English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 621
Search took 0.05 seconds.
Search: Posts Made By: jimbob
Forum: support.Hardware 26 March 2018, 19:57
Replies: 0
Views: 131
Posted By jimbob
A1200 Rev1A, NTSC switch?

Hello, can any anyone tell me if this photo shows something normal for a rev1A A1200.

Q201 is in the NTSC/PAL switch circuit of the video encoder but has been left out here and the pads jumpered...
Forum: support.Hardware 14 March 2018, 00:50
Replies: 4
Views: 291
Posted By jimbob
Audio circuit has a +ve and -ve power supply....

Audio circuit has a +ve and -ve power supply. C304 is probably correct as you have it, plus terminal to ground and minus terminal to -ve supply.

Don't take my word for it though, check the...
Forum: request.Apps 03 March 2018, 16:50
Replies: 2
Views: 401
Posted By jimbob
ADF in the zone. Mine is badged differently but...

ADF in the zone. Mine is badged differently but looks like the same device.
Forum: Retrogaming General Discussion 07 August 2017, 21:26
Replies: 43
Views: 2,960
Posted By jimbob
Mine has a not too shabby at all really mono...

Mine has a not too shabby at all really mono input and single speaker. I guess most of the Sony ones are the same. Fine for A600/A1200/CD32 with a single connector and ok for A500 with a simple...
Forum: support.Hardware 01 August 2017, 22:41
Replies: 10
Views: 858
Posted By jimbob
That is good news, a fault which goes away after...

That is good news, a fault which goes away after some time when powered up is a good sign of very tired capacitor(s). You may or may not have already got the main culprit, but either way a full recap...
Forum: support.Hardware 30 July 2017, 11:11
Replies: 10
Views: 858
Posted By jimbob
Yes, make sure the cable is good first, next load...

Yes, make sure the cable is good first, next load up a paint program program or just the workbench palette editor and play with the RGB sliders. This should tell you if the green signal is totally...
Forum: Coders. Asm / Hardware 26 May 2017, 20:02
Replies: 14
Views: 1,245
Posted By jimbob
Anyone know how the software switch for the audio...

Anyone know how the software switch for the audio filter works, and is it different on different models?

Reason being, whilst running the Sanity Arte demo on an A1200, I pressed and held the right...
Forum: support.Hardware 21 May 2017, 00:45
Replies: 12
Views: 656
Posted By jimbob
PM me your address and I'll stick one in the post...

PM me your address and I'll stick one in the post for you.

I'm a bit surprised that the cap value just drifting by that amount caused the gross fault you had. Did you measure it's DC resistance...
Forum: support.Hardware 14 May 2017, 12:04
Replies: 10
Views: 676
Posted By jimbob
Not sure about that 2.9V, I had the number 2.1V...

Not sure about that 2.9V, I had the number 2.1V in my mind but I'd have to check.

I'd be about 80% sure you have a faulty U12 at this point. Before replacing it though , you should check the...
Forum: support.Hardware 12 May 2017, 23:46
Replies: 10
Views: 676
Posted By jimbob
I think wonky references to the video encoder...

I think wonky references to the video encoder could cause this. Check carefully the circuits to pin 13 and 14 of U12. Double check your replacement C459 and C460.

From memory Vref on pin14 should...
Forum: support.Hardware 01 March 2017, 22:08
Replies: 12
Views: 996
Posted By jimbob
Generally just live with it but I did try a...

Generally just live with it but I did try a proper repair on my main A600. Light brass plate/foil, the heaviest guage than you can shape easily enough, epoxy glue and clamp the snapped pieces back in...
Forum: support.Hardware 03 February 2017, 19:01
Replies: 22
Views: 1,739
Posted By jimbob
This could just be a faulty switching jack on the...

This could just be a faulty switching jack on the left channel, may just need cleaned if you are lucky. If you're unlucky the caps have eaten a trace. Mixing the channels when only one cable is...
Forum: Retrogaming General Discussion 30 January 2017, 20:57
Replies: 13
Views: 1,480
Posted By jimbob
Haha, seems that I cannot read! I thought you...

Haha, seems that I cannot read! I thought you were talking about Heimdall 2.
Forum: Retrogaming General Discussion 30 January 2017, 20:31
Replies: 13
Views: 1,480
Posted By jimbob
Hrmm, there is a three part preview in The One....

Hrmm, there is a three part preview in The One. At the end of the third part they promise an exclusive demo level and a competition in the April 94 issue. There is a demo but I don't see the...
Forum: News 30 January 2017, 20:25
Replies: 7
Views: 1,971
Posted By jimbob
Is this a fact or speculation? I realise it's...

Is this a fact or speculation? I realise it's unlikely as the data is probably long lost and in an obscure format if it does exist, but what made me wonder was that the A1200 includes the internal...
Forum: News 30 January 2017, 00:00
Replies: 7
Views: 1,971
Posted By jimbob
amigapcb.org/

I don't know who made this but it was linked in a couple of threads and it is totally awesome and deserves a thread for recognition -

http://amigapcb.org/

Click the link to the beta for more...
Forum: support.Hardware 29 January 2017, 23:52
Replies: 7
Views: 735
Posted By jimbob
Have to leave this one aside for the moment. ...

Have to leave this one aside for the moment.

Freezer spray made no difference once the machine is up and running. I'm not gonna try using it on cold boots as the fault is not 100% repeatable and...
Forum: Retrogaming General Discussion 29 January 2017, 23:49
Replies: 13
Views: 1,480
Posted By jimbob
This rings a faint bell to me but I could be...

This rings a faint bell to me but I could be imagining it :crazy. Maybe The One or CU Amiga? Those were the mags I usually had.
Forum: support.Hardware 29 January 2017, 23:42
Replies: 11
Views: 1,295
Posted By jimbob
Not exactly true. Both these boards are rev8a...

Not exactly true. Both these boards are rev8a A500+, same code numbers for the artwork etc but as you can see the one on the right has the layout error corrected so the parts are inserted as per the...
Forum: support.Hardware 26 January 2017, 23:10
Replies: 7
Views: 735
Posted By jimbob
Thanks Zetr0, the solder side of this board looks...

Thanks Zetr0, the solder side of this board looks really good. Nothing to see under my normal magnifier but under my wee hand held microscope, it's hard to tell, then nearly every single joint has...
Forum: support.Hardware 26 January 2017, 02:06
Replies: 7
Views: 735
Posted By jimbob
PSU is not a standard Amiga one, it is an...

PSU is not a standard Amiga one, it is an industrial type thing I keep for testing. Works great on lots of other Amigas so I think it is solid.

I am thinking of changing the two main filter caps...
Forum: support.Hardware 26 January 2017, 01:10
Replies: 7
Views: 735
Posted By jimbob
A500, cold boot gurus?

I have almost fixed an A500 which came to me dead but it has a niggling fault remaining which I'd like to track down given the damage that had previously been done somehow.

First the symptoms -
...
Forum: support.Hardware 22 December 2016, 02:06
Replies: 13
Views: 1,154
Posted By jimbob
I would say it is normal to hear low level...

I would say it is normal to hear low level digital rubbish during many types of activity on the amiga, mouse movement, heavy screen updates, and particularily disk activity and it will be especially...
Forum: support.Hardware 07 December 2016, 02:35
Replies: 7
Views: 1,012
Posted By jimbob
Got the bastard! Turned out to be a ceramic...

Got the bastard! Turned out to be a ceramic decoupling cap at the video DAC. Freeze spray worked a treat, it was very obvious which component was cooking itself when it got a dose.

Everything...
Forum: support.Hardware 04 December 2016, 22:59
Replies: 7
Views: 1,012
Posted By jimbob
Had a good hunt for this and still no luck....

Had a good hunt for this and still no luck. Before I start lifting components one by one I might try this -

1. Something on the board is broken and gives ~20 ohms between 5v and ground.

2. 5V...
Forum: support.Hardware 04 December 2016, 22:46
Replies: 4
Views: 795
Posted By jimbob
If you haven't got them, great redrawn schematics...

If you haven't got them, great redrawn schematics are here -

http://www.amigawiki.de/doku.php?id=en:service:schematics

You'll want to look first at the the pages on Video out and Lisa.

As...
Forum: OT - Gaming 03 December 2016, 17:38
Replies: 693
Views: 101,692
Posted By jimbob
I have a GOG key for Shadowrun: Dragonfall -...

I have a GOG key for Shadowrun: Dragonfall - Director's Cut. PM if you want it.

EDIT: Taken.
Forum: support.Hardware 30 November 2016, 00:49
Replies: 7
Views: 1,012
Posted By jimbob
Good idea, hoped I would be able to at least...

Good idea, hoped I would be able to at least isolate an area of the board but I didn't manage to find any clues. I have an LCR meter which is a bit more accurate than my cheapo multimeter but I...
Forum: support.Hardware 28 November 2016, 21:50
Replies: 7
Views: 1,012
Posted By jimbob
Weird fault on A1200, how to find it?

I have an A1200 here which seemed to be working properly after a recap except the keyboard wasn't working. No keys worked and the caps lock light would flash three times every so often. I then...
Forum: support.Hardware 22 October 2016, 22:59
Replies: 6
Views: 652
Posted By jimbob
Is this a different diagnostic ROM from the one...

Is this a different diagnostic ROM from the one you have?

http://www.diagrom.com/

Looks very useful for a partially booting board. (oh, a new version announced as I posted -...
Forum: support.Hardware 24 September 2016, 16:11
Replies: 13
Views: 1,147
Posted By jimbob
I wouldn't bother with the piggy back chip RAM...

I wouldn't bother with the piggy back chip RAM mod. It would be different if 1MB cards were unavailable or it freed the connector for another use but as it is, not worth it.

It's a slightly tricky...
Forum: Nostalgia & memories 19 September 2016, 21:21
Replies: 30
Views: 4,115
Posted By jimbob
Galahad, you've been a naughty boy and must be...

Galahad, you've been a naughty boy and must be punished. We're gonna lock you up in the cupboard under the stairs. ;)
Forum: support.Hardware 18 September 2016, 23:53
Replies: 5
Views: 589
Posted By jimbob
I'm sure your right, proper grounding and it's...

I'm sure your right, proper grounding and it's potential problems are a bit mysterious to me.

Anyway, I wired it up properly this time and it works fine. There is a some slack inside the shell...
Forum: support.Hardware 13 September 2016, 19:45
Replies: 5
Views: 589
Posted By jimbob
Thanks fellows. Yes, I should have said I...

Thanks fellows. Yes, I should have said I "thought" it was properly secured!

I think I see what the problem was now. The U clamp was certainly tight enough on the outer cable but it can rotate...
Forum: support.Hardware 13 September 2016, 19:05
Replies: 5
Views: 710
Posted By jimbob
I thought this was normal for 3.1. It doesn't do...

I thought this was normal for 3.1. It doesn't do the shades of grey thing. Is that the only thing which doesn't work? Floppy boots ok?

Your display should detect a video signal at power on though,...
Forum: support.Hardware 12 September 2016, 23:48
Replies: 5
Views: 589
Posted By jimbob
Video cable, DB23 to BNC.

I'm after any tips on the correct way to wire up a cable from Amiga DB23 to 4x BNC for a Sony BVM monitor.

It was working great with the following connections but the connections to the solder...
Forum: support.Hardware 09 September 2016, 19:14
Replies: 13
Views: 1,147
Posted By jimbob
Check your board revision also. On Rev1 "A300"...

Check your board revision also. On Rev1 "A300" the pads are too small making removing and resoldering trickier. Later revs are much easier but only if you have the right tools, and flux, lots of...
Forum: support.Hardware 03 July 2016, 23:36
Replies: 11
Views: 1,295
Posted By jimbob
This is normal. Those 2 diodes etc are the...

This is normal. Those 2 diodes etc are the battery charging circuit. There must have been an error in the PCB layout because all 500+ have that diode soldered in that way.

The battery doesn't look...
Forum: Looking for a game name ? 13 June 2016, 20:47
Replies: 5
Views: 2,543
Posted By jimbob
Omega Race is the game you are looking for. I was...

Omega Race is the game you are looking for. I was trying hard to remember this myself a few years ago.

https://www.youtube.com/watch?v=FTKzPGTOwE0
http://amr.abime.net/issue_329_coverdisks
...
Forum: support.Hardware 29 May 2016, 15:36
Replies: 122
Views: 85,234
Posted By jimbob
Don't think that's correct, some keys including...

Don't think that's correct, some keys including CTRL,Aleft,Aright,return, maybe space and also shift keys have a line to themselves.
Showing results 1 to 40 of 621

 
Forum Jump

All times are GMT +2. The time now is 05:24.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Page generated in 0.09947 seconds with 10 queries