5V supply pin (pin 7) at the mouse/joy ports on the Amiga with a multimeter.
A power failure on this pin will make the joysticks and left and right mouse buttons work, but not the mouse...
Forum: support.Hardware 06 November 2013, 06:43
Replies: 20
Views: 4,477
Posted By TomCrazy
Then, start by desoldering and replacing C211,...

Then, start by desoldering and replacing C211, C212 and C213. I've repaired several motherboards with failing ceramic capacitor before. Failing ceramics is not as uncommon as one might think.
...
Forum: support.Hardware 05 November 2013, 17:35
Replies: 20
Views: 4,477
Posted By TomCrazy
Try hooking it up via composite video and report...

Try hooking it up via composite video and report back to us after that. Check for any similarities in the way the picture is distorted when comparing composite and RGB.
Forum: support.Hardware 05 November 2013, 13:16
Replies: 20
Views: 4,477
Posted By TomCrazy
The problem might show up through composite too,...

The problem might show up through composite too, but not necessarily. The A600 has the RGB signals buffered through the video encoder which then goes to some driver transistors which drives the RGB...
Forum: support.Hardware 01 September 2013, 03:53
Replies: 39
Views: 6,901
Posted By TomCrazy
In addition to what Stedy points out, I would...

In addition to what Stedy points out, I would like to address another reason to why it's not a good idea to supply power to the floppy disk drive connector.

The A1200 motherboard has inductors,...
Forum: Looking for a game name ? 19 August 2013, 18:05
Replies: 4
Views: 1,065
Posted By TomCrazy
@s2325 Thanks, it was interesting to have a...

@s2325
Thanks, it was interesting to have a look at that webpage. I have now been going through the whole list of fighting games on that list, but I couldn't find any screenshots that are...
Forum: Looking for a game name ? 19 August 2013, 17:37
Replies: 4
Views: 1,065
Posted By TomCrazy
A shaolin game

This is something I remembered playing on the A500 when I was a kid. For years I have been trying to figure out the title of this game, but have still not managed to do so.

It's a kind of shaolin...
Forum: support.Hardware 19 August 2013, 17:02
Replies: 17
Views: 6,054
Posted By TomCrazy
Like others have written here, it's not worth...

Like others have written here, it's not worth going through all the trouble of building a USB to DB9 converter.
USB uses a kind of serial protocol, while you could say that the DB9 on the Amiga...
Forum: support.Hardware 11 August 2013, 03:31
Replies: 57
Views: 5,098
Posted By TomCrazy
I would like to correct myself here. It was a...

I would like to correct myself here. It was a while since I tested this disk drive on my A1200, but when thinking it through I realized that this is not entirely correct.

"Escom" PC drives are...
Forum: support.Hardware 06 August 2013, 23:41
Replies: 13
Views: 1,739
Posted By TomCrazy
Just out of curiousity, how come you have such...

Just out of curiousity, how come you have such high desire to replace a PLCC chip on an Amiga motherboard that you are going through the trouble of actually finding a faulty board on ebay in order to...
Forum: support.Hardware 06 August 2013, 21:11
Replies: 57
Views: 5,098
Posted By TomCrazy
Yes, you disable the CPU cache in the early...

Yes, you disable the CPU cache in the early startup menu. I'm sure you will find it quickly if you have a look around in the menu. It's hard to miss it. :)

Before trying to load old games, you...
Forum: support.Hardware 06 August 2013, 19:25
Replies: 57
Views: 5,098
Posted By TomCrazy
@ElectroBlaster I have the very same drive at...

@ElectroBlaster
I have the very same drive at home and yep, I can confirm that it's a PC drive that has been slightly modified to work on Amiga. However, the way it's modified at factory (or the...
Forum: support.Hardware 06 August 2013, 18:28
Replies: 57
Views: 5,098
Posted By TomCrazy
@Trydowave Here, maybe this can help you: ...

@Trydowave
Here, maybe this can help you:
http://www.youtube.com/watch?v=CGMPS-QAigs

Also, I'm wondering about the scratch that can be seen close to R512 in this photo:...
Forum: support.Hardware 05 August 2013, 20:46
Replies: 57
Views: 5,098
Posted By TomCrazy
Regarding being able to format a floppy or at...

Regarding being able to format a floppy or at least getting some kind of response from the floppy drive... That is very much true, but only under the condition that the motherboard is of C= type and...
Forum: support.Hardware 04 August 2013, 06:35
Replies: 13
Views: 1,739
Posted By TomCrazy
@GadgetUK It seems to me that several sellers...

@GadgetUK
It seems to me that several sellers on ebay are selling items as "not working" or "untested", when it in fact is working without any problems at all. I guess some people are selling things...
Forum: support.Hardware 04 August 2013, 06:22
Replies: 57
Views: 5,098
Posted By TomCrazy
@trydowave Ok, here is my conclusion after...

@trydowave
Ok, here is my conclusion after watching the pictures:

The case for that A1200 is an Escom case (or so it seems), but the motherboard is not very likely to come from Escom since it's a...
Forum: support.Hardware 03 August 2013, 08:56
Replies: 13
Views: 1,739
Posted By TomCrazy
@GadgetUK Do you only have these problems with...

@GadgetUK
Do you only have these problems with a certain Dizzy game? If so, have you tested what happens when you boot up the same game on another A1200?

Also, have you tested to start a program...
Forum: support.Hardware 03 August 2013, 07:58
Replies: 10
Views: 4,079
Posted By TomCrazy
@magnox I made a video about the Escom floppy...

@magnox
I made a video about the Escom floppy fix a little while back. It's exactly the same thing as kipper2k demonstrated in his picture, but maybe it will be even more clear for you what you have...
Forum: support.Hardware 01 August 2013, 03:07
Replies: 5
Views: 894
Posted By TomCrazy
Like Roy points out, it's more likely to be...

Like Roy points out, it's more likely to be something wrong with the analog side of things rather than Paula or something earlier in the chain. A blown Paula is not at all as common fault as a...
Forum: support.Hardware 01 August 2013, 02:35
Replies: 11
Views: 1,686
Posted By TomCrazy
I think I know exactly what kind of sound your...

I think I know exactly what kind of sound your floppy drive is making. It's from the spindle motor of the floppy drive turning off and on very quickly.

There is obviously something wrong with the...
Forum: support.Hardware 23 July 2013, 23:29
Replies: 2
Views: 951
Posted By TomCrazy
I think this is a really great post which can...

I think this is a really great post which can help a lot of people with their troubleshooting.
I would seriously have considered making this a sticky if I was a moderator. Lots of useful information...
Forum: support.Hardware 23 July 2013, 10:45
Replies: 15
Views: 2,077
Posted By TomCrazy
TOM'S BASIC 64 KB FREE MEM REM You should...

TOM'S BASIC
64 KB FREE MEM

REM You should never remove chips at random without being
REM quite sure which chip is wrong. Too much trial-and-error will just
REM give you a lot of unnecessary...
Forum: support.Hardware 23 July 2013, 08:17
Replies: 21
Views: 4,806
Posted By TomCrazy
@ShK There is no such thing as a maximum ESR...

@ShK
There is no such thing as a maximum ESR value. The general rule of thumb is simply; The lower the ESR, the better.

An ideal capacitor consists only of capacitance and nothing else. However,...
Forum: support.Hardware 21 July 2013, 08:33
Replies: 21
Views: 4,806
Posted By TomCrazy
Possible - Yes Could you elaborate on...

Possible - Yes


Could you elaborate on this a bit? I'm not quite sure what you mean here.
Putting more capacitance in there will not increase the power going into your motherboard. Power is a...
Forum: support.Hardware 21 July 2013, 03:28
Replies: 6
Views: 1,782
Posted By TomCrazy
I don't blame you for almost not believing me,...

I don't blame you for almost not believing me, but I can ensure you that what I have written in my original post is very much true. If it wasn't, I would have no reason to bring up this topic.
And...
Forum: support.Hardware 18 July 2013, 22:03
Replies: 6
Views: 1,782
Posted By TomCrazy
A1200 rev 1B notorious for going bad?

Hey all!

I'm currently in the middle of repairing an A1200 rev 1B motherboard. What I first thought would be a quick and easy repair (like e.g. replacing a capacitor and that's it) turned out to...
Forum: support.Hardware 18 July 2013, 21:29
Replies: 17
Views: 3,324
Posted By TomCrazy
@jimbob I don't know which datasheet you...

@jimbob

I don't know which datasheet you were looking at, but the one I have does not show the same BPF between PAL and NTSC.

For NTSC mode:
BPF H287BSJS-3108HWD
DL ELB-4L068

For PAL...
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